Novel poly(Methyl Methacrylate)-block-poryurethane-block-pory(Methyl Methacrylate) tri-block copolymers through atom transfer radical polymerization

被引：0
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作者：
Tharanikkarasu, Kannan [1 ]
Verma, Hemant [1 ]
Jang, Wonbong [2 ]
Lee, Seok Kyu [2 ]
Seo, Jongchul [2 ]
Baek, Sanghyun [3 ]
Han, Haksoo [2 ]
机构：
[1] Department of Chemistry, University of Delhi, Delhi 110 907, India
[2] Department of Chemical Engineering, Yonsei University, Seodaemun-gu, Seoul 120-749, Korea, Republic of
[3] Department of Chemical Engineering, KyungHee University, Gyeonggi-do 446-701, Korea, Republic of
来源：
Journal of Applied Polymer Science | 2008年 / 108卷 / 03期
关键词：
Poly(methyl methacrylate)-block-polyurethane-block-poly(methyl methacrylate) tri-block copoly-mers have been synthesized successfully through atom transfer radical polymerization of methyl methacrylate using telechelic bromo-terminated polyurethane/CuBr/ N,N,N,N″,N″- pentamethyldiethylenetriamine initiating system. As the time increases, the number-average molecular weight increases linearly from 6400 to 37,000. This shows that the poly methyl methacrylate blocks were attached to polyurethane block. As the polymerization time increases, both conversion and molecular weight increased and the molecular weight increases linearly with increasingconversion. These results indicate that the formation of the triblock copolymers was through atom transfer radical polymerization mechanism. Proton nuclear magnetic resonance spectral results of the triblock copolymers show that the molar ratio between polyurethane and poly (methyl methacrylate) blocks is in the range of 1 : 16.3 to 1 : 449.4. Differential scanning calorimetry results show Tg of the soft segment at -35°C and Tg of the hard segment at 75°C. © 2008 Wiley Periodicals, Inc;
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页码：1538 / 1544
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