화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.13, No.5, 391-396, October, 2005
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Cu Catalyst System with Phosphorous Containing Bidendate Ligand for Living Radical Polymerization of MMA
Sung Chul Hong, Ki Eun Shin1, Seok Kyun Noh1, †, and Won Seok Lyoo2
  • Department of Nano Science and Technology, Sejong University, Seoul 143-747, Korea
  • 1School of Chemical Engineering & Technology, Yeungnam University, Gyeongsan, Gyeongbuk 712-749, Korea
  • 2School of Textiles, Yeungnam University, Gyeongsan, Gyeongbuk 712-749, Korea
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The polymerization of methyl methacrylate (MMA) was carried out using CuBr/bidentate phosphorus ligand catalyst systems. MMA polymerization with CuBr/ phosphine-phosphinidene (PP) exhibited high conversion (~80%) in 5 h at 90 ℃ along with a linear increase of ln([M]0/[M]) versus time, indicating constant concentration of the propagating radicals during the polymerization. The molecular weight of the prepared PMMA tended to increase with conversion, suggesting the living polymerization characteristic of the system. On the other hand, a large difference between the measured and theoretical molecular weight and a broad molecular weight distribution were observed, implicating possible incomplete control over the polymerization. This may have been caused by the low deactivation rate constant (kdeact) of the system. The low kdeact would result in irreversible generation of radicals instead of reversible activation/deactivation process of ATRP. Polymerizations performed at different ligand to CuBr ratios and different monomer to initiator ratios did not afford better control over the polymerization, suggesting that the controllability of CuBr/phosphorus ligand system for ATRP is inherently limited.
Keywords:controlled radical polymerization;MMA polymerization;Cu/phosphorus ligand catalyst;bidendate phosphorus ligand for controlled polymerization.
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