改性芳纶纤维增强木粉/高密度聚乙烯复合材料的力学性能

Mechanical properties of modified aramid fiber reinforced wood flour/high density polyethylene composites

采用螺杆挤出机研究了添加连续芳纶纤维增强木粉/高密度聚乙烯(CAF-WF/HDPE)复合材料,为改善CAF与WF/HDPE复合材料界面相容性,分别采用磷酸和硅烷偶联剂处理纤维。对比表面处理前后的CAF形态分析显示,经过处理的CAF表面粗糙度增加;采用磷酸和硅烷偶联剂处理,纤维束从基体中的拔出强度分别提高了94.9%和77.6%,表明处理后的CAF与WF/HDPE复合材料的界面结合强度有所提高。对比WF/HDPE复合材料,在挤出成型过程中加入未处理CAF,CAF-WF/HDPE复合材料拉伸强度、弯曲强度和冲击强度分别提高了32.1%、35.1%、515.1%;CAF采用硅烷偶联剂处理后,CAF-WF/HDPE复合材料对应的力学性能分别提高了42.0%、37.4%、550.2%。动态力学分析表明:表面处理后CAF与WF/HDPE复合材料的界面相容性得到改善。

The continuous aramid fiber(CAF)was added to wood flour/high density polyethylene(WF/HDPE)composites by screw extruder.Surface treatment of CAF with phosphoric acid and silane coupling agent was used to improve the interfacial compatibility between CAF and the WF/HDPE composites.The morphological analysis showed that the surface roughness of CAF increased after the surface treatment.Either the treatment of CAF with phosphoric acid or silane coupling agent,the pull-out strength of CAF bundle increases up to 94.9% and 77.6%,respectively.It shows that the interfacial bonding strength of the treated CAF and the WF/HDPE composites is enhanced.Compared with WF/HDPE composite without CAF,the composite with the untreated CAF results in that the tensile strength,flexural strength and impact strength of CAF-WF/HDPE composite increases by 32.1%,35.1% and 515.1%,respectively.After CAF treated with silane coupling agent,the mechanical properties of CAFWF/HDPE composite increase by 42.0%,37.4% and 550.2%.The dynamic mechanical analysis shows that the interfacial compatibility of the CAF and WF/HDPE composite is improved after surface treatment.