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The Influence of Accelerated Aging on the Properties of Wood-plastic Composite Materials--freeze-thaw, Xenon Accelerated Aging

Author: XiaoWei
Tutor: LiDaGang
School: Nanjing Forestry University
Course: Materials Science
Keywords: WPC(wood-plastic composites) bending strength creep mechanical models freeze-thaw cycles xenon accelerated weathering color weight
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 291
Quote: 4
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Abstract


Wood-plastic composite materials (WPC) get more and more attention from people, and the high performance is becoming more and more important. So the study on the mechanical and creep properties of wood-plastic composites at different environments is of great significance, especially in the harsh environment and long term usage.Four aspects are included in this paper: 1) the bending properties and creep properties of wood/HDPE composites and husk/HDPE composites are fine in room temperature; 2) the weight, color, bending properties and creep properties of two kinds of composites in different freeze-thaw temperature and cycles; 3) the weight, color, bending properties and creep properties of two kinds of composites in different xenon accelerated weathering time; 4) the influence of the bending resistance on the two kinds of composites at the interaction of freeze-thaw and xenon, and the significance of the factors of aging time and cycle temperature.We can get the following conclusion after analyzing the experimental test results:1)The bending resistance and creep properties of wood/HDPE composites and husk/HDPE composites are fine in room temperature; and the short-term creep model of the two kinds of composites can be simulated by burger model.2)The bending strength retention rate of wood/HDPE composites is higher than the rice husk/HDPE composites after different temperatures and different cycles of freeze-thaw cycle; the bending strength and creep performance of two kinds of composites reduced along with the increase of the temperature and cycle time; the bending properties of two kinds of composites decrease along with the increase of creep load; and there is no significant difference on the surface of two kinds composites.3)The bending strength retention rate of wood/HDPE composites is higher than the rice husk/HDPE composites after xenon accelerated weathering; the bending strength and creep performance of two kinds composites reduced along with the increase of the aging time; the surface color of two kinds of composites change from big to small; and also the weight reduce.4)The two factors of“aging time”and“cycle temperature”both have the significant influence on the performance of two kinds of wood-plastic composites which are aged by xenon and freeze-thaw; and the bending strength of the two kinds of wood-plastic composites decrease.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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