Toughening of poly(2,6-dimethyl-1,4-phenylene oxide)/nylon 6 alloys with functionalized elastomers via reactive compatibilization: morphology, mechanical properties, and rheology
Toughening of poly(2,6-dimethyl-1,4-phenylene oxide)/nylon 6 alloys with functionalized elastomers via reactive compatibilization: morphology, mechanical properties, and rheology
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DOI：
10.1016/j.eurpolymj.2004.01.004
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发表时间：
2004-06
影响因子：
6
通讯作者：
Dezhen Wu;Xiaodong Wang;R. Jin
中科院分区：
文献类型：
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作者：
Dezhen Wu;Xiaodong Wang;R. Jin
以三元乙丙橡胶（EPDM）接枝马来酸酐（MA）（EPDM-g-MA）、三元乙丙橡胶接枝甲基丙烯酸缩水甘油酯（EPDM-g-GMA）和苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物（SEBS-g-MA）为基体，采用熔融挤出法制备了聚（2，6-二甲基-1，4-苯醚）/尼龙6共混物，研究了共混物的形态结构、力学性能和流变性能。DSC分析表明，官能化弹性体对PPO/尼龙6合金具有增容作用，缺口冲击强度的显著提高证实了这一点。EPDM在PPO/尼龙6基体中的分散性和粒径的减小以及SEBS-g-MA微区在基体中形成的网络结构是增韧的主要原因。当EPDM的MA或GMA接枝率变化时，共混物的缺口冲击强度均出现最佳值，比未增韧的合金高一个数量级。形态结构表明，随着MA或GMA接枝率的增加，EPDM粒子尺寸减小。流变学研究表明，EPDM上的MA或GMA结构部分与尼龙6的胺基发生反应，增加了尼龙6的分子量和支化度，从而导致共混物的粘度增加。这证明了官能化EPDM与PPO/尼龙6基体之间的反应增容作用。
Blends of poly(2,6-dimethyl-1,4-phenylene oxide)/nylon 6 alloys based on ethylene-propylene-diene elastomer (EPDM) grafted with maleic anhydride (MA) (EPDM-g-MA), EPDM grafted with glycidyl methacrylate (EPDM-g-GMA), and styrene-ethylene-butadiene-styrene block copolymer grafted with MA (SEBS-g-MA) were prepared via melt extruction, and morphology, mechanical properties, and rheology were studied. The compatibilizing effects of functionalized elastomers on the PPO/nylon 6 alloys were proved by DSC analysis and confirmed by the significant improvement in the notched Izod impact strength. Toughening was resulted from the smaller particle size and finer dispersion of EPDM in the PPO/nylon 6 matrix as well as a novel network structure of SEBS-g-MA domain in matrix. The notched Izod impact strength of the blends exhibited an optimum value when the extent of MA or GMA graft ratio of EPDM varied, which was an order of magnitude higher than the non-toughened alloys. The morphology revealed that the size of EPDM particles decreased with an increase in graft ratio of MA or GMA onto EPDM. Rheology investigation indicated that the MA or GMA moieties on EPDM reacted with the amine groups of nylon 6, which increased the molecular weight and the degree of branching, and thus resulted in an increase in the viscosity of the blends. This proved the reactive compatibilization between functionalized EPDM and PPO/nylon 6 matrix.