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Polar polystyrene‐isoprene‐styrene copolymers with long polybutadiene branches
Author(s) -
Zhao Zhongfu,
Wang Zhanyue,
Zhang Chunqing,
Wang Yongzhao,
Li Zhansheng,
Hu Yanming,
Xiao Xuesong
Publication year - 2014
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.40303
Subject(s) - isoprene , polybutadiene , copolymer , polystyrene , polymer chemistry , styrene , degree of polymerization , materials science , glass transition , epoxide , polymerization , chemistry , polymer , organic chemistry , catalysis , composite material
Polar polystyrene‐isoprene‐styrene (SIS) copolymers having epoxide groups and long polybutadiene (PB) branches were synthesized via the combination of in situ epoxidation, anionic polymerization and graft‐onto reaction. They were characterized with 1 H NMR, GPC, FT‐IR, DSC, and contact angle test. Their polarity was determined by the epoxidation degree and graft efficiency. The epoxidation degree linearly increased with the epoxidation time. The graft efficiency decreased with the branch length, but increased with the epoxidation degrees. Although their glass transition temperature ( T g ) of diene blocks and flexibility properties had been negatively affected by in situ epoxidation, they could be modulated by the epoxidation degree, branch length, and branch density. Their T g could be tailored by the branch length and branch density since they fitted the Fox equation very well, especially as the longer branches were grafted. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40303.