PA6／PP共混复合材料的压力诱导流动成型的微观结构和力学性能研究

Study on Mechanical Properties and Micro-morphology of PA6／pp Composites Obtained by Pressure-induced Flow Processing

本文研究了压力诱导流动成型对用普通方法注塑的PA6＼PP共混复合材料的微观结构和力学性能的影响。SEM结果表明压力诱导流动可以使PA6＼PP共混复合材料形成微观片层结构，该结构由较软的无定形区相联的交互层叠片层构成，类似于自然界贝壳结构。力学性能测试表明该结构可以大幅度提高PA6＼PP共混复合材料的力学性能，特别是缺口冲击强度由4．33KJm。提高到压力诱导流动成型后的40．51KJ／m^2，而且有应力一应变曲线可以明显的看出材料出现了二次屈服。DMA测试表明，经过PIF成型的样品在扫描范围内的任何温度下，都表现出比成型前样品更高的储能模量。

Macro-properties and micro-morphology of Pa6／pp composites obtained by pressure-induced flow processing were investigated by impact test. SEM images show that micro-sheet structure can be formed via this process, which is made up of interlocking sheet separated by soft amorphous region. And mechanical properties of Pa6／pp composites were greatly enhanced by formation of this micro-sheet structure. For example, notched impact strength of Pa6／pp composites could be achieved to about 40.51KJ/m^2 , with respect to 4.3KJ/m^2 for virgin Pa6／pp composites. From the stress-strain curves of the specimens we can find an obvious cross-over takes place near the yield point of unprocessed specimen while a new yield point occurs at a tensile stress much higher than the original yielding strength. Result of DMA testing indicates at any different temperature after PlF-processing all represent much higher storage modulus than unformed samples.