高分子材料性能追本朔源主要由分子链微结构决定。以RAFT聚合为代表的"活性"/可控自由基聚合结合了传统自由基聚合和活性阴离子聚合各自的优点，提供了一种有效调控聚合物分子链微结构的聚合方法。RAFT乳液聚合作为"活性"/可控自由基聚合中具有工业应用前景的聚合方法，在过去二十年受到了学术界的广泛关注。本文总结了RAFT乳液聚合乳液失稳机理、聚合动力学、链结构的可控性等方面的进展。在此基础上，介绍了通过RAFT乳液聚合这一可控制备聚合物新材料的平台制备得到的新型嵌段共聚物、梯度共聚物，并展望了RAFT乳液聚合在高分子合成材料领域的应用前景。
The properties of polymer materials are based on chain microstructures. Combining with the merits of both conventional radical polymerization and living anionic polymerization, controlled/"living" radical polymerizations(CLRPs) represented by RAFT polymerization have been shown to be a powerful tool to finely tune chain microstructures. RAFT emulsion polymerization, as a CLRP process very promisingly used in industry, has received extensive attentions for the past two decades. The current review summarizes the up-to-date status of RAFT emulsion polymerization in terms of colloidal instability, polymerization kinetics, and the controllability over chain microstructures, including molecular weight, PDI and livingness. Some new materials of block and gradient copolymers from the RAFT emulsion polymerization are summarized. In addition, the prospects of RAFT emulsion polymerization in polymeric material synthesis are also highlighted.
Contents
1 Introduction
2 Colloidal instability of RAFT emulsion polymerization
3 Controllability of RAFT emulsion polymerization
3.1 Polymerization kinetics
3.2 Molecular weight and PDI
3.3 Livingness and high molecular weight polymer
4 New materials synthesized via RAFT emulsion polymerization
4.1 Block copolymer
4.2 Gradient copolymer
5 Conclusion
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