Graft copolymerization induced by thermal reactions of the binary alkali salts of poly(carboxylic acid)-brominated carboxylic acid in bulk

Yoshio Kasashima, Koichi Shinoda, Hiroshi Matsushima, Satoko Shitagaki, Mari Inoki, Fumihiko Akutsu, Tadashi Shimura, Masaomi Tsuchiya

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Thermal reactions of the binary alkali salts of poly(carboxylic acid)-brominated carboxylic acid such as sodium or potassium poly(4-vinylbenzoate)-2-bromopropanoate [Na or K (PVBA-2-BPA)] in bulk were investigated. A methanol solution of binary acids was prepared by fixing the molar ratio of the repeating unit of polymeric acid to the fraction of brominated carboxylic acid. The binary salts were prepared by the neutralization of the binary acid solution. The product of the thermal reaction followed by esterification was identified as a graft copolymer containing PVBA in the main chain and polylactic acid in the side chain. The reaction of 1/15 K (PVBA-2-BPA) at 120°C for 2 h yielded the highest percentage of grafting (300%). The grafting proceeded gradually for the initial 2 h and then somewhat. Reactivity of the K salt was higher than that of the corresponding Na salt. The thermal reaction of 1/10 K [polymethacrylate-2-BPA (PMA-2-BPA)] at 120 °C for 2 h also yielded a graft copolymer, and the percentage of grafting was 300%. However, reaction temperatures higher than 120°C caused homopolycondensation of K 2-BPA prior to grafting, and homopolycondensation occurred prior to grafting in the reaction with Na (PMA-2-BPA).

Original languageEnglish
Pages (from-to)1877-1885
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Issue number11
Publication statusPublished - 2001 Jun 1



  • Graft copolymerization
  • Polycondensation
  • Polylactic acid
  • Thermal polymerization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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