Incorporation of nonionic emulsifiers inside styrene–methacrylic acid copolymer particles during emulsion copolymerization☆
Incorporation of nonionic emulsifiers inside styrene–methacrylic acid copolymer particles during emulsion copolymerization☆
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DOI：
10.1016/j.polymer.2008.05.007
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发表时间：
2008-06
期刊：
影响因子：
4.6
通讯作者：
A. Chaiyasat;M. Yamada;Hiroshi Kobayashi;Toyoko Suzuki;M. Okubo
中科院分区：
文献类型：
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作者：
A. Chaiyasat;M. Yamada;Hiroshi Kobayashi;Toyoko Suzuki;M. Okubo
进行苯乙烯和甲基丙烯酸与具有各种亲水亲油平衡（HLB）值（13.7，Emulgen 911; 15.5，Emulgen 920; 17.2，Emulgen 931）的聚氧乙烯壬基苯基醚非离子乳化剂的乳液共聚。研究了多分散聚环氧乙烷（PEO）链长的非离子乳化剂在粒子内部的掺入行为。在聚合完成时，最低HLB值的乳化剂的掺入率为61%，远高于最高HLB值的乳化剂的掺入率（10%）。在两种聚合中，掺入的乳化剂的量随着转化率增加，并且PEO链更短（即，较低分子量）组分主要结合在较长PEO链组分上。
Emulsion copolymerizations of styrene and methacrylic acid with polyoxyethylene nonylphenyl ether nonionic emulsifiers having various hydrophilic–lipophilic balance (HLB) values (13.7, Emulgen 911; 15.5, Emulgen 920; 17.2, Emulgen 931) were performed. The incorporation behavior of the nonionic emulsifiers, comprising polydisperse poly(ethylene oxide) (PEO) chain lengths, inside the particles was investigated. At the completion of the polymerization, the incorporated percentage of the lowest HLB emulsifier was 61%, much higher than that of the highest HLB one (10%). In both polymerizations, the amounts of the incorporated emulsifiers increased with conversion, and shorter PEO chain (i.e., lower molecular weight) components were predominantly incorporated over longer PEO chain components.