High-temperature aging of fluoropolymers

✍ Scribed by Brown, Daniel W. ;Wall, Leo A.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1972
• Tongue: English
• Weight: 720 KB
• Volume: 10
• Category: Article
• ISSN: 0449-296X
• DOI: 10.1002/pol.1972.170101015

✦ Synopsis

Abstract

Fluoropolymers including those of 3,3,3‐trifluoropropene, 2,3,3,3‐tetrafluoropropene, 3,3,4,4,5,5,5‐heptafluoropentene‐1, and their copolymers with tetrafluoroethylene, were aged in air and in its absence at 225 and 305°C. Intrinsic viscosities were measured before and after aging. Polymers of high tetrafluoroethylene content are most stable. In air the presence of tertiary hydrogens is associated with lowered stability but the presence of tetrafluoroethylene greatly mitigates this effect. Stress‐relaxation studies in air of a vulcanizate of 3,3,3‐trifluoropropene and tetrafluoroethylene cured by γ‐rays indicate that the vulcanizate degrades much more rapidly than the untreated polymer.