Abstract
The thermal stability and degradation mechanism of a multiply alkylated cyclopentane and perfluoropolyether is investigated as a function of aluminum oxide, exposure time and environmental conditions. It is found that the multiply alkylated cyclopentane does not catalytically react with Al2O3 since fluorine atoms and acetal units leading to Lewis acid are absent in cyclopentane molecules. However, the multiply alkylated cyclopentane is affected by temperature leading to thermal oxidation. The perfluoropolyether is strongly affected by the presence of Al2O3 leading to chain scission at both mid and end-chain. This results in faster weight loss than for the multiply alkylated cyclopentane, i.e., the thermal stability of the multiply alkylated cyclopentane is superior to that of the perfluoropolyether. Presented as a Society of Tribologists and Lubrication Engineers Paper at the ASME/STLE Tribology Conference in Cancun, Mexico October 27–30, 2002
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