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Synthesis and characterization of star‐branched polyisobutylene with SIpS triblock copolymer core
Author(s) -
Wu Yibo,
Guo Wenli,
Li Shuxin,
Gong Huiqing
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29665
Subject(s) - copolymer , cationic polymerization , isobutylene , polymer chemistry , polystyrene , living anionic polymerization , materials science , polymerization , living cationic polymerization , anionic addition polymerization , multiangle light scattering , radical polymerization , light scattering , polymer , scattering , composite material , physics , optics
Well‐defined polystyrene‐ b ‐polyisoprene‐ b ‐polystyrene (SIpS) triblock copolymers with different microstructures were synthesized by living anionic polymerization. The synthesis of star‐branched polyisobutylene (PIB) was accomplished by the cationic polymerization in 2‐chloro‐2,4,4‐trimethylpentane/titanium tetrachloride/SIpS triblock copolymer/2,6‐di‐ tert ‐butylpyridine initiating system. The double bonds in SIpS triblock copolymer were activated as starting points for isobutylene polymerization. The formation of star‐branched architecture was demonstrated by size‐exclusion chromatography with quadruple detection: refractive index, multiangle laser light scattering, viscometric, and ultraviolet detectors. SIpS triblock copolymer with high 3,4‐PIp content is more reactive than that with high 1,4‐PIp content in cationic initiating stage. The yields of star‐branched PIB were remarkably dependent on the reaction time of TMP + with SIpS. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009