We employed the previously developed micro porous activated carbon models of different pore sizes ranges of 9–11 Å, 10–12 Å, and 13–16 Å that were constructed by molecular simulation method based on a random packing of platelets of carbon sheets, functionalized with oxygen containing groups, to study the adsorption behavior of methane molecules. In studying methane adsorption behavior, we used Grand Canonical Monte Carlo and Molecular Dynamics methods at different temperatures of 273.15, 298.15 and 303.15 K. Adsorption isotherms, isosteric heats of adsorption, adsorption energy distributions and porosity changes of the models during adsorption process were analyzed and discussed. Furthermore, radial distribution Functions, relative distribution and diffusion coefficients of methane molecules in activated carbon models at different temperatures were studied. After the analysis, the main results indicated that large micro pores activated carbons were favorable for storing methane at lower temperatures and small micro pores were the most favorable for adsorbing methane molecules at higher temperatures. Interestingly, the developed model structures showed high capacities to store methane molecule at ambient temperatures and low pressure.

B₄C-SiC-TiB₂ ceramics were prepared by in situ reactive hot-pressing sintering with TiSi₂ as an additive. The reaction pathways of TiSi₂ and B₄C were investigated. The sintering was found to be a multi-step process. The reaction started at approximately 1 000 °C, and TiB₂ was formed first. Part of Si and C started to react at 1 300 °C, and the unreacted Si melted at 1 400 °C to form a liquid phase. TiSi₂ predominantly affected the intermediate sintering process of B₄C and increased the sintering rate. Due to the unique reaction process of TiSi₂ and B₄C, a large number of aggregates composed of SiC and TiB₂ were generated. The results showed that composite ceramics with the optimal flexural strength of 807 MPa, fracture toughness of 3.2 MPa·m^1/2, and hardness of 32 GPa, were obtained when the TiSi₂ content was 10 wt%.

Based on the analysis of different theory for glass tempering process, the “structural theory” with stress relaxation and structural relaxation effects was selected to investigate the tempering of flat glass quantificationally. The geometrical model with small size and non-homogeneous mesh were considered to build the finite element models according to the characteristics of stress field. The tempering process of flat glass with 12 mm thickness was calculated with the verified finite element model. The transient and permanent stress of the central area, edge and corner end of the flat glass are obtained and analyzed. From the calculation results of basic case, the transient tensile stress at the upper surface of the central area, the center point of edge, the edge of edge, the edge of corner were 14.30,18.94, 40.76 and 34.75 MPa, respectively. The transient tensile stress at these points were dangerous to promote the glass to break during the tempering. In addition, the point at the diagonal line of symmetry plane in the thickness direction, which is 14 mm from corner, has the maximum permanent tensile stress about 70.01 MPa in the flat glass after tempering. Thus, it is indicated that the corner is the weakest region in the tempered glass.

Low-cost thermal insulation porous ceramics with uniform pore diameter and low bulk density were prepared with soda-ash dregs and felsic tailings. We investigated the effect of temperature, foaming agent, fluxing agent, Al₂O₃ and CaO content on the pore structure and crystal phase of porous ceramics. The effect of Ca²⁺ in soda-ash dregs on the preparation of quartz-feldspar based porous ceramics was studied. The results showed that the contribution of Ca²⁺ to the preparation of porous ceramics in this system was mainly to accelerate the Si-O bond fracture and reduce the sintering temperature at the initial stage of sintering, which destroyed the needle-like feldspar in the high temperature melt and reduced the melt viscosity, thus reduced the foaming resistance and promoted the porous products with uniform pore size distribution. The Ca²⁺ content on the high side can participate in the formation of crystals in sintering. The generated needle-like diopside and augite, which have small length-diameter ratio, will negligibly change in the viscosity of melt at high temperatures, and their inhibition effect on pores is not as good as that of feldspar with large length-diameter ratio, resulting in the merger and collapse of pores. But the increase of diopside and augite can improve the compressive strength of porous products to some extent. Porous ceramic products containing needle-like feldspar phase can be prepared by using two kinds of solid waste, which can improve the compressive strength of the products and reduce the raw material cost and energy consumption while comprehensively utilizing the double solid waste. The optimal product has a bulk density of 0.45 g/cm³, a compressive strength of 3.17 MPa, and a thermal conductivity of 0.11 W/(m·K).

