CAJ | 학술논문

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10-4s-1到10 3s-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 000s-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,界面相容剂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 500s-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.
채용2충불동적증용제대PP/PA공혼체계진행증용:PP여마래산항적접지공취물PP-g-MAH화접지개성적열소성탄성체TPE-g.병대타문응변솔종10-4s-1도10 3s-1범위내적역학성능진행료연구.시험결과표명:채용PP-g-MAH작증용제적PP/PA량원체계,재고응변솔충격조건하,계면손상연화가속,응변약6%시즉발생굉관응력응변곡선연화,응변솔약2 000s-1,응변약23%시즉발생전절파배.채용TPE-g계면상용제적PP/PA량원체계,유우형성분산상위핵,계면상용제위유성각적핵각결구,재니룡입자급각층적협동작용하,사해공혼체계적인성득도대폭도제고.해체계재응변솔고우3 500s-1,응변약45%시재발생전절파배.단렬시단위체적흡수능량대폭도제고.
Two different kinds of eompatibilizers were used for PP/PA polymer blends: polypropylene grafted with maleic anhydride (PP-g-MAH) and thermoplastic elastomer grafted with maleic anhydride (TPE-g). The dynamic mechanical behavior of these two binary polymer blends at strain rate ranging from 1 × 10-4 ～ 1 × 103 s-1 was studied. The experimental results show that at high strain rate for PP/PA/PP-g-MAH the damage evolution process of interface between the minor disperse phase and the matrix was accelerated. When its strain reaches about 6%, the stress softening of its stress strain curve is observed. Its shearing failure happens at strain about 23 % under the strain rate of 2 000 s-1. For PP/PA/ TPE-g situation, the compatibilizer TPE-g forms a soft shell around a small core of the second minor phase PA. Under the synergetic action of the fining PA particles and the flexible shell, the toughness of the binary blends with core-shell structure is enhanced obviously. Its shearing failure strain is increased as high as to 45 % under the strain rate 3 500 s- 1 and its absorbed fracture energy for unit volume is raised remarkably.