期刊
COLLOID AND POLYMER SCIENCE
卷 288, 期 2, 页码 181-188出版社
SPRINGER
DOI: 10.1007/s00396-009-2149-2
关键词
Amphiphilic; Atom transfer radical; polymerization; Macroinitiator; Polyurethane; Tri-block copolymers
资金
- Council of Scientific and Industrial Research (CSIR), New Delhi, India [01(2262)/08/EMR-II]
Atom transfer radical polymerization of 2-(dimethylamino) ethylmethacrylate and styrene was carried out using tertiary bromine-terminated telechelic polyurethane as a macroinitiator. The resulting ABA-type amphiphilic, poly (2-(dimethylamino) ethylmethacrylate)-b-polyurethane-b-poly (2-(dimethylamino) ethylmethacrylate) and hydrophobic, polystyrene-b-polyurethane-b-polystyrene tri-block copolymers were characterized by spectral, thermal, and chromatographic techniques. As the conversion increases, (M) over bar (n) also increases linearly. Theoretical M-n values of the triblock copolymers were comparable with the experimental (M) over bar (n) values. These results show that the polymerization of styrene and 2-(dimethylamino) ethylmethacrylate occurred through controlled radical polymerization mechanism. Mole percentage of polystyrene and poly (2-(dimethylamino) ethylmethacrylate) blocks in the tri-block copolymers was calculated using proton nuclear magnetic resonance spectroscopy, and the results were comparable with the gel permeation chromatography results. The glass transition temperatures of polystyrene and poly (2-(dimethylamino) ethylmethacrylate) blocks in the tri-block copolymers appeared at 72 degrees C and 110 degrees C, respectively. These results confirm the presence of two phases in the tri-block copolymers.
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