反应增容HDPE基木塑复合材料及增容机制  

Reactive compatibilization of wood fibre/HDPE composites and its mechanism

作　　者：罗卫华[1] 王正良[1] 袁彩霞[1] 吴义强[1] 唐忠荣[1] 

机构地区：[1]中南林业科技大学材料科学与工程学院,长沙410004

出　　处：《复合材料学报》2014年第1期125-132,共8页Acta Materiae Compositae Sinica

基　　金：湖南省科技计划(2010FJ6006);国家"948"项目(2009-4-51);湖南省高校产业化项目(11cy027);国家"十一五"科技支撑计划(2008BADA9B0102)

摘　　要：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 fibres （WF） were esterified with maleie anhydride （MA） in a mixing chamber. Then the esterified WF （EWF）, HDPE and dicumyl peroxide （DCP） were compounded to prepare EWF/HDPE composites through reactive extrusion. The mechanical properties and microstructures of the composites were investigated by Fourier transform infrared spectroscopy （FTIR）, mechanical test, scanning electron microscopy （SEM）, wide angle X- ray diffraction （WAXD） and simultaneous thermogravimetry differential scanning calorimetry （TG- DSC）. The results show that, the ester group is successfully introduced onto the WF via the dry process. In comparison with the WF/HDPE composite without compatibilization, EWF/HDPE composites by reactive extrusion show an increase of 1120% and 36 % in tensile and impact strength respectively. A significantly improved interfacial adhesion, an increase in the crystalline size and crystallinity, but a slight decrease in thermo - stability are also observed for the reactively extruded composites. The mechanism of the reactive extrusion is discussed. It is suggested that the increase in mechanical properties of the composites is mainly contributed to the compatibilization by reactive extrusion, rather than alterations in the crystal structure of HDPE matrix.

关 键 词：高密度聚乙烯(HDPE) 木纤维 复合材料 反应挤出 增容 

分 类 号：TB332[一般工业技术—材料科学与工程]