Synthesis and characterization of linear ABC triblock copolymer of ethylene oxide, methyl methacrylate, and styrene

✍ Scribed by Xiaoyu Huang; Sheng Chen; Junlian Huang

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 214 KB
• Volume: 37
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19990315)37:6<825::aid-pola18>3.0.co;2-1

✦ Synopsis

A well-defined linear ABC triblock copolymer of ethylene oxide (EO), methyl methacrylate (MMA), and styrene (St) was prepared by sequential living anionic and photo-induced charge transfer polymerization (CTP) using p-aminophenol as parent compound. In the first step, the diblock copolymer of PEO-b-PMMA with a protected aniline end group at PEO end was prepared by initiating of phenoxo-anion the polymerization of EO and MMA successively, then the diblock copolymer of PEOb-PMMA via deprotection of aniline at PEO end constituted a binary initiation system with benzophenone (BP) by charge transfer complex mechanism to initiate the polymerization of St under UV-irradiation. The GPC and NMR measurements support that in copolymerization, either in the first or second step, neither homopolymer nor side reactions, such as chain transfer or chain termination, was found. The effect of the concentration of PEO a -b-PMMA and St, and the polarity of solvent on the polymerization rate (R p ) of CTP is discussed.