Synthesis and functionalities of poly(N-vinylalkylamide). XIV. Polyvinylamine produced by hydrolysis of poly(N-vinylformamide) and its functionalization

Authors

  • Kazuya Yamamoto,

    1. Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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  • Yachiyo Imamura,

    1. Department of Home Economics, Faculty of Education, Kagoshima University, 1-20-6 Korimoto, Kagoshima 890-0065, Japan
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  • Emi Nagatomo,

    1. Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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  • Takeshi Serizawa,

    1. Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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  • Yoichiro Muraoka,

    1. Department of Home Economics, Faculty of Education, Kagoshima University, 1-20-6 Korimoto, Kagoshima 890-0065, Japan
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  • Mitsuru Akashi

    Corresponding author
    1. Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
    • Department of Nanostructural and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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Abstract

The molecular weights of poly(N-vinylformamide) [poly(NVF)] obtained by free-radical polymerization were expanded from being in the range of thousands to hundreds of thousands. Primary amino groups were introduced by the hydrolysis of poly(NVF) under both acidic and basic conditions. After 2 h polyvinylamine [poly(VAm)] was given at 60°C under a 2N NaOH solution. The apparent activation energy of poly(NVF) hydrolysis was 61.8 kJ/mol. Furthermore, alkyl side chains were partly introduced by a polymer modification reaction in poly(VAm) with carboxylic acid, using WSC (water-soluble carbodiimide) as the activating agent to produce the stimuli-responsive poly(VAm) derivative. The effects of external stimuli such as temperature and pH on the phase-transition behavior of the copolymers were then studied. The lower critical solution temperature at pH 12 decreased depending on the alkyl group content. The phase-transition behavior of the resulting polymers was also found to vary depending on the side-chain length of the alkyl groups. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1277–1283, 2003

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