A microwave absorbing sheet with a high complex permeability and a relatively low complex permittivity is obtained by molding of the densely coated flaky carbonyl iron particles (FCIPs) by styrenebutadiene-styrene block copolymer (SBS) in the assistance of coupling agent modification. Direct molding of the core-shell FCIPs without adding extra binder results in a large permeability due to the high filling ratio (55 vol%) of absorbents. Importantly, the permittivity is well suppressed by the dense insulate polymer shell on the FCIPs, avoiding the severe impedance mismatch problem of the high filler content microwave absorbing materials. Investigations show that modifying the surface of FCIPs by proper amount of silane coupling agent is critical for the coating quality of the SBS shell, which is verified by resistivity and corrosion current density measurements, and can be interpreted by improved interfacial compatibility between the modified FCIPs and SBS. The obtained microwave absorbing sheet shows a minimum reflection loss of −38.74 dB at 1.57 GHz and has an effective absorption bandwidth from 1.1 to 2.3 GHz at a relatively small thickness of 2 mm.

ZrC _x-NbC _y-Cu composites were fabricated by pressure-less reactive infiltration of Zr-Cu binary melts into porous NbC preforms at 1 300 °C. The effect of Zr content in the infiltrator on microstructure of the as-synthesized composites was studied. Mechanical properties of the composites were reported. A partial displacement of Nb atoms in NbC by Zr atoms from Zr-Cu melt occurs during the reaction between Zr-Cu melt and porous NbC preform. The formation of a core-shell structure suggests the reaction is mainly a dissolution-precipitation type. NbC dissolves into Zr-Cu melt, from which the (Nb,Zr)C_z phase precipitates and grows. With increasing Zr content in the Zr-Cu infiltrator, the reaction is enhanced and the infiltration is easily chocked. ZrC _x-NbC _y-Cu composite is synthesized using Zr₁₄Cu₅₁ infiltrator. The flexural strength and fracture toughness of ZrC _x-NbC _y-Cu composite reach 637 MPa and 12.7 MPa·m^1/2, respectively. And the improved toughness is probably attributed to residual Cu phase and plate-like Nb _xC _y phases.

Solid acid MoO₃/ZrO₂-TiO₂ catalysts were prepared by impregnation method, and catalytic hydrolysis of difluorodichloromethane(CFC-12) over the catalyst was studied. The presence of MoO₃/ZrO₂-TiO₂ catalyst in polycrystalline state could be clearly observed by transmission electron microscopy (TEM). Mesopores were detected by N₂ adsorption-desorption isotherms which further confirmed the MoO₃/ZrO₂-TiO₂ structural characteristics of catalyst. The results of NH₃-TPD showed that the calcination temperatures had a great influence on the acidity of the catalyst, and the weak acidic site had a strong catalytic activity for the catalytic hydrolysis of CFC-12. Moreover, ZrO₂-TiO₂ was highly dispersed in the MoO₃ framework, suggested by powder X-ray diffraction (XRD) and N₂ adsorption-desorption results. The effects of the catalyst calcination temperatures on the conversion rate of CFC-12 were studied. The effects of catalytic hydrolysis temperatures and water vapor concentration on the catalytic hydrolysis rate of CFC-12 were also studied. The solid acid MoO₃/ZrO₂-TiO₂ was calcined at 500 °C for 3 h at a catalytic hydrolysis temperature of 400 °C and water vapor concentration of 83.18%, and catalytic hydrolysis rate of CFC-12 reached 98.65 %. The hydrolysis rate of CFC-12 remained above 65.34% after 30 hours continuous reaction.

