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使用密炼机对木纤维(WF)进行酯化改性,将改性木纤维(EWF)与高密度聚乙烯(HDPE)、过氧化二异丙苯(DCP)混合,再用双螺杆挤出机反应挤出制备EWF/HDPE复合材料。使用FTIR、力学性能测试、SEM、广角X射线衍射(WAXD)和示差扫描量热-热重同步热分析(TG-DSC)研究了EWF/HDPE复合材料的微观结构和物理力学性能。结果表明,在密炼机中对WF的酯化改性成功地在WF表面引入了酯基;反应挤出所得EWF/HDPE复合材料与无增容WF/HDPE复合材料相比,其冲击和拉伸强度最大分别提高了112%和36%,EWF与HDPE两相之间的界面粘合明显改善,HDPE的晶粒尺寸有所增加,结晶度也有较大提高,但热稳定性有少许下降。EWF/HDPE复合材料力学性能的提高主要归因于反应挤出的增容作用,而非基体HDPE结晶结构的变化。
The wood fiber (WF) was esterified with an internal mixer, the modified wood fiber (EWF) was mixed with high density polyethylene (HDPE) and dicumyl peroxide (DCP) Preparation of EWF / HDPE Composites by Reactive Extrusion. The microstructures and physical and mechanical properties of EWF / HDPE composites were investigated by FTIR, mechanical properties test, SEM, WAXD and TG-DSC. The results showed that esterification of WF in an internal mixer successfully introduced ester groups onto the surface of WF. Compared with non-compatibilized WF / HDPE composites, the impact and pull of EWF / HDPE composites The tensile strength of HDPE increased by 112% and 36% respectively. The interfacial adhesion between the two phases of EWF and HDPE improved obviously. The grain size of HDPE increased and the crystallinity increased greatly, but the thermal stability decreased slightly. The improvement of mechanical properties of EWF / HDPE composites is mainly attributed to the compatibilization of reactive extrusion rather than the change of the crystalline structure of matrix HDPE.