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Stereospecific living polymerization and copolymerization of methacrylate and their use for construction of stereoregular chain architecture
Author(s) -
Hatada Koichi,
Kitayama Tatsuki,
Ute Koichi
Publication year - 1993
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19930700109
Subject(s) - tacticity , copolymer , polymer chemistry , materials science , polymerization , methacrylate , stereospecificity , polymer , living polymerization , styrene , anionic addition polymerization , methyl methacrylate , alkyl , molar mass distribution , ethylene glycol , radical polymerization , organic chemistry , chemistry , catalysis , composite material
Highly isotactic and highly syndiotactic living polymerizations of alkyl methacrylates were carried out in toluene at low temperatures by t ‐C 4 H 9 MgBr and t ‐C 4 H 9 Li‐R 3 A1, respectively. These living polymerizations enabled us to prepare highly stereoregular block and random copolymers of methacrylates with narrow molecular weight distributions. Reaction of ethylene glycol dimethacrylate with isotactic PMMA anion gave a highly branched star polymer. Syndiotactic PMMA star polymer was prepared by similar method. Stereoregular PMMA macromonomers with styrene and methacryloyl functions were prepared by using the stereospecific living polymerizations and polymerized by radical and anionic mechanisms. It was found that isotactic PMMA formed stereocomplexes with various types of syndiotactic polymethacrylates when treated under certain conditions. The complexes showed melting points which differ in a wide range of temperature. Isotactic and syndiotactic MMA oligomers without molecular weight distribution were isolated by supercritical fluid chromatography up to 29‐mer and characterized.