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Synthesis and properties of polystyrene‐ b ‐poly(ethylene oxide)‐ b ‐polystyrene triblock copolymers
Author(s) -
Xu DongMei,
Zhang KeDa,
Wu JianFeng
Publication year - 2006
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.23971
Subject(s) - copolymer , polymer chemistry , polystyrene , materials science , ethylene oxide , crystallinity , glass transition , polymerization , polymer , composite material
Abstract A series of well‐defined and property‐controlled polystyrene (PS)‐ b ‐poly(ethylene oxide) (PEO)‐ b ‐polystyrene (PS) triblock copolymers were synthesized by atom‐transfer radical polymerization, using 2‐bromo‐propionate‐end‐group PEO 2000 as macroinitiatators. The structure of triblock copolymers was confirmed by 1 H‐NMR and GPC. The relationship between some properties and molecular weight of copolymers was studied. It was found that glass‐transition temperature ( T g ) of copolymers gradually rose and crystallinity of copolymers regularly dropped when molecular weight of copolymers increased. The copolymers showed to be amphiphilic. Stable emulsions could form in water layer of copolymer–toluene–water system and the emulsifying abilities of copolymers slightly decreased when molecular weight of copolymers increased. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 727–730, 2006