含萘聚芳醚酮共聚物热处理后产生自由基的ESR谱

萘环摩尔含量20%的聚芳醚酮（PANEK）无规共聚物在340 ℃空气条件下发生交联反应，经过不同时间的热处理后，在室温检测热处理后产生的自由基ESR谱. 它们都有一条较强的单峰，随着热处理时间的增长，自由基ESR谱的幅度增强，将微波功率加大到200 mW, 谱线发生明显的变化，出现两条重叠在一起的谱线，说明含萘环聚芳醚酮在热处理过程中产生了两种不同的自由基. 文中模拟、讨论了热处理过程中产生的两种自由基的归属，一种是RO·自由基，另一种是萘自由基，它们都参与交联反应，RO·自由基起主要作用.

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

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.