Highly efficient synthesis of low polydispersity core cross-linked star polymers by Ru-catalyzed living radical polymerization
Date
2011
Authors
Goh, T.K.
Yamashita, S.
Satoh, K.
Blencowe, A.
Kamigaito, M.
Qiao, G.G.
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Journal article
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Macromolecular Rapid Communications, 2011; 32(5):456-461
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Abstract
The efficient formation of low polydispersity core cross-linked star (CCS) polymers via controlled/living radical polymerization (LRP) and the arm-first approach was found to be dependent on the mediating catalyst system. The Ru catalyst, Ru(Ind)Cl(PPh₃)₂ Cat. 1, and tertiary amine co-catalyst were used to synthesize highly living poly(methyl methacrylate) (PMMA) macroinitiators, which were then linked together with ethylene glycol dimethacrylate (EGDMA) to form PMMA(arm)PEGDMA(core) CCS polymers. The quantitative and near-quantitative synthesis of CCS polymers were observed for low to moderate molecular weight macroinitiators (M(n) = 8 and 20 kDa), respectively. Lower conversions were observed for high-molecular weight macroinitiators (M(n) ≥ 60 kDa). Overall, an improvement of between 10 and 20% was observed when comparing the Cat. 1 system to a conventional Cu-catalyzed system. This significant improvement in macroinitiator-to-star conversion is explained in the context of catalyst system selection and CCS polymer formation.
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Data source: supporting information, http://onlinelibrary.wiley.com/doi/10.1002/marc.201000641/abstract
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Copyright 2011 WILEY-VCH Verlag