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Thermal oxidative studies of poly(hexafluoropropene oxide) fluids
Author(s) -
Paciorek K. J. L.,
Kratzer R. H.,
Kaufman J.,
Nakahara J. H.
Publication year - 1979
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/app.1979.070240601
Subject(s) - oxidizing agent , oxide , alloy , hydrogen , oxygen , degradation (telecommunications) , decomposition , materials science , metal , thermal decomposition , chemistry , chemical engineering , polymer chemistry , inorganic chemistry , organic chemistry , telecommunications , computer science , engineering
Elucidation of mechanisms operative in thermal oxidative degradation of hexafluoropropene oxide derived polyethers and the effect of metals on these processes are reported. Thermal oxidative instability of a commercial fluid, at moderate temperatures (550°F), was found to be due to the presence of ∼3% of thermooxidatively unstable chains believed to be hydrogen terminated; treatment at 650°F in oxygen volatilized these chains by unzipping. The resultant fluid was unaffected by oxygen at 650°F and by M‐50 and Ti(4Al, 4Mn) alloys at 600°F in oxidizing atmospheres. M‐50 alloy catalyzed the degradation of the hydrogen‐terminated chains below and at 600°F, but after completion of this process did not affect the remainder of the fluid at these temperatures. At 650°F a chain scission process promoted by the metals constituting the alloy, or their oxides or fluorides, came into play. Ti(4Al, 4Mn) alloy in the presence of CF 3 COF and COF 2 species, formed via decomposition of the hydrogen‐terminated chains, degraded poly(hexafluoropropene oxide) fluids at 550°F by chain scissions.