Creep behaviour of wood flour/poly(vinyl chloride) composites

Abstract

The experimental creep data were focused on wood-flour (WF) /poly vinyl chloride (PVC) composites with the variations in additive concentrations of wood flour, silane coupling agent, organomodified montmorillonite (OMMT) and nano-cacium carbonate (nano-CaCO₃). Their effects were analyzed using the Four-element Burger Model incorporating microscopic mechanisms. Total creep strain was low with increasing WF while elastic strain was high and plastic flow strain was low in modeling. Modification of WF with silane was beneficial to creep resistance, so did adding low ratio of OMMT (1.5 wt%) and nano-CaCO₃ in composites. Thus, it was effective in reducing creep either by stiffening the PVC matrix using rigid nano-particles or by improving their adhesion with resin. However, superfluous quantity of any additament did not benefit the improvement owing to either earlier destruction of their agglomerates or stress-concentrated cracks in the over-incrassated interface.

Keywords

composite / creep / wood flour / poly (vinyl chloride) / nano-particle

References

[1] Clemons C. Wood-plastic Composites in the United States[J]. Forest Products. J, 2002, 52(6): 9-18.

[2] Jiang H. H., Kamdem D. P. Development of Poly (vinyl chloride)/Wood Composites: a Literature Review[J]. J Vinyl Addit Technol, 2004, 10(2): 59-69.

[3] Clemons C. Wood-plastic Composites in the United States: the Interfacing of Two Industries[J]. Forest Product. J, 2002, 52(6): 10-18.

[4] Coutinho F. M. B., Costa T. H. S. Performance of Polypropylene-wood Fiber Composites[J]. Polymer Testing, 1999, 18(8): 581-587.

[5] Xu B., Simonsen J., Rochefort W. E. Creep Resistance of Wood-filled Polystyrene/High-density Polyethylene Blends[J]. Journal of Applied Polymer Science, 2001, 79(3): 418-425.

[6] Sain M. M., Balatinecz J., Law S. Creep Fatigue in Engineered Wood Fiber and Plastic Compositions[J]. Journal of Applied Polymer Science, 2000, 77(2): 260-268.

[7] Bledzki A. K., Faruk O. Creep and Impact Properties of Wood Fibre-polypropylene Composites: Influence of Temperature and Moisture Content[J]. Composites Science and Technology, 2004, 64(5): 693-700.

[8] Farid S. I., Koeitschot M. T., Spelt J. K. Wood-Flour-Reinforced Polyethylene: Viscoelastic Behavior and Threaded Fasteners[J]. Poly Eng and Sci, 2002, 42(12): 2 236-2 350.

[9] Park B., John J. B. Short Term Flexural Creep Behavior of Wood-Fiber/Polypropylene Composites[J]. Polymer composites, 1998, 19(4): 377-392.

[10] Lee S.-Y., Yang H.-S., Kim H.-J., . Creep Behavior and Manufacturing Parameters of Wood Flour Filled Polypropylene Composites[J]. Composite Structures, 2004, 65(3): 459-469.

[11] Jiang L., Wolcott M. P., Zhang J., . Flexural Properties of Surface Reinforced Wood/Plastic Deck Board[J]. Poly Eng and Sci, 2007, 47(3): 281-288.

[12] Pegoretti A., Kolarik J., Peroni C., . Recycled Poly(ethylene terephthalate)/Layered Silicate Nanocomposites: Morphology and Tensile Mechanical Properties[J]. Polymer, 2004, 45(8): 2 751-2 759.

[13] Zhang Z., Yang L., Friedrich K. Creep Resistant Polymeric Nanocomposites[J]. Polymer, 2004, 45(10): 3 481-3 485.

[14] Zhou T. H., Ruan W. H., Yang J. L., . A Novel Route for Improving Creep Resistance of Polymers Using Nanoparticles[J]. Composites Science and Technology, 2007, 67(11): 2 297-2 302.

[15] Zhao Y., Wang K., Zhu F., . Properties of Poly(vinyl chloride)/Wood Flour/Montmorillonite Composites: Effects of Coupling Agents and Layered Silicate[J]. Polymer Degradation and Stability, 2006, 91(12): 2 874-2 883.

[16] Findley W. N., Lai L. S., Onaran K. Creep and Relaxation of Nonlinear Viscoelastic Materials[M], 1976 New York North-Holland Publishing 53