The forming process of the flexible ultrathin glasses (UTG) prepared by the redrawing method was numerically simulated using ANSYS Polyflow software. In the forming process by the redrawing method, temperature, viscosity, transverse and longitudinal velocity distribution of the glasses with different compositions were studied. Furthermore, the influence of these factors on the width and thickness of the flexible glass plate was investigated. It is found that the internal and external heat exchange of glass has a dominant influence on the viscosity variation during the UTG forming process, which is inconsistent with the general viscosity-temperature dependence. The glass that first reaches the lower limit of forming viscosity can significantly resist the shrinking effect caused by surface tension, making the glass wider during the forming. If the original glass width remains unchanged, the glass thickness or feeding speed is reduced, wider and thinner flexible glasses can be produced.

Cu-Mn₃O₄ composite coating was prepared on the SUS 430 ferritic stainless steel by electrodeposition and then exposed in air at 800 °C corresponding to the cathode atmosphere of solid oxide fuel cell (SOFC). A dual-layer oxide structure mainly comprising an external layer of CuO followed by (Cu,Mn,Fe)₃O₄ spinel and an internal layer of Cr-rich oxide was thermally developed on the coated steel. The scale area-specific resistances (ASRs) of the coated steels were lower than the scale ASR of the uncoated steel after identical thermal exposure. The external layer of CuO/(Cu,Mn,Fe)₃O₄ spinel not only served as a barrier to reduce the growth rate of Cr-rich oxide internal layer and to suppress the outward diffusion of Cr, but also lowered the surface scale ASRs considerably.

This paper describes a study on the corrosion behavior of steel reinforcement in CAC mortars via electrochemical methods including corrosion potential, electrochemical impedance, and linear polarization evaluation. Results indicate that there is a non-linear relationship between the corrosion degree of steel reinforcement in CAC mortar and the concentration of NaCl solution. The electrochemical parameters of specimens immersed in 3% NaCl solution suddenly drop at 40 days, earlier than 60 days of the reference. And the charge transfer resistivity of the specimen has decreased by 11 orders of magnitude at 40 days, showing an evident corrosion on steel reinforcement. However, it is interesting to notice that the corrosion is delayed by high external chloride concentration. The specimens immersed in 9% and 15% NaCl solutions remain in a relatively stable state within 120 days with slight pitting. The great corrosion protection of CAC concrete to embedded steel bars enables its wide application in marine.

By means of low-field nuclear magnetic resonance (LF-NMR), the transverse relaxation time (T ₂) signals of physically bound water in cement paste were monitored to indicate water content change and characterize the early-age hydration process. With the curves of the T ₂ signals and hydration time obtained, the hydration process could be divided into four typical periods using the null points of the second derivative curve, and the influences of water-cement ratio (w/c) and hydration heat regulating materials (HHRM) on hydration process were analyzed. The experimental results showed that the hydration rate of pure cement paste in accelerated period presented a positive correlation with w/c. Compared to pure cement paste, the addition of HHRM extended all four periods, and led to a much faster hydration rate in initial period as well as a slower rate in accelerated period. Finally, according to the LF-NMR test results, the early-age hydration model of cementitious materials was proposed considering w/c and HHRM content.

To evaluate various interlaminar bonding reinforcement techniques used for steel bridge decks, the UHPC surface was roughened with shot blasting (SB), transverse grooving (TG) and surface embedded stone (S), epoxy resin (E), epoxy asphalt (EA) and high viscosity high elasticity asphalt (HV) as interlayer bonding materials. In addition, a diagonal shear test was conducted using a self-designed diagonal shear jig. The effects of adhesive layer materials type, surface texture type, and different loading rates on the interlaminar bonding performance of UHPC/SMA combination specimens were investigated. The experimental study showed that the peak shear strength and shear modulus of the combined specimen decreased gradually with the decrease of thermosetting of the adhesive layer materials. The peak shear fracture energy of E was greater than that of HV and EA. The synergistic effect of the contact force generated by the roughing of the UHPC surface, the friction force, and the bonding force provided by the adhesive layer material can significantly improve the interlaminar shear performance of the assemblies. The power-law function of shear strength and shear modulus was proposed. The power-law model of peak shear strength and loading rate was verified. The shear strength and predicted shear strength satisfy the positive proportional functions with scale factors of 0.985, 1.015, 0.961, and 1.028, respectively.

