采用熔融共混法制备了尼龙6/马来酸酐接枝苯乙烯-乙烯-丁烯-苯乙烯共聚物/聚苯醚(PA6/SEBS-g-MA/PPO)共混物,研究了PPO在PA6/SEBS-g-MA/PPO共混物中的作用.通过扫描电镜(SEM)和摆锤冲击仪分别研究了PPO的用量对PA6/SEBS-g-MA/PPO共混物的形貌结构和缺口冲击强度的影响.通过接触角法测量得到共混物各个组分的表面能,并计算出各组分间的界面张力.在界面张力和铺展系数的作用下,PA6基体中形成以PPO为核,SEBS-g-MA为壳的"核壳结构"粒子.冲击测试表明,"核壳结构"粒子对PA6的增韧发挥主要作用.在一定范围内,随PPO用量的增加,形成的"核壳结构"粒子数增加,PA6/SEBS-g-MA/PPO共混物的冲击强度先增大后减小.%Blends of polyamide-6 (PA6)/styrene-ethylene-butadiene-styrene block copolymer grafted with maleic anhydride (SEBS-g-MA) /poly (phenylene oxide) (PPO) were prepared via melt blending, and toughening effects of PPO in PA6/SEBS-g-MA/PPO blends was discussed. The effects of PPO contents on the morphology and notched Izod impact strength of PA6/SEBS-g-MA/PPO blends were studied by scanning electron microscopy (SEM) and pendulum impact tests. Surface energies of PA6, SEBS-g-MA and PPO were measured by contact angle measurements, which were used to calculate interfacial tension between each other."Core-shell" particles with PPO (core) and SEBS-g-MA (shell) were formed in PA6 matrix driven by interfacial tension and spreading coefficient. Impact test results indicate that the "core-shell" particles play a key role in toughening PA6 blends. With the increase of PPO content within a certain range, the number of "core-shell"particles increases and the impact strength increases first and then decreases.
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