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Anionic synthesis of polystyrene and polybutadiene heteroarm star polymers
Author(s) -
Quirk Roderic P.,
Lee Bumjae
Publication year - 1992
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.19920530119
Subject(s) - polybutadiene , polystyrene , styrene , polymer chemistry , polymer , materials science , monomer , lithium (medication) , crossover , copolymer , composite material , medicine , artificial intelligence , computer science , endocrinology
The use of living linking reactions of poly(styryl)lithium with 1,3‐bis(1‐phenylvinyl)benzene followed by crossover reactions with styrene or butadiene monomers has been used to prepare four‐armed heteroarm, star‐branched polymers. Bimodal molecular weight distributions have been observed for crossover reactions with both styrene and butadiene. Addition of THF ([THF]/[Li]=14–32) for crossover to styrene and lithium sec‐butoxide for crossover to butadiene produces monomodal molecular weight distributions. Symmetrical, four‐armed star polystyrenes have been synthesized; properties have been compared with a corresponding polymer prepared via a silicon tetrachloride linking reaction. Heteroarm, star‐branched polymers with two polystyrene arms and two polybutadiene arms with high 1,4‐microstructure have been prepared.