采用热压成型法制备了4种不同尺寸,即125~180μm、180~425μm、425~850μm和850~2000μm的杨木纤维(PWF)/高密度聚乙烯(HDPE)复合材料,并对PWF/HDPE复合材料进行了弯曲性能测试、冲击性能测试、动态热力学分析(DMA)、24 h蠕变-24 h回复测试和1000 h 长期蠕变测试。结果表明：PWF的尺寸过大或者过小均不利于提高 PWF/HDPE 复合材料的弯曲性能,增强效果最好的是425~850μm PWF/HDPE 复合材料,其弯曲强度达到26.71 MPa,弹性模量达到2.73 GPa；PWF长度从180μm增加到2000μm,PWF/HDPE复合材料的抗冲击性能变化不大；125~180μm PWF/HDPE复合材料的抗冲击性能较差；短 PWF/HDPE复合材料的抗蠕变性能较差,不适合在长期负载的条件下工作,而850~2000μm的长 PWF/HDPE复合材料的抗长期蠕变性能最好,且回复率最高,为78.46%；1000 h 形变仅为0.809 mm,对比其他尺寸的 PWF/HDPE 复合材料1000 h 形变的平均值降低了48.00%。
Four kinds of poplar wood fibers (PWF,125-180μm,180-425 μm,425-850μm and 850-2 000μm)/high-density polyethylene (HDPE)composites were prepared by means of hot-compression molding.The flexural property test,impact property test,dynamic thermo-mechanical analysis(DMA),24 h creep-24 h recovery test and 1 000 h long-term creep tests were performed for PWF/HDPE composites.The results show that the excessively large or small PWF size is not positively for improving the flexural property of PWF/HDPE composites.PWF/HDPE composites with fibers of 425-850 μm present the best enhancement effect.The flexural strength and the elastic modulus of 425-850μm PWF/HDPE composites are 26.71 MPa and 2.73 GPa,respectively.Impact resist-ance property of PWF/HDPE composites keeps constant,while the PWF size increases from 180μm to 2 000μm. Whereas,125-180μm PWF/HDPE composites have the lowest impact resistance property.The PWF/HDPE com-posites with small fibers have the worst anti-creep performance,indicating that it is not suitable for long-term load-ing.850-2 000μm PWF/HDPE composites with long fibers have outstanding long-term anti-creep performance and recovery (78.46%),and its 1 000 h deformation is just 0.809 mm,which compares with the average values of 1 000 h deformation for other PWF/HDPE composites and decreases by 48.00%.
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