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The synthesis of diene – alkyl methacrylate diblock and heteroarm star copolymers
Author(s) -
Fernyhough Christine M.,
Young Ronald N.
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200010)161:1<103::aid-masy103>3.0.co;2-s
Subject(s) - polymer chemistry , polybutadiene , copolymer , monomer , polymerization , methyl methacrylate , anionic addition polymerization , methacrylate , living anionic polymerization , diene , reactivity (psychology) , alkyl , solvent , tacticity , living polymerization , materials science , chemistry , radical polymerization , polymer , organic chemistry , composite material , medicine , alternative medicine , pathology , natural rubber
The synthesis of A 2 B 2 heteroarm stars, where A is either polyisoprene (PI) or polybutadiene (PB) and B is either poly(methyl methacrylate) (PMMA) or poly(butyl methacrylate) (PBMA) has been achieved using living anionic polymerization. Following polymerization of the diene in hexane by sec ‐BuLi, the solvent was changed to THF and the living chains were linked in pairs – without loss of anionic reactivity – using 1,2‐bis[4‐(1‐phenylethenyl)]ethane (EPEB). Star synthesis was completed by the addition of MMA or BMA monomer at −78°C. The diblocks were prepared by sequential polymerization. The resulting stereochemistries were those of greatest interest from a practical standpoint, i.e., PI or PB with a high 1,4‐content (which is highly elastic) and syndiotactic PMMA (which has a high T g ).