苯乙烯的RAFT乳液聚合

Living polystyrene chains with higher molecular weight were synthesized via emulsion polymerization process mediated by amphiphilic RAFT agent. As indicated by the kinetic curves, the whole reaction period was divided into three stages: nucleation, constant rate and deceleration, which were similar to those in conventional emulsion polymerization. During reaction, experimental molecular weights agreed well with the theoretical ones, demonstrating the living characters of the polymerization. Influenced by the nucleation process, the molecular weight distributions were high initially, but they decreased afterwards. The PDI was only 1.2 when the grew to 70000 g/mol finally. Meanwhile, the latex was of monodispersed particle size. These properties were all far superior to those of products from RAFT miniemulsion polymerization.