Studies of reversible addition-fragmentation chain transfer polymerization behavior and synthesis and characterization of block copolymers

• Main Authors: Yi-Ting Wang, 王薏婷
• Other Authors: T.L. Wang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/16746416726969320509

碩士 === 國立高雄應用科技大學 === 化學工程系碩士班 === 92 === Reversible addition-fragmentation chain transfer (RAFT) polymerization has recently emerged as one of the living radical polymerization techniques to synthesize well-defined polymers. The purpose of this research aimed at the development of RAFT technique and preparation of block copolymers using this approach. First, three different kinds of chain transfer agents of dithiobenzoate were synthesized. These chain transfer agents were then used in the polymerization behavior studies of bulk, solution, emulsion and suspension polymerization. The synthesized chain transfer agents were characterized with FTIR and 1H-NMR to confirm their structures. The polymerization results of four reaction types indicated that C1AM polymerized by emulsion reaction was the most controllable reaction. Kinetic studies of RAFT showed that C3BS-5 by bulk polymerization had linear plots of vs. conversion and ln([M]o/[M]) vs. reaction time. These results confirmed that the RAFT polymerization of C3BS-5 was a living radical polymerization. In the synthesis of diblock copolymers using styrene and methyl methacrylate (MMA), it was found that styrene must be the first block. The structures of prepared diblock copolymers were confirmed by FTIR, 1H-NMR and GPC. TGA results indicated that the thermal stability of copolymers was lower than that of polystyrene due to the presence of the more degradable MMA segment.