Curing mechanism of TDE-85/MeTHPA epoxy resin modified by polyurethane

Abstract

Diglycidyl 4,5-epoxy tetrahydro phthalate/methyl tetrahydrophthalic anhydride (TDE-85/MeTHPA) epoxy resin modified by polyurethane (PU) was prepared with 1,4-butanediol (1,4-BDO), trimethylol propane (TMP) and polyurethane prepolymer synthesized by polypropylene glycol and toluene diisocynate. Chemical reaction and curing mechanism of this system were discussed by incorporating the results of infra spectrum analysis. The results indicate that the epoxy polymeric network I is obtained by the curing reaction between TDE-85 and MeTHPA, while the PU polymeric network II is obtained by the chain-extended and crosslinking reaction between 1,4-BDO, TMP and polyurethane prepolymer(PUP). The graft chemical bonds are formed between polymer networks I and II that therefore increase the degree of blend and compatibility between epoxy polymer and PU.

Keywords

polyurethane / epoxy resin / modification / curing mechanism

References

[1] LiZ.-h., XieK.-y., ZhengZ.-qiao.. Morphology and mechanical properties of MG/PU/EP encapsulating composite[J]. Journal of Central South University: Natural and Technology, 2007, 38(1): 51-55

[2] ZhangC.-h., HanB., HuangY.-ding.. Study on properties of TDE-85/aromatic diamine matrix and carbon fiber composites[J]. Journal of Harbin University of Science and Technology, 2000, 5(5): 60-63

[3] LiZ.-h., RenD.-y., ZhengZ.-q., et al.. Curing reaction of TDE-85/MeTHPA resin modified by polyurethane[J]. Journal of Central South University: Natural and Science, 2007, 38(2): 213-217

[4] HsiehK. H., HanJ. L., YuC. T., et al.. Graft interpenetrating polymer networks of urethane-modified bismale-imide and epoxy (I): Mechanical behavior and morphology[J]. Polymer, 2001, 42(6): 2491-2500

[5] HuaF. J., HuC. P.. Interpenetrating polymer networks of epoxy resin and urethane acrylate resin(1): Kinetics of network formation[J]. European Polymer Journal, 1999, 35(1): 103-112

[6] YeganehH., LakourajM. M., JamshidiS., et al.. Synthesis and properties of biodegradable elastomeric epoxy modified polyurethanes based on poly(ɛ-caprolactone) and poly(ethylene glycol)[J]. European Polymer Journal, 2005, 41(10): 2370-2379

[7] ChenL., ChenS.. Latex interpenetrating networks based on polyurethane polyacrylate and epoxy resin[J]. Progress in Organic Coating, 2004, 49(3): 252-258

[8] Anand PrabuA., AlagarM.. Mechanical and thermal studies of intercross-linked networks based on siliconized polyurethane-epoxy/unsaturated polyester coatings[J]. Progress in Organic Coating, 2004, 49(3): 236-243

[9] ShiL.-y., ZhangJ.-ping.. Preparation and tensile property of PU/EP graft-IPNs[J]. Journal of Shanghai University: Natural Science, 1998, 4(6): 36-47

[10] XieH.-q., GuoJ.-shi.. Room temperature synthesis and mechanical properties of two kinds of elastomeric interpenetrating polymer networks based on castor oil[J]. European Polymer Journal, 2002, 38(11): 2270-2277

[11] WidmaierJ. M., NillyA., ChemalJ. M., et al.. Dependence of the phase separation process on the relative onset of network formation in simultaneous interpenetrating polymer networks[J]. Polymer, 2005, 46(10): 3318-3322

[12] HorichkoE. Y., KuksinA. M., HorichkoV. V., et al.. Kinetics of the step-growth polymerization of epoxide in the presence of the linear polyurethane: Effect of the phase separation of components[J]. Reactive and Functional Polymers, 1997, 33(2/3): 351-357

[13] HeS.-j., ShiK.-y., BaiJ., et al.. Studies on the properties of epoxy resins modified with chain-extended ureas[J]. Polymer, 2001, 42(23): 9641-9647

[14] RosuL., CascayalC. N., CiobanuC.. Effect of UV radiation on the semi-interpenetrating polymer networks based on polyurethane and epoxy maleate of bisphenol A[J]. Journal of Photochemistry and Photobiology A: Chemistry, 2005, 169(2): 177-185

[15] YangY.-h., FuW.-li.. Study on epoxy resin toughened and reinforced by polyurethane[J]. Thermosetting Resin, 2001, 16(1): 5-8

[16] RagostaG., MustoP., ScarinziG., et al.. Effects of perfluoroether concentration and curing protocol on morphology and mechanical properties of toughened TGDDM/MNA resin systems[J]. Polymer, 2003, 44(7): 2081-2090

[17] WenQ.-zhen.. The influence of chain extenders on the reaction rate of polyether-urethane prepolymers[J]. Journal of Naval University of Engineering, 2003, 15(1): 23-26

[18] LinM.-s., WangM.-w., ChengL.-an.. Photostabilization of an epoxy resin by forming interpenetrating polymer networks with bisphenol-A diacrylate[J]. Polymer Degradation and Stability, 1999, 66(3): 343-347