Influence of electron beam irradiation on properties of fluorine-containing poly(aryl ether ketone)s

Kunio Kimura, Yumi Tabuchi, Ai Nishichi, Yuhiko Yamashita, Yasunori Okumura, Kazushi Omote, Yosuke Morita, Hisaaki Kudo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The influence of electron beam irradiation on the properties of fluorine-containing poly(aryl ether ketone)s (F-PEK), derived from 2,3,4,5,6-pentafluorobenzoic acid, was examined. Irradiation was performed with an electron beam at a dose of 3.63 × 103 Gy s-1 for which the corresponding doses were 29.0, 51.0, and 94.5 MGy. Tensile strength at break increased up to a dose of 29.0 MGy and then decreased very slightly with irradiation. Elongation at break was more susceptible to irradiation and decreased drastically to one tenth at a dose of 29.0 MGy. Young's modulus was enhanced by the irradiation. F-PEKs were changed from elastic materials to strong and brittle materials by irradiation. Relaxation of the viscoelastic property shifted toward higher temperature by irradiation. These tensile and viscoelastic property changes were attributed to the formation of a bulkier and more rigid structure by crosslinking. The fluorine atoms attached to the 1,4-phenylene moiety in F-PEKs were surprisingly susceptible to the irradiation and were completely lost at a dose of 29.0 MGy. The π-electron conjugated aromatic structure was concurrently developed during irradiation. Further, polar functional groups such as carboxyl group and ester group were generated by chain scission and rearrangement. The F-PEKs retained their good transparency and the thermal stability was significantly improved after irradiation.

Original languageEnglish
Pages (from-to)157-166
Number of pages10
JournalJournal of Applied Polymer Science
Volume91
Issue number1
DOIs
Publication statusPublished - Jan 5 2004

Keywords

  • Crosslinking
  • Electron beam
  • Fluorine
  • Mechanical property
  • Poly(ether ketone)

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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