SEBS-g-MAH增容PS/PC体系的结构与力学性能

Structure and Mechanical Properties of PS/PC/SEBS-g-MAH Blends

研究了不同配比的聚苯乙烯/聚碳酸酯(PS/PC)共混体系的结构与力学性能及彼此之间的关系,讨论了增容剂氢化苯乙烯-丁二烯共聚物接枝马来酸酐(SEBS-g-MAH)对共混物相容性及力学性能的影响。差示扫描量热分析表明,PS/PC表现出2个玻璃化转变温度(Tg),而PS/PC/SEBS-g-MAH则只有1个Tg。扫描电镜的分析结果表明,PS为连续相,PC为分散相,而且SEBS-g-MAH的加入使PS与PC的界面变得模糊。可见增容剂对共混体系具有明显的增容作用。共混物的冲击强度在PC用量大于30 phr时明显提高,拉伸强度和冲击强度在低PC含量时较纯PS有一定程度的下降,但随PC含量增加又逐渐提高;增容共混物的力学性能比未增容的有较大提高;当PC用量约40 phr时共混物具有最好的综合性能。

The structure and mechanical properties of polystyrene （PS）/ polycarbonate （PC） blends with different compositions were studied, and the effect of SEBS-g-MAH on compatibility and mechanical properties of PS/PC blends was discussed. The results of differential scanning calorimetry show that there are two Tg in PS/PC blends, while only one Tg in PS/PC/SEBS-g-MAH blends. Photos of scanning electron microscopy show that PS forms the continuous phase and PC is dispersed as spherical particles in the PS matrix; the interfaces of PS and PC become fuzzy with the addition of SEBS-g-MAH, which means that the compatibility of PS/PC blends is improved obviously with the addition of SEBS-g-MAH. The notch impact strength of blends is improved a lot when the content of PC is above 30 phr. The flexure strength and tensile strength of blends are lower than those of pure PS, and they are enhanced with the amount of PC increasing. The notch impact strength, flexure strength and tensile strength of PS/PC blends are markedly increased with the addition of SEBS-g-MAH. The comprehensive properties of the blends are the best with adding 40 phr PC.