谢贵明,包永忠

• 1:化学工程联合国家重点实验室(浙江大学)浙江大学化学工程与生物工程学院

摘要(Abstract)：

通过戊烷发泡剂存在下的甲基丙烯酸甲酯(MMA)悬浮聚合方法制备热膨胀聚甲基丙烯酸甲酯(PMMA)微球,利用在线激光粒度分析仪和光学显微镜观察聚合过程中PMMA微球粒径和形貌的变化,并对微球的热膨胀性能进行分析。结果表明,存在戊烷发泡剂时,聚合温度对微球粒径及形貌变化的影响显著,当聚合温度(70℃)远高于戊烷沸点时,微球粒径变化存在悬浮聚合成粒的典型特征阶段(转变、准稳态、增长和恒定阶段),但最终微粒形貌较差,核-壳结构不完善,导致微球热膨胀性能不佳。当聚合温度(50℃)接近戊烷沸点时,聚合过程微球粒径增长阶段不明显,粒子表面光滑且核-壳结构完善,微球的热膨胀性能良好,稳泡温程为60℃(起始发泡温度为95℃,收缩温度为155℃),体积膨胀率达56倍。

关键词(KeyWords)： 甲基丙烯酸甲酯;悬浮聚合;热膨胀微球;发泡剂;粒径;形貌

Abstract:

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基金项目(Foundation):

作者(Author): 谢贵明,包永忠

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