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Spectroscopic studies of the oxidation of poly(2,6-dimethyl-1,4-phenylene ether) as a function of molecular weight

✍ Scribed by Takao Usami; Yukari Kogawa; Shigeru Takayama; Toshiyuki Koyama

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 195 KB
Volume: 26
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(90)90231-r

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✦ Synopsis

The oxidation of Ix)ly ( 2,6-dimethyl-C, 4-phenylene ether) (PPE) during polymerization has been examined as a function of molecular weight, using spectroscopic techniques. The visible light absorption and the IR absorption at 1660cm -I increased as the molecular weight decreased. A most probable chromophore may have a xanthone-like structure and be present near the polymer chain-end. The 13C-NMR spectra for fractions of various molecular weights from a PPE sample indicate that the increase in chain mobility around the chain-end is a major reason for the higher activity in the oxidation.

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