论文部分内容阅读
采用2种不同的增容剂对PP/PA共混体系进行增容:PP与马来酸酐的接枝共聚物PP-g-MAH和接枝改性的热塑性弹性体TPE-g.并对它们应变率从10-4 s-1到103 s-1范围内的力学性能进行了研究.试验结果表明:采用PP-g-MAH作增容剂的PP/PA两元体系,在高应变率冲击条件下,界面损伤演化加速,应变约6％时即发生宏观应力应变曲线软化,应变率约2 000 s-1,应变约23％时即发生剪切破坏.采用TPE-g界面相容剂的PP/PA两元体系,由于形成分散相为核,界面相客荆为柔性壳的核壳结构,在尼龙粒子及壳层的协同作用下,使该共混体系的韧性得到大幅度提高.该体系在应变率高于3 500 s-1,应变约45％时才发生剪切破坏.断裂时单位体积吸收能量大幅度提高.
Two different compatibilizers were used to compatibilize PP / PA blends: PP-g-MAH, a graft copolymer of PP and maleic anhydride, and TPE-g, a graft modified thermoplastic elastomer The results show that PP / PA binary system with PP-g-MAH as compatibilizer can improve the mechanical properties at high strain rate Under the conditions of accelerated interface damage evolution, about 6% strain occurs when the macro-stress-strain curve softening, the strain rate of about 2 000 s-1, about 23% of the strain shear failure occurs when the use of TPE-g interface compatibilizer PP / PA binary system, due to the formation of dispersed phase as the core, the interface phase Jing off as flexible shell core-shell structure, the nylon particles and the shell under the synergies, so that the toughness of the blend system is greatly improved. The shear failure occurs when the strain rate is higher than 3 500 s-1 and the strain is about 45%, and the energy absorbed per unit volume at fracture greatly increases.