Model filled polymers. IX. Synthesis of uniformly crosslinked polystyrene microbeads
Model filled polymers. IX. Synthesis of uniformly crosslinked polystyrene microbeads
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DOI：
10.1002/polb.1992.090301102
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发表时间：
1991-06
期刊：
影响因子：
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通讯作者：
Z. Ding;Shuaifei Ma;D. Kriz;J. J. Aklonis-J.;R. Salovey
中科院分区：
文献类型：
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作者：
Z. Ding;Shuaifei Ma;D. Kriz;J. J. Aklonis-J.;R. Salovey
苯乙烯（S）与二乙烯基苯（DVB）在无乳化剂的间歇乳液共聚合中反应制备的单分散尺寸的交联聚苯乙烯（PS）珠粒不能均匀交联，因为DVB比S的反应活性高。对于1至10摩尔% DVB和S的共聚，在每个交联的PS微珠内，交联密度变化超过2倍，并且随着转化率的增加而降低。一个连续的共聚，涉及增量添加DVB，产生均匀交联的PS珠。对于这两种共聚技术，Tg与交联密度和PS珠是球形和单分散的大小相关。John Wiley & Sons，Inc.
Monodisperse sized crosslinked polystyrene (PS) beads prepared by reaction of styrene (S) and divinylbenzene (DVB), in batch emulsion copolymerization in the absence of emulsifiers, are not uniformly crosslinked, because DVB is more reactive than S. For copolymerization of 1 to 10 mol % DVB and S, within each crosslinked PS microbead, the crosslink density varies by a factor exceeding two and decreases with increased conversion. A semicontinuous copolymerization, involving incremental additions of DVB, produces uniformly crosslinked PS beads. For both copolymerization techniques, Tg correlates well with crosslink density and PS beads are spherical and monodisperse in size. © 1992 John Wiley & Sons, Inc.