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Synthesis of well‐defined macrocyclic block copolymers using living coupling agent method
Author(s) -
Ma Jingjing
Publication year - 1995
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/masy.19950910105
Subject(s) - copolymer , polybutadiene , polymer chemistry , styrene , polystyrene , anionic addition polymerization , materials science , living anionic polymerization , dilithium , living polymerization , polymerization , chemistry , polymer , organic chemistry , radical polymerization , composite material , ion , deprotonation
Macrocyclic poly(styrene‐ b ‐butadiene) (SB) block copolymers were prepared by coupling a living poly(styrene‐ b ‐butadiene‐ b ‐styrene) (SBS) block copolymer using a living coupling agent, 1,3‐bis(1‐phenylethylenyl)benzene (DDPE), or a difunctional electrophile, dimethyldichlorosilane. The living poly(styrene‐ b ‐butadiene‐ b ‐styrene) block copolymer was generated from an addition product of sec‐butyllithium and DDPE. A living heteroarmed star block copolymer has been prepared by coupling two moles of monolithium polystyrene with one mole of DDPE followed by reinitiation and polymerization of the butadiene monomer. The dilithium 4‐armed star block copolymer was then coupled using dimethyldichlorosilane to form a cyclic polybutadiene with two attached polystyrene branches.