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为了提高剑麻纤维与聚碳酸亚丙酯(PPC)的界面作用力,用硅烷偶联剂KH550对剑麻纤维进行表面预处理,在剑麻纤维和PPC熔融共混时,加入异氰酸酯预聚物(PUP)进行反应性共混改性。通过FTIR、TGA、SEM、拉伸测试等手段对剑麻纤维/PUP/PPC复合体系进行表征,研究加入PUP对复合材料微观相界面性质及宏观性能的影响。结果表明,经KH550硅烷偶联剂处理并加入PUP后,PPC与剑麻纤维在熔融共混时发生原位增容反应,复合材料的两相界面黏结性得到明显改善,显著提高了材料的力学性能。同时,PUP与剑麻纤维存在一定协同效应,使得材料的耐热稳定性得到较大改善。
In order to improve the interfacial interaction between sisal fiber and poly propylene carbonate (PPC), the surface of sisal fiber was pretreated with a silane coupling agent KH550. When sisal fiber and PPC were melt-blended, an isocyanate prepolymer (PUP) for reactive blend modification. The sisal fiber / PUP / PPC composites were characterized by means of FTIR, TGA, SEM, tensile test and so on. The effects of PUP on the interfacial properties and macroscopical properties of composites were investigated. The results show that the PPC and sisal fibers undergo in situ compatibilization reaction after KH550 silane coupling agent is added into PUP, the cohesiveness of the two phases of the composite material is obviously improved, and the mechanical properties of the material are significantly improved performance. At the same time, there is a certain synergistic effect between PUP and sisal fiber so that the thermal stability of the material is greatly improved.