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Synthesis and characterization of “umbrella” shaped polymers
Author(s) -
Wang Fei,
Roovers Jacques,
Toporowski Paul M.
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.19950950122
Subject(s) - hydrosilylation , polymer , polybutadiene , polystyrene , polymer chemistry , materials science , silane , polymerization , chemical engineering , chemistry , copolymer , organic chemistry , composite material , catalysis , engineering
A new strategy has been developed to prepare umbrella polymer, i.e. star polymers with one heteroarm. The synthesis uses living anionic polymerization to prepare a short segment of 1,2‐polybutadiene at the end of a linear polystyrene. The vinyl groups of 1,2‐polybutadiene are hydrosilylated with dichloro(methyl)silane. The umbrella polymer is then formed by nucleophilic displacement of the silicon‐chlorine with 1,4‐polybutadienyllithium. An umbrella polymer with poly(2‐vinylpyridine) arms is prepared in the same way after hydrosilylation with chlorodimethylsilane. The umbrella polymers are characterized by light scattering, size‐exclusion chromatography (SEC), ultraviolet/visible spectroscopy (UV/vis), nuclear magnetic resonance (NMR) and intrinsic viscosity.