Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2014-06-05

Journal: JOURNAL OF APPLIED POLYMER SCIENCE

Included Journals: Scopus、EI、SCIE

Volume: 131

Issue: 11

ISSN: 0021-8995

Key Words: functionalization of polymers; glass transition; structure-property relations; grafting; copolymers

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 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.