To enhance the thermoelectric effect of cement-based materials, conductive polyaniline (PANI) modified MnO₂ powder was synthesized and used as a thermoelectric component in the cement composites. The nanostructured PANI was deposited on the surface of the nanorod-shaped α-MnO₂ particle and the weight ratio of PANI to MnO₂ was 22.3:77.7 in the composite. The synthesized PANI/MnO₂ composite was nanostructured according to the SEM image. The test results of the thermoelectric properties proved that the PANI/MnO₂ composite was effective as the Seebeck coefficient and electrical conductivity values of the cement composites with PANI/MnO₂ inside were 3–4 orders of magnitude higher than those of pure cement paste and the thermal conductivity values of these cement samples were similar. The obtained maximum figure of merit (ZT) value (2.75×10⁻³) was much larger than that of conductive materials reinforced cement-based composites. The thermoelectric effect of cement composites is mainly enhanced by the increased Seebeck coefficient and electrical conductivity in this work.

The engineering characteristics of the soil, soil-fly ash and fly ash-lime, were examined to utilize as base layer material in civil construction. The influence of fly ash percentage and the effect of curing on California bearing ratio (CBR) and unconfined compressive strength (UCS), of soil and soil - fly ash mixing and layered system were examined to estimate the optimum quantity. The volumetric swelling of the optimal mixture was estimated to be within the allowable limits. Scanning microscope analysis and X-ray diffraction tests were performed. A model test analyses with three layers were conducted by finite element method and stress-strain behavior was observed.

The surface of carbon nanotubes (CNTs) was modified by plasma to improve the dispersion, conductivity and adsorption properties of carbon nanotubes. Cement-based composites made with plasma-treated carbon nanotubes (P-CNTs) at different perntages were tested under repeated cyclic axial compressive stress by four electrode methods to measure the electric resistance. Those made with CNTs without plasma treatment as controls were tested also. The results showed that electric resistance change values of the cement mortar with P-CNT and CNT were all monatomic corresponding to the cyclic loading. When the water-cement ratio of the mortar was fixed, increasing of the P-CNT/CNT content would increase the resistance change value of the mortars added with P-CNT/CNT, and the sensitivity performance. It has certain engineering application value

A novel high-strength straight-hole recycled pervious concrete (HSRPC) for the secondary highway pavement was prepared in this paper. This study aimed to investigate the effect of porosity (0.126%, 0.502%, and 1.13%), vehicle loading stress level (0.5 and 0.8) and service life on the resistance to rainstorm-based waterlogging of HSRPC under fatigue loading. The mechanical properties of HSRPC in terms of flexural strength and dynamic elastic modulus were studied. The waterlogging resistance of HSRPC was described by surface water depth and drainage time. The microstructure of HSRPC were observed with scanning electron microscopy (SEM). Results showed that although the dynamic elastic modulus and flexural strength of HSRPC decreased with the increasing number of fatigue loading, the flexural strength of HSRPC was still greater than 5 MPa after design service life of 20 years. After 2.5×10⁵ times of fatigue loading, the permeability coefficient of HSRPC with a porosity of 0.502% and 1.13% increased by 18.4% and 22.9%, respectively; while the permeability coefficient of HSRPC with 0.126% porosity dropped to 0.35 mm/s. The maximum surface water depth of HSRPC with a porosity of 0.126%, 0.502%, and 1.13% were 8, 5 and 4 mm, respectively. SEM results showed that fatigue loading expanded the number and width of cracks around the tiny pores in HSRPC.

In order to investigate the behavior characteristics of asphalt components during the process of nano-cracks temperature self-healing (NTS), molecular simulation technology was used to simulate the temperature self-healing of asphalt. Based on the determination of asphalts (virgin asphalt and aged asphalt), the proportional changes of asphalt components were confirmed. The distribution characteristics of asphalt components were obtained by marking different components in the process of NTS. At the same time, the rationality of the micro simulation findings was confirmed by asphalt performance tests and infrared spectroscopy results. The results show that different asphalt components have different behavior characteristics in the process of NTS. The content of asphaltene and resin plays a key role in the process of NTS, while saturation and aromatics play an active role in the temperature self-healing before and after aging. The NTS is the result of the comprehensive action of different components, and the self-healing efficiency is proportional to the relative molecular mass. The effect of aging on the NTS is also realized by changing the proportion of asphalt components.

