Polar polystyrene‐isoprene‐styrene copolymers with long polybutadiene branches |
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| Authors: | Zhongfu Zhao Zhanyue Wang Chunqing Zhang Yongzhao Wang Zhansheng Li Yanming Hu Xuesong Xiao |
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| Affiliation: | 1. Department of Polymer Science and Engineering, Dalian University of Technology, Dalian, China;2. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, China;3. Yifang Industry Factory, Liaoyang Petrochemical Company, PetroChina Company Limited, Liaoyang, Liaoning Province, China |
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| Abstract: | 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 1H 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 (Tg) 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 Tg 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. |
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| Keywords: | functionalization of polymers glass transition structure– property relations grafting copolymers |
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