化学学报 ›› 2009, Vol. 67 ›› Issue (7): 665-670. 上一篇    下一篇

研究论文

悬浮聚合制备大粒径磁性聚甲基丙烯酸甲酯微珠: 反应参数对微珠粒径的影响

杜海燕 张军华*

  

  1. (四川大学高分子研究所 高分子材料工程国家重点实验室 成都 610065)

  • 收稿日期:2008-07-10 修回日期:2008-09-25 出版日期:2009-04-14 发布日期:2009-04-14
  • 通讯作者: 张军华

Magnetic Poly(methyl methacrylate) Particles Prepared by Suspension Polymerization: Effect of Reaction Parameters on Particle Sizes

Du, Haiyan Zhang, Junhua*   

  1. (State Key Laboratory of Polymer Materials Engineering of China, Sichuan University, Chengdu 610065)
  • Received:2008-07-10 Revised:2008-09-25 Online:2009-04-14 Published:2009-04-14
  • Contact: Zhang, Junhua

采用低速搅拌悬浮聚合制得了一系列磁性聚甲基丙烯酸甲酯(PMMA)微珠. 分别以聚乙烯醇(PVA 1788)和碱式碳酸镁作为稳定剂和助分散剂, Fe3O4磁流体为磁性物质, 双甲基丙烯酸甲酯为交联剂. 所有粒子的直径在1~3 mm 范围内, 微球的粒径及其分布可以通过改变聚合反应介质来进行调节. 着重研究了反应体系中电解质的用量、聚合反应温度、水油比、碱式碳酸镁及交联剂的用量等反应参数对微球粒径的影响. 利用振动探针式磁强计(VSM)和原子吸收光谱(AAS)分别对磁性PMMA微珠的超顺磁性和Fe3O4含量进行了表征.

关键词: 聚甲基丙烯酸甲酯, 粒径, 影响参数, 超顺磁性

A series of magnetic poly(methyl methacrylate) (PMMA) particles were synthesized by a suspension polymerization technique. Poly(vinyl alcohol) (PVA 1788) and magnesium carbonate were used as stabilizer and acid stabilizer, respectively, while Fe3O4 magnetic fluid and ethylene glycol dimethacrylate were as magnetite and crosslinking reagents. All the particles have diameters ranging from 1 to 3 mm, while the particle size and its distribution could be adjusted by selecting a suitable polymerization medium. The effect of reaction parameters such as quantity of NaCl, magnesium carbonate and crosslinking reagent, water-to-monomer ratio and polymerization temperature on particle sizes was investigated in detail. The iron content of the composite particles was determined by using an atomic absorption spectrometer, and a vibrating sample magnetometer (VSM) clearly showed that the magnetic PMMA particles were superparamagnetic.

Key words: poly(methyl methacrylate), particle size, effect parameter, superparamagnetic