相反转工艺制备聚苯乙烯/聚酯共混物微球

摘要

通过相反转工艺制备了聚苯乙烯/聚酯共混物微球,采用差示扫描量热仪、扫描电子显微镜、粒度分析仪研究了共混物微球的玻璃化转变温度、微观形貌、粒径等,分析了分散剂、表面活性剂、搅拌速率对共混物微球粒径及其分布的影响.结果表明:共混物微球具有两个玻璃化转变温度,与聚苯乙烯和聚酯的玻璃化转变温度相比,共混物微球的两个玻璃化转变温度相互靠近;聚酯和聚苯乙烯构成不相容体系,但二者链段间具有部分相容性;共混物微球表面粗糙;聚乙烯醇可有效减缓聚合过程中单体相粒子间发生聚并;微球粒径随表面活性剂用量、搅拌速率增加而减小,且粒径分布变窄.%Blend microspheres of polystyrene-polyester were prepared via phase inversion process. The glass transition temperatures(tg),morphology and particle size of the blend microspheres were observed by differential scanning calorimeter,scanning electron microscope and particle counter. The effects of dispersing agent,surfactant and stirring speed on particle size and size distribution of microspheres were analyzed. The results show that the blend microspheres have two closetg compared with thatof polystyrene and polyester. The polyester and polystyrene form immiscible blend while their chains are partially compatible with each other. The surface of microsphere is rough. The addition of polyvinyl alcohol can prevent effectively blend microspheres from coalescing during polymerization. The particle size of the microspheres decreases with the increasing of the surfactants or stirring speed,the size distribution narrows correspondingly.