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首页> 外文期刊>Journal of Applied Polymer Science >A study on the effects of SEBS-g-MAH on the phase morphology and mechanical properties of polypropylene/polycarbonate/SEBS ternary polymer blends
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A study on the effects of SEBS-g-MAH on the phase morphology and mechanical properties of polypropylene/polycarbonate/SEBS ternary polymer blends

机译：SEBS-g-MAH对聚丙烯/聚碳酸酯/ SEBS三元聚合物共混物的相形态和力学性能的影响

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摘要

In this work, five ternary blends based on 70% by weight (wt %) of polypropylene (PP) with 30% wt of polycarbonate (PC)/poly(styrene-b-(ethylene- co-butylene)-b-styrene)(SEBS) dispersed phase consists of 15 wt % PC and 15 wt % reactive (maleic anhydride grafted) and nonreactive SEBS mixtures at various ratios were prepared in a co-rotating twin screw extruder. scanning electron microscopy (SEM) micrographs showed that the blends containing only nonreactive SEBS exhibited a fine dispersion of core-shell particles. With decreasing the SEBS/SEBS-g-Maleic Anhydride (MAH) weight ratio, the morphology changed from the core-shell particles to a mixed of core-shell, rod-like and individual particles. This variation in phase morphology affected the thermal and mechanical properties of the blends. DSC results showed that the blends containing only nonreactive SEBS exhibited a minimum in degree of crystallinity due to the homogeneous nucleation of core-shell particles. Mechanical testing showed that in the SEBS/SEBS-g-MAH weight ratio of 50/50, the modulus and impact strength increased compared with the PP matrix while the yield stress had minimum difference with that of PP matrix. These effects could be attributed to the formation of those especial microstructures revealed by the SEM studies.
机译：在这项工作中，基于70％重量（wt％）的聚丙烯（PP）和30％wt的聚碳酸酯（PC）/聚（苯乙烯-b-（乙烯-共丁烯）-b-苯乙烯）的五元共混物（SEBS）分散相由15 wt％的PC和15 wt％的反应性（接枝马来酸酐）组成，并且在同向旋转双螺杆挤出机中制备了各种比例的非反应性SEBS混合物。扫描电子显微镜（SEM）显微照片显示，仅包含非反应性SEBS的共混物显示出核-壳颗粒的精细分散。随着SEBS / SEBS-g-马来酸酐（MAH）重量比的降低，形态从核-壳颗粒变为核-壳，棒状和单个颗粒的混合。相形态的这种变化影响了共混物的热和机械性能。 DSC结果表明，由于核-壳颗粒的均匀成核，仅包含非反应性SEBS的共混物表现出最小的结晶度。机械测试表明，在SEBS / SEBS-g-MAH重量比为50/50时，模量和冲击强度与PP基体相比有所增加，而屈服应力与PP基体的差异最小。这些影响可能归因于SEM研究揭示的那些特殊的微观结构的形成。

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