聚氨酯和蒙脱土协同增韧增强环氧树脂

Synergistic effect of polyurethane and organophilic montmorillonite on toughening and reinforcing epoxy resin

采用聚合物互穿技术与原位插层聚合相结合的方法制备了有机蒙脱土修饰的环氧树脂／聚氨酯互穿网络纳米复合材料．傅立叶红外光谱,X射线衍射及透射电镜分析表明剥离或插层的蒙脱土片层表面羟基能与环氧树脂／聚氨酯基体发生交联反应,并且均匀分散在环氧树脂／聚氨酯基体中．力学性能测试结果表明聚氨酯,蒙脱土的加入同时增加了环氧树脂的拉伸强度和断裂韧性．扫描电镜分析表明聚氨酯和蒙脱土协同增韧增强环氧树脂的主要原因为剪切屈服和微裂纹增韧．

Epoxy resin/polyurethane interpenetrating polymer network nanocomposites with various contents of polyurethane and organophilic montmorillonite（oMMT） were prepared by a sequential polymeric technique and in situ intercalation method. The analysis showed that oMMT interacted with epoxy resin/polyurethane interpenetrating polymer networks （IPNs）. oMMT dispersed uniformly in epoxy resin/polyurethane IPNs, and formed the intercalated or exfoliated microstructures in the matrix. Mechanical properties tests indicated that oMMT and the IPNs of EP and PU exhibited synergistic effect on improving tensile strength and critical stress intensity factor of pure EP. Scanning electronic microscope observations prove that cavities and micro-cracks are responsible for improving toughness and strength of EP nanocomposites modified by polyurethane and oMMT.