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化工学报  2015 

水相添加剂对热可膨胀聚合物微球颗粒结构和膨胀特性的影响

DOI: 10.11949/j.issn.0438-1157.20150489, PP. 4682-4688

Keywords: 聚合,粒子,粒度分布,热可膨胀聚合物微球,水相添加剂

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Abstract:

通过戊烷发泡剂存在下的偏氯乙烯-丙烯腈-甲基丙烯酸甲酯(VDC-AN-MMA)悬浮共聚制备包覆型热可膨胀聚合物微球,考察氯化钠、柠檬酸和重铬酸钾等水相添加剂对聚合物微球颗粒结构和热膨胀特性的影响。结果表明氯化钠、柠檬酸和重铬酸钾的添加均可起到降低聚合过程中形成难膨胀聚合物细微粒子的作用,当氯化钠添加量为4%(质量分数,基于单体,下同)、柠檬酸添加量为2.5%~5.0%、重铬酸钾添加量为0.05%~0.1%时,制备的可膨胀聚合物微球具有粒径分布窄、形态规整、聚合物对发泡剂包覆效果好等特点;加热后未膨胀聚合物微粒数目少,膨胀均匀,膨胀温度区间宽。

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