摘要
采用热压成型法制备了4种不同尺寸,即125-180μm、180-425μm、425-850μm和850-2 000μm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）、24h蠕变-24h回复测试和1 000h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26.71MPa,弹性模量达到2.73GPa;PWF长度从180μm增加到2 000μm,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850-2 000μm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%;1 000h形变仅为0.809mm,对比其他尺寸的PWF/HDPE复合材料1 000h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%.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2016年第6期1168-1173,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(31460171)
贵州省科学技术基金(黔科合J字[2015]2075号)
关键词
复合材料
热压
纤维尺寸
力学性能
蠕变
composites
hot-compression
fiber size
mechanical properties
creep
