Js. Forsythe et al., Radiation chemistry of poly(tetrafluoroethylene-co-perfluoromethyl vinyl ether): Effects of oxygen and crystallinity, J APPL POLY, 73(5), 1999, pp. 807-812
The presence of oxygen had a varied effect on the gamma-radiolysis of the a
morphous 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 T
FE/PMVE in vacuum up to a dose of 4200 kGy produced little change in the cr
ystalline content. Crosslinking, however, predominated in the amorphous reg
ions, which had the effect of lowering the crystallization temperature upon
cooling from above the crystalline melt. (C) 1999 John Wiley & Sons, Inc.