二乙烯基苯
分散性
沉淀聚合
聚合
粒径
高分子化学
化学工程
乙腈
单体
降水
材料科学
粒度分布
聚合物
化学
自由基聚合
色谱法
有机化学
共聚物
物理化学
苯乙烯
气象学
工程类
物理
作者
Feng Bai,Xinlin Yang,Wenqiang Huang
出处
期刊:Macromolecules
[American Chemical Society]
日期:2004-11-25
卷期号:37 (26): 9746-9752
被引量:259
摘要
Highly cross-linked narrow or monodisperse poly(divinylbenzene) (PDVB) microspheres were prepared by distillation−precipitation polymerization as a novel polymerization technique in acetonitrile with 2,2‘-azobis(2-methylpropionitrile) (AIBN) as initiator. The polymeric microspheres were formed simultaneously through a precipitation polymerization manner during the distillation of acetonitrile off the reaction system. Narrow or monodisperse particles with spherical shape and smooth surface were prepared with diameters between 1.10 and 3.41 μm without any stabilizers. The particle size and size distribution depended on the reaction conditions. The maximum particle size of 2.14 μm with size distribution index of 1.058 was attained at cross-linking degree of 64%, and the size distribution became narrower with increasing cross-linking degree. The particle sizes increased with increasing monomer and initiator concentration. A series of polymer particles with diameter between 1.99 and 3.41 μm were obtained by multi-semibatch mode with successive introduction of a mixture of the designed amount of AIBN and divinylbenzene containing 80% divinylbenzene (DVB80) in acetonitrile into the distillation−precipitation polymerization, and the size distribution index was kept around 1.02. Furthermore, the conversion increased from 31% for the first aliquot to 76% for the sixth aliquot. All of the resulting microspheres were characterized with SEM.
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