In order to comprehensively utilize the remaining bamboo residue of bamboo products, this paper presents a research on recycling the bamboo fibers from bamboo residue for improving the performance of the asphalt mixtures. First of all, the basic performance parameters of sinocalamus affinis fiber, phyllostachys pubescens fiber, green bamboo fiber were tested and analyzed, and the optimal content and length were put forward. Then, the mix ratio design of the bamboo fiber modified asphalt mixture was further designed through the response surface method, and was verified the rationality of the mix ratio. Finally, the mixture specimens were made according to the experimental design mix ratio, and the high temperature, low temperature performance and moisture susceptibility of the bamboo fiber modified mixtures asphalt were tested. The results showed that the high temperature performance, low temperature performance and moisture susceptibility of bamboo fiber modified asphalt mixtures were improved compared with the performance of SBS modified asphalt mixture. When the length of bamboo fiber is 7.25 mm and the content of 0.22%, the road performance of the asphalt mixture was optimal. Consequentially, the decomposition of bamboo residue into bamboo fiber and its application in asphalt pavement can improve the reuse of bamboo waste, with remarkable environmental benefits and great promotion value.

The effect of the inlet gas pressure, supplementary gas pressure and nozzle channel dispersion angle on the pre-breakup behavior of Ti-6Al-4V (TC4) discontinuous droplets during EIGA was investigated by combining numerical simulation with experiments. The results show that the axial velocity at the recirculation zone before the stagnation location was first increased and decreased then increased significantly after the peak value, while the pressure of the recirculation zone increased with the increase in inlet pressure. With the supplementary pressure increasing, the velocity magnitude and range of the recirculation zone gradually decreased. As the dispersion angle of the nozzle channel increased, the pre-breakup efficiency of droplets gradually decreased, but the adhesion phenomenon of droplets on the inner wall surface of the nozzle channel (IWSNC) gradually weakened. Under the inlet pressure of 4 MPa, a supplementary pressure of 0.05 MPa, and the dispersion angle of 15°, the uniform and spherical TC4 powders with diameter of 70 µm were prepared, which was consistent with the simulation results. The optimized process parameters is a balance between the size of the pre-atomized particles and the back-spraying and bonding phenomenons of droplets.

A kind of micro/nanostructured 2205 duplex stainless steel (DSS) with uniform distribution of nanocrystals was prepared via aluminothermic reaction method. The analysis of stress-strain curve showed that the fracture strength and elongation of the specimen were 946 MPa and 24.7%, respectively. At present, the research on microstructure of bimodal 2205 DSS at room temperature (RT) mainly depended on scanning electron microscope (SEM) observation after loading experiments. The test result indicates that there are two different yield stages in stress-strain curve of specimen during tensile process. The microstructure of duplex bimodal structured stainless steel consists of two pairs of soft hard regions and phases. By studying deformation mechanism of bimodal structured stainless steel, the interaction between soft phase and hard phase are discussed. The principle of composition design and microstructure control of typical duplex stainless steel is obtained, which provides an important research basis for designing of advanced duplex stainless steel.

The effects of pressure on structural, elastic and electronic properties of Mg _xLa (x=1, 2, 3) compounds are investigated by using CASTEP program based on the density functional theory. The calculated equilibrium lattice parameters at zero pressure agree well with available experimental and theoretical values. The calculated DOS show that the structure of these compounds remains mechanically stable and structural phase transformation is not induced with increasing pressure from 0 to 30 GPa, and their structural stability increases with pressure. The ductility of MgLa can be improved by increasing pressure, which is the same as Mg₂La in 0–20 GPa, while brittle behavior turns into ductile behavior in 0–5 GPa for Mg₃La. The resistance to volume deformation of Mg _xLa (x=1, 2, 3) compounds can be improved as the pressure increases. The shear deformation resistance and elastic stiffness of Mg₃La can be enhanced by rising pressure, but MgLa and Mg₂La increase first and then decrease when pressure is up to 25 GPa. In addition, the three compounds exhibit the elastic anisotropy with pressure.

