Synthesis and characterization of star‐branched polyisobutylene with SIpS triblock copolymer core |
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| Authors: | Yibo Wu Wenli Guo Shuxin Li Huiqing Gong |
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| Affiliation: | 1. Department of Material Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;2. College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | 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 |
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| Keywords: | cationic polymerization polystyrene‐b‐polyisoprene‐b‐polystyrene star‐branched polymer polyisobutylene |
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