Stability of growing polymer chain ends for nitroxide-mediated photo-living radical polymerization |
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Authors: | Eri Yoshida |
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Institution: | (1) Department of Environmental and Life Sciences, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi Aichi, 441-8580, Japan |
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Abstract: | The stability of the growing polymer chain ends for the nitroxide-mediated photo-living radical polymerization of methyl methacrylate
(MMA) was explored through block copolymerization with isopropyl methacrylate (
i
PMA). The block copolymerization of
i
PMA was performed with the PMMA prepolymer prepared by the photopolymerization of MMA using the racemic-(2RS,2′RS)-azobis(4-methoxy-2,4-dimethylvaleronitrile) (r-AMDV) as the initiator, 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl (MTEMPO) as the mediator, and (4-tert-butylphenyl)-diphenylsulfonium triflate (
t
BuS) as the photo-acid generator. When the polymerization of MMA was carried out for 6.5 h, the resulting block copolymer
showed a bimodal GPC due to the deactivation of part of the growing chain ends of the prepolymer. On the other hand, when
the MMA polymerization was shortened to 5 h, the unimodal block copolymer was obtained without deactivation of the prepolymer. |
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Keywords: | |
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