The effects of SiC particles (SiCp) on high temperature oxidation behavior of titanium matrix composites (TMCs) under different powder metallurgy processes were investigated. In situ TiC + Ti₅Si₃ reinforced titanium matrix composites were prepared by discharge plasma sintering (SPS) and argon protective sintering (APS). The results show that the two processes have a negligible effect on the composition and hardness of the samples, but the hardness of the two samples is significantly improved by adding SiCp. The apparent porosity of SPS process is obviously smaller than that of APS process, whereas, the apparent porosity increases slightly with the addition of SiCp. The oxide layer thickness and mass gain of the samples obtained by SPS process are smaller than those obtained by APS process. The oxide thickness and mass gain of both processes are further reduced by adding SiCp. The SPS composites showed the best high temperature oxidation resistance. Therefore, TMCs with SiCp by SPS can effectively improve the high-temperature oxidation behavior of the materials.

Sorbitol, triethanolamine, sodium benzoate, boric acid, and sodium carbonate were mixed to prepare a waterborne rust inhibitor. A temperature and humidity accelerated corrosion test was applied to investigate the corrosion behaviour of waterborne rust inhibitor coated Q235 steel and original Q235 steel, which was carried out in a temperature and humidity test chamber (WSHW-1000) at a temperature of 80 °C and humidity of 95%. Compared with the original Q235, waterborne rust inhibitor coated Q235 has better resistance to corrosion in hot and humid ambient conditions. Electrochemical impedance spectroscopy and potentiodynamic polarization were measured with a three-electrode cell in 3.5% NaCl aqueous solution on a CHI760E potentiostat/galvanostat. Molecular dynamics was simulated to verify the synergistic corrosion inhibitory mechanism of sodium carbonate and triethanolamine. The test shows that the prepared waterborne rust inhibitor can reduce the tendency of Q235 to corrosion and can also effectively reduce the corrosion rate.

Shot peening is a surface modification technology with the metal surface nano machine (SNC), which can modify the surface microstructure and extend the fatigue life of Cu-19Ni alloy. The hardness, damage evolution and mechanical properties were investigated and characterized by scanning electron microscope (SEM), laser confocal microscope (LSM) and material surface performance tester (CFT). The results showed that the surface roughness and friction coefficient of Cu-19Ni alloy decreased with the increase of shot peening duration and diameter, while the microhardness and strength increased. Moreover, with the increase in shot peening duration and diameter, SEM observation showed that the fracture dimples became smaller, meanwhile, with the increase of small cleavage planes, shear tearing ridges and the thickness of the surface nano layer, the fracture mode gradually evolved from plastic to brittle fracture. The uniaxial tensile test of shot peened Cu-19Ni alloy was carried out by MTS testing machine combined with digital image correlation technology (DIC). The evolution of Cu-19Ni surface damage was analyzed, and the evolution equations describing the damage of large deformation zone and small deformation zone were established. The effect of shot peening on the damage evolution behavior of Cu-19Ni alloy was revealed.

To investigate the effectiveness of self-made zinc alloy sacrificial anode material for the protection of reinforcement in concrete under chlorine salt erosion environment, salt solution immersion corrosion and electromigration accelerated corrosion tests were used to evaluate the effectiveness of self-made zinc alloy anode with the help of relevant cathodic protection guidelines and evaluation criteria for the corrosion of reinforcement in concrete. The results showed that the protection was effective because the potential of the zinc alloy anode protection steel bar in the salt solution satisfied the “−780 mV (SCE)” validity criterion. The self-corrosion potential (E _corr) of the sacrificial anode protection steel in concrete was greater than −276 mV, and the protective current density of the zinc alloy anode was 1–3 µA·cm⁻², which met the standards of EN12696-2000, further indicating that the self-made zinc alloy sacrificial anode had a good protection combining with the polarization resistance and the appearance of the corroded surface of the steel in concrete. The microscopic morphology of the corroded surface and the composition of the corrosion products indicates that the mortar of the self-made zinc alloy anode has a lower pH than the imported anodes, so the long-term protection of the self-made zinc alloy sacrificial anode needs to be further improved.

