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Thermal crosslinking behavior of poly (aryl ether ketone) copolymers containing naphthalene moieties
Author(s) -
Niu Yaming,
Wang Guibin,
Zhang Suxia,
Na Ying,
Jiang Zhenhua,
Dong Fengxia,
Zheng Yingguang
Publication year - 2005
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1675
Subject(s) - ether , polymer chemistry , copolymer , radical , ketone , differential scanning calorimetry , naphthalene , diphenyl ether , electron paramagnetic resonance , aryl , chemistry , free radical reaction , photochemistry , materials science , organic chemistry , polymer , alkyl , physics , nuclear magnetic resonance , thermodynamics
A series of poly[(ether ether ketone)‐ co ‐(ether naphthalene ether ketone)] (P(EEK‐ co ‐ENEK)) copolymers were heated under a variety of conditions. The thermal crosslinking behavior was monitored by differential scanning calorimetry (DSC), electron spin resonance (ESR) and wide‐angle X‐ray diffraction (WAXD). The results indicate that under a non‐oxidative environment such as nitrogen P(EEK‐ co ‐ENEK) is more stable, while under oxidative conditions a crosslinking reaction takes place that causes a reduction in the crystallizability of the copolymers, and an increase in the concentration of free radicals on the copolymer. ESR results suggest that the crosslinking reaction proceeds via free radicals. Subsequently two kinds of free radicals were characterized: one is an RO • type free radical and the other is a naphthalene ring free radical. Copyright © 2004 Society of Chemical Industry