高校化学工程学报2016，Vol.30Issue(5)：1171-1177,7.DOI:10.3969/j.issn.1003-9015.2016.00.029
发泡剂存在下甲基丙烯酸甲酯悬浮聚合制备热膨胀微球
Preparation of Thermally Expandable Microspheres by Methyl Methacrylate Suspension Polymerization Assisted with a Foaming Agent
谢贵明 1包永忠1
作者信息
- 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，浙江 杭州 310027
- 折叠
摘要
Abstract
Poly(methyl methacrylate) (PMMA) thermally expandable microspheres were prepared by methyl methacrylate suspension polymerization using pentane as a foaming agent. The evolution of average size and morphology of PMMA microspheres during suspension polymerization were monitored with an on-line laser particle size analyzer and an optical microscope, respectively. The thermal expansion performance of the microspheres was also characterized. The results show that polymerization temperature has a great influence on the evolution of average size and microsphere morphology in the presence of pentane. When the polymerization temperature (70℃) is much higher than the boiling point of pentane, the variation of average size exhibits typical feature of suspension polymerization with transition, quasi-steady state, growth and identification stages as polymerization time (conversion) increases, but the morphology and thermal expansion property of the microsphere are poor due to the imperfect core-shell structure. When the polymerization temperature (50℃) is closed to the boiling point of pentane, the particle growth stage is not obvious. The obtained microspheres exhibits proper core-shell structure and excellent thermal-expansion performance with an expandable temperature range of 60℃ (the onset expansion temperature is 95℃ and the onset shrinkage temperature is 155℃) and a volume expansion ratio of 56.关键词
甲基丙烯酸甲酯/悬浮聚合/热膨胀微球/发泡剂/粒径/形貌Key words
methyl methacrylate/suspension polymerization/thermally-expandable microspheres/blowing agent/particle size/morphology分类
化学化工引用本文复制引用
谢贵明,包永忠..发泡剂存在下甲基丙烯酸甲酯悬浮聚合制备热膨胀微球[J].高校化学工程学报,2016,30(5):1171-1177,7.
