Science and Mathematics Faculty Publications

Document Type

Technical Memorandum

Publication Date

10-1989

Journal Title

NASA Technical Memorandum (102116)

Abstract

A computerized tensimeter and experimental procedure for determination of the thermal decomposition temperature (Td) of perfluoroalkylethers have been developed and tested. Both the I+ m apparatus and the procedure are described in detail. Results of QU) testing with bis(2-ethylhexyl) phthlalate and trimethylolpropane wI triheptanoate demonstrate that the reciprocal of the decomposition temperature is a linear function of the logarithm of the gas volume/heated liquid volume ratio. The Td obtained for each compound at a gas volume/heated liquid volume ratio of one was similar to the value previously reported using an isoteniscope technique. Results of testing with a polymer of hexafluoropropylene oxide demonstate that this instrument and procedure can be used to determine the Td of perfluoroalkylethers.

Keywords

Thermal stability, perfluoroalkylethers, tensimetry

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