NASA Technical Memorandum (102116)
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.
Thermal stability, perfluoroalkylethers, tensimetry
Helmick, L. S. (1989). Determination of the Thermal Stability of Perfluoroalkylethers by Tensimetry: Instrumentation and Procedure. NASA Technical Memorandum (102116).