Abstract
Transitions in polyfluoroethylene (Teflon) have been studied as a function of pressure and temperature. A high-pressure transition (5, 000 atm) and a lower pressure transition were studied. These are believed to result from three polymorphic forms. The pressure of the high-pressure transition decreases and that of the low-pressure transition increases with increasing temperature. A triple point is indicated at approximately 70° C, and a third equilibrium line is found to proceed to higher pressures with increasing temperature from this point. Experimental errors involved render tests of all thermodynamic conditions at the triple point indeterminate.
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