聚环氧酯的合成及其对PC/ABS相容性的影响

以双酚A环氧树脂和己二酸合成了聚己二酸环氧酯，将环氧酯作为相容剂加入到PC/ABS中通过双螺杆挤出机并注射成型制备了合金，与马来酸酐接枝聚苯乙烯（SMA）相容剂增容的合金的力学性能及分散形态进行了对比。结果表明，聚环氧酯对PC相具有良好的相容性，而SMA对ABS相的相容性较好，二者复合使用可以显著改善合金的相容性；聚环氧酯能明显提高PC/ABS合金的拉伸强度和缺口冲击强度，但过量加入会降低合金的冲击强度；SEM结果表明少量的聚环氧酯即可以使ABS分散相分布均匀，与SMA并用可以使分散相尺寸减小，提高相容性。

Synthesis of poly(epoxy ester) and its effect on the compatibility of PC/ABS blends

Poly(epoxy ester) was synthesized by bisphenol A epoxy and adipic acid, and it was added to the PC/ABS blends as a new compatilizer. PC/ABS blends with the compatilizer was processed by twin-screw extruder and injection molding machine. The compatibility of the poly(epoxy ester) was evaluated by DSC, SEM and mechanical property, and compared with maleic anhydride grafted polystyrene(SMA). The results showed that the poly(epoxy ester) had a better compatibility with PC, while SMA had a better compatibility with ABS. Poly(epoxy ester) and SMA added into PC/ABS blends simultaneously could significantly improved the compatibility of PC/ABS alloy. The content of poly(epoxy ester) at a low level could led to significant increase in both notched impact strength and tensile strength. The notched impact strength dramaticly decreased with excess poly(epoxy ester) addition. SEM showed that the poly(epoxy ester) compatilizer made the ABS disperse evenly. The size of ABS domains in PC/ABS blends was reduced when the two kinds of compatilizer used simultaneously. The compatibility of PC/ ABS blends was improved correspondingly.