半纤维素
材料科学
木粉
复合材料
极限抗拉强度
纤维素
聚丙烯
热稳定性
制浆造纸工业
木质素
萃取(化学)
化学
色谱法
工程类
有机化学
作者
Omid Hosseinaei,Siqun Wang,A A Enayati,Timothy G. Rials
标识
DOI:10.1016/j.compositesa.2012.01.007
摘要
Hygroscopicity, low durability, and low thermal resistance are disadvantages of lignocellulosic materials that also plague wood–plastic composites (WPCs). Hemicellulose is the most hydrophilic wood polymer and is currently considered as a sugar source for the bioethanol industry. The objective of this research is to extract hemicellulose from woody materials and enhance the properties of WPC by diminishing the hydrophilic character of wood. Hemicellulose of Southern Yellow Pine was extracted by hot-water at three different temperatures: 140, 155, and 170 °C. Wood flour was compounded with polypropylene in an extruder, both with and without a coupling agent. Injection molding was used to make tensile test samples. The thermal stability of wood flour was found to have increased after extraction. Extraction of hemicellulose improved the tensile strength and water resistance of composites, which may indicate a decrease in the hygroscopicity of wood flour, better compatibility, and interfacial bonding of the filler and matrix.
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