Spin-labelled gels of poly(methyl acrylate)

Antal Rockenbauer, Mikael Lindgren, Masayoshi Tabata, Wu Yang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Spin-labelled poly(methylacrylate) (PMA) was investigated by ESR both in the swollen and in the dried gel state. The polymerization was induced by γ-irradiation; the spin-labelling was carried out by thermal treatment in the presence of 2,4,6-trichloronitrosobenzene. The labelling takes place both on the methine and the methylene carbons of the PMA chain resulting in a triplet and a six-line ESR spectrum respectively. For both radicals, the correlation time is of the order of 10-9 sec in the swollen gel and 10-8 sec in the dried gel. The temperature dependence of the ESR signal associated with the three-line radical and six-line radical could be analysed in terms of a diffusion model. The activation energies were determined as 23 and 19 kJ/mol, respectively. The radical structures and reactions are discussed.

Original languageEnglish
Pages (from-to)945-950
Number of pages6
JournalEuropean Polymer Journal
Volume29
Issue number7
DOIs
Publication statusPublished - Jul 1993

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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