FORMATION OF LARGE MONODISPERSE COPOLYMER PARTICLES BY DISPERSION POLYMERIZATION
FORMATION OF LARGE MONODISPERSE COPOLYMER PARTICLES BY DISPERSION POLYMERIZATION
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DOI：
10.1021/ma00168a007
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发表时间：
1987-02-01
期刊：
影响因子：
5.5
通讯作者：
LOK, KP
中科院分区：
文献类型：
--
作者：
OBER, CK;LOK, KP
由苯乙烯和甲基丙烯酸正丁酯组成的单分散共聚物颗粒已在1 -10-µ尺寸范围内制备。这些颗粒是通过分散聚合在乙醇-水介质中使用单一的空间稳定剂，以防止聚结。研究了几种共聚单体的比例，观察到在进料组成中基本上完全掺入单体的所有情况下，都可以获得窄的粒径分布。起始溶剂组合物的极性差异可以用溶解度参数来估计，并且发现对最终粒度具有显著影响。观察到反应介质的极性随着单体向聚合物的转化而变化以加宽粒径分布。
Monodisperse copolymer particles consisting of styrene and n-butyl methacrylate have been prepared in the l-10-µ size range. These particles were prepared by dispersion polymerization in ethanol-water media using a single steric stabilizer to prevent coalescence. Several comonomer ratios were investigated, and it was observed that narrow size distributions could be achievedin all cases with essentiallycomplete incorporation of monomer at the feed composition. Differences in the polarity of the starting solvent composition could be estimated with the solubility parameter and were found to have a significant effect on final particle size. Changes in the polarity of the reaction medium with conversion of monomer to polymer was observed to broaden the particle size distribution.