Aluminum alloy tubes were prepared by tube spinning. The intergranular and electrochemical corrosion tests were used to investigate the intergranular corrosion behavior of the 5A06 aluminum alloy blank sample and the spinning sample. Results showed that the intergranular corrosion resistance of the spinning sample was higher than that of the blank sample. In addition, the electrochemical corrosion resistance of the spinning sample was higher than that of the blank sample. The EDS maps indicated a uniform element distribution pattern of aluminum and magnesium. Moreover, the phase composition and lattice constant of the samples were obtained by XRD analysis. The differences in microstructure between the aluminum alloy subjected to the spinning process and the untreated aluminum alloy were determined by EBSD. The differences were mainly attributed to the complex interactions among grain size, dislocations and grain boundaries.

A novel polypropylene random (PPR) composite materials with optimized properties was developed by adding β-nucleating compound agents (rare earth complex WBG-2 and aryl amide derivative TMB-5) and ternary compound modifier (TPE/WBG-2/CaCO₃). The effects of different β-nucleating agents and ternary compound modifier on the mechanical properties and crystallization behavior of PPR were analyzed. The results show that, compared with pure PPR materials, both WBG-2 and TMB-5 could significantly improve the impact strength of PPR. The crystallization temperature of PPR increased with the addition of β-nucleating agent. The modified PPR prepared with ternary compound modifier showed the most excellent comprehensive properties.

The main objective of this work was to study and develop composite materials by experiments with mixtures of synthetic (glass fiber, carbon fiber) and natural fiber (durian skin fiber) reinforcements on a polylactic acid (PLA) matrix composite, because of its excellent mechanical properties. Durian skin fiber (DSF) is a natural waste throughout Thailand, and an alternative to recycling is to realize its potential as a new reinforcement through mixing and the injection molding processes. The flexural strength (σ _F) and flexural modulus (E _F) of the composites from specimens showed a maximum value by content of durian skin fiber at 10 wt%, for good performance relative to particle dispersion between the matrix and the fiber, and showed a minimum value by content of durian skin fiber at 20 wt%, because the reinforcement material affects the mechanical properties in the experiments.

This work aims at investigating the microwave absorption and mechanical properties of short-cutted carbon fiber/glass fiber hybrid veil reinforced epoxy composites. The short-cutted carbon fibers (CFs)/glass fibers (GFs) hybrid veil were prepared by papermaking technology, and composites liquid molding was employed to manufacture CFs/GFs hybrid epoxy composites. The microstructure, microwave absorbing properties and mechanical properties of the hybrid epoxy composites were studied by using SEM, vector network analyzer and universal material testing, respectively. The reflection coefficient of the composites were calculated by the measured complex permittivity and permeability in the X-band (8.2–12.4 GHz) range. The optimum microwave absorption properties can be obtained when the content of CFs in the hybrid veil is 6 wt% and the thickness of the composites is 2 mm, the minimum reflection coefficient of -31.8 dB and the effective absorption bandwidth is 2.1 GHz, which is ascribed to benefitting impedance matching characteristic and dielectric loss of the carbon fiber. Simultaneously the tensile strength and modulus can achieve 104.0 and 2.98 GPa, demonstrating that the CFs/GFs hybrid epoxy composites can be a promising candidate of microwave absorbing materials with high mechanical properties.

The aim of the study was to investigate the effect of different surface treatment of titanium (Ti) on the adhesion test results for dental application. Ti substrates roughened by 400 to 1 500-grit SiC polish papers and alumina blasting, alkali treated by 5 molar (M) NaOH and KOH solutions and heat treated at the temperature range of 400–800 °C were used in this study. The treated samples were subjected to the adhesion test. According to the results of the adhesion test, the adhesive strength showed the highest value for the blasted titanium among all polished and blasted samples. The Ti samples heated at 650 °C showed the highest adhesive strength among all heat-treated samples. Further, the adhesion test results indicated the higher adhesive strength of chemically treated samples treated by NaOH rather than that by KOH. The polished and heated Ti samples showed the highest adhesive strength among all samples.