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论文类型：期刊论文

发表时间：2014-06-05

发表刊物：JOURNAL OF APPLIED POLYMER SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：131

期号：11

ISSN号：0021-8995

关键字：functionalization of polymers; glass transition; structure-property relations; grafting; copolymers

摘要：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 H-1 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. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40303.