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反应增容HDPE基木塑复合材料及增容机制

, PP. 125-132

Keywords: 高密度聚乙烯,(HDPE),木纤维,复合材料,反应挤出,增容

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Abstract:

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。

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