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Polymers 2012, 4(3), 1580-1589; doi:10.3390/polym4031580
Communication

Selective Controlled/Living Photoradical Polymerization of Glycidyl Methacrylate, Using a Nitroxide Mediator in the Presence of a Photosensitive Triarylsulfonium Salt

Department of Environmental and Life Sciences, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
Received: 23 July 2012 / Revised: 10 August 2012 / Accepted: 30 August 2012 / Published: 10 September 2012
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Abstract

The controlled/living photoradical polymerization of glycidyl methacrylate (GMA) was attained using 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl (MTEMPO) as the mediator and (2RS,2'RS)-azobis(4-methoxy-2,4-dimethylvaleronitrile) as the initiator in the presence of (4-tert-butylphenyl)diphenylsulfonium triflate (tBuS). Whereas the polymerization in the absence of MTEMPO yielded a gel-containing polymer, the MTEMPO-mediated polymerization produced poly(GMA) bonded at the vinyl site, and retained the oxirane ring structure. No occurrence of the cationic ring-opening photopolymerization of the oxirane ring even in the presence of the photosensitive onium salt indicated that tBuS served as the photoelectron transfer agent between MTEMPO in their excited states at the propagating chain end. The resulting polymers had comparatively narrow molecular weight distributions of Mw/Mn = 1.46–1.48. The living nature of the MTEMPO-mediated polymerization was confirmed on the basis of a linear increase in the conversion-molecular weight plots and gel permeation chromatography (GPC) analysis.
Keywords: photopolymerization; controlled/living radical polymerization; vinyl group; glycidyl methacrylate; oxirane ring; 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl; cationic ring-opening photopolymerization; (4-tert-butylphenyl)diphenylsulfonium triflate; (2RS,2'RS)-azobis(4-methoxy-2,4-dimethylvaleronitrile) photopolymerization; controlled/living radical polymerization; vinyl group; glycidyl methacrylate; oxirane ring; 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl; cationic ring-opening photopolymerization; (4-tert-butylphenyl)diphenylsulfonium triflate; (2RS,2'RS)-azobis(4-methoxy-2,4-dimethylvaleronitrile)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yoshida, E. Selective Controlled/Living Photoradical Polymerization of Glycidyl Methacrylate, Using a Nitroxide Mediator in the Presence of a Photosensitive Triarylsulfonium Salt. Polymers 2012, 4, 1580-1589.

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