ABS-g-GMA增韧聚对苯二甲酸丁二醇酯的研究

ABS-g-GMA Toughened Poly (butylene terephthalate)

用甲基丙烯酸环氧丙酯(GMA)接枝的丙烯腈/丁二烯/苯乙烯(ABS)接枝共聚物(ABS-g-GMA)改善聚对苯二甲酸丁二醇酯(PBT)的缺口冲击韧性。动态力学分析、差示扫描量热分析以及流变性能测试结果表明,GMA引入到ABS中,随GMA含量的增加,PBT与ABS的玻璃化转变温度相互靠近,PBT的熔点降低,共混体系的扭矩、温度提高,这些结果表明GMA提高了PRT与ABS之间的相容性;增容反应导致ABS在PBT基体中均匀、稳定分散,有利于共混物性能的改善;交联反应导致交联聚集网状结构的生成,使共混物性能变差。冲击强度结果表明,1％(质量含量,下同)GMA含量就可以导致PBT／ABS-g-GMA共混物冲击韧性显著改善,当ABS-g-GMA1含量为30％时, 共混物冲击强度高达850 J/m。

Glycidyl methacrylate （GMA） functionalized acrylonitrile-butadiene-styrene core-shell copolymers （ABS-g-GMA） have been used to improve the impact strength of poly （butylene terephthalate） （PBT）. DMA, DSC and rheological tests showed PBT/ABS-g-GMA blends exhibited two Tg, and the Tm of PBT shifted to lower temperature. The torque of the blends increased with increasing GMA content. These results showed that the introduction of GMA improved the compatibility between PBT and ABS. Compatibilization reaction is beneficial to the dispersion of minor phase, while crosslinking reaction induces crosslinking net structure. Notched Izod impact tests showed that 1 wt % GMA on ABS was sufficient to improve the impact toughness of PBT blends and the maximum toughness of 850 J/m was achieved when 30 wt % ABS-g-GMA1 was added.