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Radiation chemistry of poly(tetrafluoroethylene‐ co ‐perfluoromethyl vinyl ether): Effects of oxygen and crystallinity
Author(s) -
Forsythe John S.,
Hill David J. T.,
Calos Nicholas,
Logothetis Anetis L.,
Whittaker Andrew K.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990801)73:5<807::aid-app21>3.0.co;2-f
Subject(s) - tetrafluoroethylene , crystallinity , polymer chemistry , vinyl ether , ether , oxygen , materials science , chemistry , organic chemistry , polymer , copolymer , composite material
The presence of oxygen had a varied effect on the γ‐radiolysis of the amorphous copolymer, poly[tetrafluoroethylene‐ co ‐perfluoro(methylvinyl ether)] (TFE/PMVE), depending upon radiolysis conditions. Radiolysis undertaken in stages, up to a dose of 1500 kGy (1 rad = 10 −5 kGy) in the presence of air, resulted predominantly in chain scission and a wax‐like substance was produced; whereas, other studies have shown that continuous radiolysis of the polymer produced a crosslinked network. Radiolysis of semicrystalline TFE/PMVE in vacuum up to a dose of 4200 kGy produced little change in the crystalline content. Crosslinking, however, predominated in the amorphous regions, which had the effect of lowering the crystallization temperature upon cooling from above the crystalline melt. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 807–812, 1999