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首页> 外文期刊>Journal of Applied Polymer Science >Toughened polystyrene with improved photoresistance: Effects of the compatibilizers
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Toughened polystyrene with improved photoresistance: Effects of the compatibilizers

机译：增韧的聚苯乙烯增韧剂：增容剂的作用

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The dispersion of ethylene-propylene-diene terpolymer (EPDM) rubber in a polystyrene (PS) matrix is an alternative for improving the weathering resistance of high-impact polystyrene (HIPS), which commonly contains polybutadiene as an impact modifier. However, EPDM and PS are immiscible, and compatibilizers are required to improve the final properties. In this study, EPDM-PS blends were prepared by melt mixing, and the compatibilizing effects of two block copolymers on these blends was studied. The materials were analyzed by scanning electron microscopy, tensile and impact tests, and exposure to UV light for 20 days. The addition of styrene-butadiene-styrene block copolymer (SBS) and styrene-ethylene-co-butylene-styrene block copolymer (SEBS) improved the dispersion of EPDM in the PS matrix. The compatibilized blends showed lower tensile properties, but an important increase in the impact strength was observed compared to the noncompatibilized blend. With regard to the impact strength, SBS was more effective than SEBS as a compatibilizer. All of the blends showed higher UV resistances than the commercial HIPS, and the best performance was observed in the blends compatibilized with SEBS. These results are discussed and explained in terms of the blends' morphologies and chemical compositions.
机译：乙烯-丙烯-二烯三元共聚物（EPDM）橡胶在聚苯乙烯（PS）基质中的分散是提高高抗冲聚苯乙烯（HIPS）的耐候性的一种替代方法，该抗冲聚苯乙烯通常包含聚丁二烯作为抗冲改性剂。但是，EPDM和PS是不相容的，因此需要增容剂来改善最终性能。在这项研究中，通过熔融混合制备了EPDM-PS共混物，并研究了两种嵌段共聚物对这些共混物的增容作用。通过扫描电子显微镜，拉伸和冲击测试以及暴露于紫外线20天来分析材料。苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）和苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物（SEBS）的添加改善了EPDM在PS基体中的分散性。相容的共混物显示出较低的拉伸性能，但是与未相容的共混物相比，观察到冲击强度的重要增加。关于冲击强度，SBS作为增容剂比SEBS更有效。所有共混物均显示出比市售HIPS更高的抗紫外线性，并且在与SEBS相容的共混物中观察到最佳性能。根据共混物的形态和化学组成讨论和解释了这些结果。

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