增容剂对竹纤维/聚己内酯复合材料的界面增容及性能改善

摘要

以过氧化二异丙苯为引发剂,甲基丙烯酸缩水甘油酯(GMA)为单体,通过熔融反应制备了聚己内酯(PCL)接枝甲基丙烯酸缩水甘油酯(PCL-g-GMA),用傅里叶红外光谱(FTIR)和核磁共振氢谱(1H-NMR)表征了接枝物的化学结构,并以PCL-g-GMA为增容剂,考察了其添加对竹纤维/聚己内酯(BF/PCL)复合材料结构与性能的影响.研究结果表明,FTIR和1H-NMR分析结果证实了GMA已成功接枝到PCL上.PCL-g-GMA添加后,竹纤维与PCL的界面相容性得到明显改善,复合材料力学性能显著提升,吸水率下降.在PCL-g-GMA添加质量分数为10％时,复合材料拉伸强度、断裂伸长率比未增容BF/PCL复合材料分别增大了80％和70％.%Polycaprolactone-graft-glycidyl methacrylate(PCL-g-GMA) was synthesized by blending the melted PLA with GMA with dicumyl peroxide as initiator. The grafting copolymer was characterized by FTIR and 1H-NMR spectroscopic analyses. The effect of PCL-g-GMA addition on the structure and properties of bamboo fiber/polycaprolactone composite was investigated. The result showed that:the GMA was successfully grafted onto polycaprolactone,which was confirmed by FTIR and 1H-NMR spectroscopic analyses. The interfacial compatibility,mechanical and water absorption properties were greatly improved by PCL-g-GMA. When 10％ content of PCL-g-GMA was addied,the bamboo fiber/polycaprolactone composite showed optimal mechanical properties,with an improvement of 80％ in tensile strength and 70％ in elongation at break,compared to those without PCL-g-GMA.