申请人:McCormick L. Charles
公开号:US20070123670A1
公开(公告)日:2007-05-31
Polymers and copolymers synthesized by means that yield a narrow range of molecular weights can have different properties than polymers synthesized by conventional means. In order to obtain such polymers, however, polymerization must be controlled. One type of controlled polymerization is the reversible addition-fragmentation chain transfer (RAFT) process, which has characteristics of a living polymerization. The present invention discloses a group of dithioesters and trithioesters suitable as chain transfer agents for RAFT polymerization. The present invention also discloses RAFT polymerizations conducted in aqueous media.
通过产生分子量窄范围的手段合成的聚合物和共聚物可能具有不同于传统手段合成的聚合物的性质。然而,为了获得这种聚合物,聚合必须受到控制。一种受控聚合的类型是可逆加成-断裂链转移(RAFT)过程,具有活性聚合的特征。本发明揭示了一组二硫代酯和三硫代酯,适用于RAFT聚合的链转移剂。本发明还揭示了在水介质中进行的RAFT聚合。