摘要
RAFT分散聚合是在分散体系中实施RAFT聚合的一种非均相聚合方法。RAFT分散聚合的最大特点是它可以直接制备聚合物分子量可控、分子量分布窄的聚合物粒子。本文简要介绍了在小分子RAFT试剂和大分子RAFT试剂(Macro-RAFT)存在下,RAFT分散聚合的聚合动力学、聚合物的成核和粒子的增长。小分子RAFT试剂存在下的RAFT分散聚合是一个与普通的分散聚合类似,可以看作为非均相条件下的RAFT聚合,它可以制备微米尺度的聚合物粒子。Macro-RAFT存在下的RAFT分散聚合,是制备高浓度、纳米尺度的嵌段共聚物胶体的重要方法,它包含嵌段共聚物胶束化之前的均相聚合和嵌段共聚物胶束化后的非均相聚合两个阶段。
The reversible addition-fragmentation-transfer （RAFT） dispersion polymerization is a typical controlled/ling radical polymerization under heterogeneous condition, which has the advantage to prepare micro-sized or nano-sized polymer particles with well-defined polymer molecular weight and low molecular weight distribution. In this manuscript, the dispersion polymerizations mediated with a small RAFT agent and a macromolecular RAFT （Macro-RAFT） agent are reviewed, and the polymerization kinetics, the polymer particle nucleation, and the polymer particle growth during the RAFT dispersion polymerizations are introduced. The difference between the dispersion polymerizations mediated with a small RAFT agent and a Macro-RAFT agent is revealed. The small RAFT agent mediated dispersion polymerization is generally performed under the heterogeneous condition similarly with the general radical dispersion polymerization, and micro-sized polymer particles are prepared at most cases. Whereas, an initial slow homogeneous polymerization before the block copolyrner micellization and a subsequent fast heterogeneous one after the block copolymer micellization are involved in the Macro-RAFT agent mediated dispersion polymerization, and nano-sized block copolymer colloids are usually prepared.
出处
《高分子通报》
CAS
CSCD
北大核心
2013年第1期174-180,共7页
Polymer Bulletin
基金
国家自然科学基金(No:20974051&21074059)
关键词
RAFT聚合
分散聚合
嵌段共聚物
Reversible addition-fragmentation-transfer （RAFT） polymerization
Dispersion polymerization
Blockcopolymers.
