Photo-living radical polymerization of methyl methacrylate using alkoxyamine as an initiator |
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Authors: | Eri Yoshida |
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Institution: | (1) Department of Materials Science, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan |
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Abstract: | The photoradical polymerization of vinyl acetate was performed using 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl (MTEMPO)
as the mediator in the presence of bis(alkylphenyl)iodonium hexafluorophosphate (BAI). The MTEMPO/BAI system using 2,2’-azobis(isobutyronitrile)
or 2,2’-azobis(4-methoxy-2,4-dimethylvaleronitrile) as the initiator did not succeed in controlling the molecular weight and
produced polymers that showed a bimodal gel permeation chromatography with the broad molecular weight distribution. On the
other hand, the polymerization using 1-(cyano-1-methylethoxy)-4-methoxy-2,2,6,6-tetramethylpiperidine and BAI proceeded by
the living mechanism based on linear increases in the first order time–conversion and conversion–molecular weight plots. The
molecular weight distribution also increased with the increasing conversion due to cloudiness of the solution as the polymerization
proceeded. It was found that the polymerization had a photolatency because the propagation stopped by interruption of the
irradiation and was restarted by further irradiation. |
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Keywords: | |
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