Improving the Structural Control of Graft Copolymers by Combining ATRP with the Macromonomer Method

The reactivity ratios of methyl methacrylate (MMA) and methacryloyl-terminated poly(dimethylsiloxane) macromonomer (PDMS-MA) were determined in four different systems, using either conventional radical copolymerization or atom transfer radical copolymerization (ATRP) and using low molecular weight i...

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Published in:Macromolecules 2001-05, Vol.34 (10), p.3186-3194
Main Authors: Shinoda, Hosei, Miller, Peter J, Matyjaszewski, Krzysztof
Format: Article
Language:English
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Applied sciences
Copolymerization
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
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cited_by cdi_FETCH-LOGICAL-a323t-fc8812ab85cd3c229b7bf1071f1a51dd15b44f57a8fa7e20307b551ca70ffff3
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description The reactivity ratios of methyl methacrylate (MMA) and methacryloyl-terminated poly(dimethylsiloxane) macromonomer (PDMS-MA) were determined in four different systems, using either conventional radical copolymerization or atom transfer radical copolymerization (ATRP) and using low molecular weight initiators or poly(dimethylsiloxane) macroinitiators. While the relative reactivity of PDMS-MA (1/r MMA) decreased to 0.3−0.4 in the conventional radical polymerization, the reactivity ratio was higher in ATRP systems (ca. 0.8). The use of macroinitiator in the ATRP system increased 1/r MMA at high concentration and helped regularly incorporate PDMS-MA into the copolymer. However, in the conventional radical polymerization or redox systems, macro(azo)initiator did not as significantly improve the reactivity ratio of PDMS-MA. Graft copolymers obtained by ATRP (in both solution and semibulk) have much lower polydispersities than obtained in conventional radical systems.
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While the relative reactivity of PDMS-MA (1/r MMA) decreased to 0.3−0.4 in the conventional radical polymerization, the reactivity ratio was higher in ATRP systems (ca. 0.8). The use of macroinitiator in the ATRP system increased 1/r MMA at high concentration and helped regularly incorporate PDMS-MA into the copolymer. However, in the conventional radical polymerization or redox systems, macro(azo)initiator did not as significantly improve the reactivity ratio of PDMS-MA. 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subjects Applied sciences
Copolymerization
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
title Improving the Structural Control of Graft Copolymers by Combining ATRP with the Macromonomer Method
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