【摘要】 本文对热致液晶聚合物(TLCP)/玻璃纤维(GF)/聚丙烯(PP)原位混杂复合材料的形态结构、破坏过程、力学性能进行了研究.显微镜的观察结果表明, TLCP的加入使得加工过程中玻纤的破断减弱. TLCP/GF/PP原位混杂复合材料中GF的平均长度是GF/PP复合材料的2.36倍,这使其主承载作用更显著.使用带拉伸实验台的扫描电镜观察到了TLCP微纤或微球对微裂纹扩展的阻滞及延缓作用. TLCP/GF/PP(5/15/85)样品拉伸强度及断裂伸长率分别比GF/PP(15/85)样品提高了22.6％和321％.PP-g-MAH的加入使得原位混杂复合材料的拉伸强度进一步得到提高.更多还原

【Abstract】 The morphology, structure, fracture behavior and mechanical properties of TLCP/GF/PP in-situ hybrid composites were investigated. The addition of TLCP minimized the breakage of glass fibers during melt processing. Statistical results of solvent extracted samples indicated that the average length of GF in TLCP/GF/PP in-situ hybrid composite is 2.36 times of that in GF/PP composite, resulting in more significant main load-bearing role. The fracture process observed by SEM with a dynamic tensile stage showed that the dispersed phase of TLCP could delay and block the propagation of microcracks. The tensile strength and elongation at breakage of TLCP/GF/PP5/15/85 were 22.6% and 321%, respectively , higher than that of GF/PP15/85. The tensile strength of in-situ hybrid composite was improved further when using PP-g-MAH as the coupling agent and compatibilizer.更多还原