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首页> 外文期刊>Journal of Applied Polymer Science >Dependence of the mechanical properties of woodflour-polymer composites on the moisture content
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Dependence of the mechanical properties of woodflour-polymer composites on the moisture content

机译：木粉-聚合物复合材料的机械性能对水分含量的依赖性

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摘要

Woodflour of Eucaliptus saligna with two different chemical treatments (mercerization and esterification with maleic anhydride) was used as filler of an unsaturated polyester matrix. Woodflour was treated to increase the interfacial adhesion with the matrix, to improve the dispersion of the particles, and to decrease the water sorption properties of the final composite. The objective of this study was to determine the influence of the moisture content and the woodflour chemical modification on the physical and mechanical properties of the different composites. Results indicated that mechanical properties (compression and bending tests) were severely affected by moisture and chemical modifications. In wet conditions, the composites made from treated woodflour had the lowest flexural modulus and ultimate stress. It was found that this was a reversible effect, because the original values of the compression properties were recovered after drying. Temperature scans in dynamic mechanical tests showed that an irreversible change occurred during exposure to humid environments, probably due to the hydrolysis of the polyester matrix. Essentially, the same behavior was observed for matrix and composites; however, a wood-related transition overlapped the main transition in the case of wet composites. (C) 1998 John Wiley & Sons, Inc. [References: 13]
机译：用两种不同的化学处理（丝光和马来酸酐酯化）处理的赤桉木屑用作不饱和聚酯基质的填料。对木粉进行了处理，以增加与基质的界面粘合力，改善颗粒的分散性，并降低最终复合材料的吸水性能。这项研究的目的是确定水分含量和木粉化学改性对不同复合材料的物理和机械性能的影响。结果表明，机械性能（压缩和弯曲试验）受到水分和化学改性的严重影响。在潮湿条件下，由处理过的木粉制成的复合材料的弯曲模量和极限应力最低。发现这是可逆的效果，因为在干燥后恢复了压缩性能的原始值。动态力学测试中的温度扫描表明，暴露于潮湿环境期间发生了不可逆的变化，这可能是由于聚酯基质的水解所致。本质上，基体和复合材料的行为相同。但是，在湿复合材料的情况下，木材相关的过渡与主要过渡重叠。 （C）1998 John Wiley＆Sons，Inc. [参考：13]

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