Nitroxide-Mediated Photo-Controlled/Living Radical Polymerization of Methacrylic Acid

Eri Yoshida

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DOI: 10.4236/ojpchem.2013.31004                

Abstract

The photo-controlled/living radical polymerization of methacrylic acid (MAA) was performed at room temperature by irradiation with a high-pressure mercury lamp using azo initiators and 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl as the mediator in the presence of (4-tert-butylphenyl)diphenylsulfonium triflate (^tBuS) as the accelerator. Whereas the bulk polymerization yielded polymers with a bimodal molecular weight distribution in both the absence and presence of ^tBuS, the solution polymerization in methanol produced unimodal polymers with the molecular weight distribution of 2.0 - 2.3 in the presence of ^tBuS. The molecular weight distribution of the resulting poly (MAA) decreased with an in- crease in ^tBuS. The dilution of the monomer concentration also reduced the molecular weight distribution. The use of the initiator with a low 10-h half-life temperature also effectively controlled the molecular weight. The livingness of the polymerization was confirmed by obtaining linear increases in the first-order conversion versus time, the molecular weight versus the conversion, and the molecular weight versus the reciprocal of the initiator concentration.

Keywords

Photo-Controlled/Living Radical Polymerization; Nitroxide-Mediated Polymerization; Methacrylic Acid; 4-Methoxy-2, 2, 6, 6-Tetramethylpiperidine-1-Oxyl; (4-Tert-butylphenyl)diphenylsulfonium Triflate; Molecular Weight Control

Conflicts of Interest

The authors declare no conflicts of interest.

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