Effects of the Accelerated Freeze-Thaw Cycling on Physical and Mechanical Properties of Wood Flour-Recycled Thermoplastic Composites
Effects of the Accelerated Freeze-Thaw Cycling on Physical and Mechanical Properties of Wood Flour-Recycled Thermoplastic Composites
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DOI：
10.1002/pc.20782
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发表时间：
2010-02-01
影响因子：
5.2
通讯作者：
Staiger, Mark P.
中科院分区：
文献类型：
--
作者：
Adhikary, Kamal Babu;Pang, Shusheng;Staiger, Mark P.
研究了木塑复合材料在浸水-冻融加速循环条件下的耐久性能。本研究中使用的WPC由高密度聚乙烯（HDPE）或聚丙烯（PP）与辐射松（Pinus radiata）木粉通过热压成型制成。这两种类型的塑料包括配方中的回收和原始形式。在实验中，测量FT循环复合材料和对照样品的表面颜色、弯曲性能和尺寸稳定性性能（吸水性和厚度溶胀）。研究了复合材料的界面结构和热性能。结果表明，复合材料的吸水率和厚度膨胀率随着FT老化的进行而增大。同时，弯曲强度和刚度下降。断裂表面的扫描电子显微镜（SEM）图像证实了木粉和聚合物基质之间的界面结合的损失。差示扫描量热法（DSC）表明，与纯PP和HDPE样品相比，木粉-塑料复合材料的结晶焓和结晶度降低。FT循环复合材料使用的原生塑料（vPP和vHDPE）的结晶度增加，然而，与相应的对照样品相比，与回收塑料的复合材料下降。在一般情况下，复合材料的性能显着下降后，加速FT循环。Polym. COMPOS.，31：185-194，2010. (C)2009年塑料工程师学会
This study investigated durability performance of wood-plastic composites (WPCs) that were exposed to accelerated cycling of water immersion followed by freeze thaw (FT). The WPCs used in this study were made of high-density polyethylene (HDPE) or polypropylene (PP) with radiata pine (Pinus radiata) wood flour using hot-press molding. These two types of plastics included both recycled and virgin forms in the formulation. In the experiments, surface color, flexural properties, and dimensional stability properties (water absorption and thickness swelling) were measured for the FT cycled composites and the control samples. Interface microstructures and thermal properties of the composites were also investigated. The results show that the water absorption and the thickness swelling of the composites increased with the FT weathering. In the meantime, the flexural strength and stiffness decreased. Scanning electron microscopy (SEM) images of the fractured surfaces confirmed a loss of interface bonding between the wood flour and the polymer matrix. Differential scanning calorimetry (DSC) showed a decrease in crystallization enthalpy and crystallinity of the wood flour-plastic composites as compared with the neat PP and HDPE samples. The crystallinity of the FT cycled composites using the virgin plastics (vPP and vHDPE) increased; however, the composites with the recycled plastics decreased in comparison with corresponding control samples. In general, the properties of the composites were degraded significantly after the accelerated FT cycling. POLYM. COMPOS., 31:185-194, 2010. (C) 2009 Society of Plastics Engineers