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The trend of the room‐temperature transitions of native polytetrafluoroethylene versus annealing temperature has been studied. A method of deconvolution for the calorimetric curves C p ( T ), based on Pearson VII type functions and the Marquardt's nonlinear leastsquares method, allowed the evaluation of the temperatures and of the heat of each transition. Annealing at 330°C determines the loss of the crystalline fraction responsible of the lowest room‐temperature transition. An interpretation of the lowest room‐temperature transition is suggested.
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Villani et al. (1991) studied this question.
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