PBT/ASA共混体系相形态及流变性能研究

通过熔融共混技术将丙烯腈苯乙烯丙烯酸酯三元共聚物(ASA)对聚对苯二甲酸丁二醇酯(PBT)进行了增韧改性，并采用扫描电子显微镜、动态流变分析仪观察研究了PBT/ASA共混体系的相形态和流变行为。结果表明，ASA可有效增加PBT共混体系的熔体强度，所形成的PBT/ASA共混物为部分相容体系；体系的相容性具有一定的组分依赖性，当ASA含量较低时，共混体系为典型的“海岛”结构，而当ASA含量为40 %～60 %（质量分数，下同）时体系发生了相翻转，该结果与4个预测相翻转的模型中HoRM模型计算得到的相翻转点ASA含量为62.2 %接近。

Study on Phase Morphology and Rheological Behavior of PBT/ASA Blends

Acrylonitrile styrene acrylates terpolymer(ASA) was employed to toughen polybutylene terephthalate (PBT). Scanning electron microscope (SEM) and dynamic rheometer were used to investigate the phase morphology and rheological property of PBT/ASA blends. It was clear that ASA could effectively improve the melt strength of PBT, and the PBT/ASA blend was a partly compatible system with compositon dependence. The microphase of the blends showed a typical “sea island” structure at low ASA content, and a phase inversion occurred in an ASA content range of 40 wt %～60 wt%.