Catalytic Degradation of a Perfluoroalkylether in a Thermogravimetric Analyzer

Abstract

Catalytic degradation of perfluoroalkylethers (PFAEs) by various substrates can be a significant problem, resulting in the formation of corrosive degradation products and loss of lubricant. The determination of catalytic degradation of a linear PFAE (PFAE-D) by various substrates was made by controlled-diffusion thermogravimetric analysis. The use of a sealed gold pan with a small pinhole in the lid allowed for the measurement of catalytic degradation of PFAE-D by increases in the rate of volatilization relative to a control. Catalytic degradation was observed under ramped conditions (to 500°C) for most commonly used metals and alloys except Inconel 600, silver and pure silicon nitride. Analysis of degradation products confirmed that degradation was occurring by a molecular disproportionation reaction. Milder isothermal conditions (300° C) resulted in catalytic degradation for aluminum, M-50 steel, carbon-carbon composite and some binder components used in silicon nitride balls.

Presented at the 53rd Annual Meeting in Detroit, Michigan May 17–21, 1998

Notes

Presented at the 53rd Annual Meeting in Detroit, Michigan May 17–21, 1998