Raft in emulsion polymerization: What makes it different
Raft in emulsion polymerization: What makes it different
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DOI：
10.1071/ch02073
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发表时间：
2002-08
期刊：
影响因子：
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通讯作者：
R. Gilbert;Stuart W. Prescott;W. Smulders;M. Monteiro;M. Ballard;E. Rizzardo
中科院分区：
文献类型：
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作者：
R. Gilbert;Stuart W. Prescott;W. Smulders;M. Monteiro;M. Ballard;E. Rizzardo
可逆加成-断裂链转移(RAFT)聚合技术是最近大量工作的焦点，特别是在乳液聚合中的应用，这是实现大多数工业规模的自由基聚合的首选方法。RAFT/乳液聚合具有相当大的技术潜力：“量身定制”材料性能，消除表面涂层中添加的表面活性剂，等等。然而，在乳液聚合体系中使用RAFT遇到了相当大的困难。本文综述了RAFT技术在乳液聚合中的应用进展，总结了所遇到的困难和解释所观察到的行为的机理。在乳液聚合中实现RAFT的困难的可能原因包括液滴中的聚合、一些RAFT试剂的水敏性、高度疏水的RAFT试剂在水相中的缓慢传输以及一些RAFT试剂的表面活性。
Reversible addition-fragmentation chain transfer (RAFT) polymerization techniques have been the focus of a great deal of recent work, particularly in their application to emulsion polymerization, which is the method of choice for implementing most free-radical polymerizations on an industrial scale. RAFT/emulsion polymerizations have considerable technical potential: to 'tailor-make' material properties, to eliminate added surfactant from surface coatings, and so on. However, considerable difficulties have been experienced in using RAFT in emulsion polymerization systems. Here, progress in the application of RAFT techniques to emulsion polymerization is reviewed, summarizing the difficulties that have been experienced and mechanisms that have been postulated to explain the observed behaviour. Possible origins of the difficulties in implementing RAFT in emulsion polymerizations include polymerization in droplets, water sensitivity of some RAFT agents, slow transport of highly hydrophobic RAFT agents across the water phase, and surface activity of some RAFT agents.