Abstract
Polystyrene-graft-poly(methyl methacrylate) (PSt-graft-PMMA) was prepared by the nitroxide-mediated photo-living radical polymerization using poly(4-vinylbenzyl-4-oxy-2,2,6,6-tetramethylpiperidine-1-oxyl-ran-styrene) (P(VTEMPO-r-St)) as the macromediator. The bulk polymerization of methyl methacrylate was performed at room temperature by irradiation using a high-pressure mercury lamp with P(VTEMPO-r-St) as the mediator having the molar ratio of VTEMPO/St unit = 0.40/0.60 and the molecular weight of Mn = 21,700 and the (2RS,2′RS)-azobis(4-methoxy-2,4-dimethylvaleronitrile) as the initiator in the presence of the (4-tert-butylphenyl)diphenylsulfonium triflate as the photo-acid generator. The polymerization proceeded via a controlled polymerization mechanism because both the first-order time-conversion plots and the conversion-molecular weight plots showed linear increases. It was found that all the VTEMPO units supported the controlled PMMA chains by 1H NMR analysis because the molar ratio of the VTEMPO at the terminal chain end to the 1-cyano-3-methoxy-1,3-dimethylbutyl group at the initiation chain end of the PMMA was unity.
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The author thanks the JSPS Grant-in-Aid for Science Research (C) for the financial support of this study.
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Yoshida, E. Graft copolymerization of methyl methacrylate on polystyrene backbone through nitroxide-mediated photo-living radical polymerization. Colloid Polym Sci 289, 837–841 (2011). https://doi.org/10.1007/s00396-011-2385-0
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DOI: https://doi.org/10.1007/s00396-011-2385-0