Chinese Journal of Magnetic Resonance

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RADICALS GENERATED FROM THERMALLY -TREATED POLY(ARYL-ETHER-KETONE) COPOLYMERS CONTAINING  1,5-NAPHTHALENE MOIETIES STUDIED BY ESR SPECTROSCOPY

DONG Feng-xia,  ZHENG Ying-guang* , NIU Ya-ming, WANG Gui-bin, JIANG Zhen-hua*   

  1. Analysis and Measurement Center Jilin University, Changchun 130023,China; Department of Chemistry Jilin University, Changchun 130023,China
  • Received:2003-04-28 Revised:2003-06-20 Published:2003-12-05 Online:2003-12-05
  • About author:*Correspondence author: Zheng Ying-guang,E-mail: YGZheng@mail.jlu.edu.cn,Tel:(0431)8498943

Abstract:

Poly(aryl-ether-ether-ketone)copolymers containing 1,5-Naphthalene moieties have been heated at 340 ℃ in air for different time, and it has been sho
wn that crosslinks are formed under oxidative condition, causing a reduction in the crystallizability of the material. Using ESR spectroscopy, we investigated t
he radicals generated from P(EEK-co-20 mol% ENEK) random copolymers heated at 340 ℃ in air and in nitrogen in this study. The ESR spectra obtained in the process of thermal treatment were originated from two species of free radicals, namely the RO[KG-*2]\5free radicals (R\-1)  and the naphthalene free radicals (R\-2). Based on the above experimental observations, it can be concluded that both free radical species take part in the crosslinking reaction, but  R\-1 plays a more important role.

Key words: ESR, P(EEK-co-20 mol ENEK), thermally-treated, crosslinking, radical

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