The tl:erma.l properties of polytetra~~oro e thyl ene (Teflon ) .samples were investigated, uStng an ad l abatJc~vacuum calonmeter.Ihe effect of the annealll1g and quenchtng processes on the heat capacity of a mold ed T eflon sample was studied.The heat-capacity data were used to compute the heat capacity, enthalpy, and entropy of the polymer samples at 5-deg intervals from 0 0 to 365 0 K.The heat-capacity results \\'it h the molded, annealed, and que nched samples of Teflon show the possibility of a glass transformation at about 160 0 K.The lack of a more definite glass-transformation er-fect is attributed to inter-and intramolecular hindrances to configurational changes in the Tefion polymer.The existence of fil'storder transitions at 293 0 and 303 0 K , previously reported by Quinn , Roberts, and , ,yas confirmed.
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Furukawa et al. (1952) studied this question.