纳米SiO_2修饰玻纤表面对玻纤/聚丙烯复合材料界面性能的影响

The effect of nano-silica modified glass fiber on the interfacial properties of glass fiber / PP composites

借助纳米颗粒的高比表面积特性,将纳米二氧化硅通过化学接枝方法修饰玻璃纤维表面,制备玻璃纤维/聚丙烯(PP)热塑复合材料。通过SEM表征纳米二氧化硅在玻璃纤维表面的分布形态,结果表明纳米颗粒在纤维表面分散良好;通过界面剪切强度测试(IFSS)和界面断裂韧性测试(G_(ⅡC))表征复合材料界面的静态力学性能,结果显示材料的界面剪切强度与界面断裂韧性同时获得了较大的提升;动态热机械分析测试(DMA)的结果表明复合材料在动态测试下的综合界面结合性能均得到较大的提升。

Taking advantage of the high specific surface area of nanoparticles,nano-silica was directly introduced onto the surface of a glass fiber by chemical grafting,and modified glass fiber / PP composites were then fabricated using a film stacking procedure. The surface topography of the modified glass fibers and the distribution of nano-silica were invesgated by scanning electron microscopy（ SEM）; the results showed that the nanoparticles are well dispersed on the surface of the fibers. The interfacial shear strength（ IFSS） and interfacial fracture toughness（ GⅡC）of modified glass fiber / PP composites were improved significantly after incorporation of nano-silica. The dynamic mechanics of the interface bonding properties was studied by dynamic mechanical analysis（ DMA）,and the results showed that the modified glass fiber / PP composites have optimal comprehensive bonding properties.