1984 Volume 41 Issue 7 Pages 397-405
In order to make clear the effect of rolling on the melting behavior of polytetrafluoroethylene (PTFE), samples of PTFE raw tape (R-tape) and of the tape stretched at high temperature (S-tape) were rolled to various proportions and then examined by thermal analysis (thermomechanical analysis (TMA) and differential thermal analysis (DTA)) and electron microscopy. The rolling has no significant effect on the TMA thermograms of R-tape. But for S-tape, the strong rolling had an effect resembling the short time sintering on the structure, and distinct differences appeared on the TMA thermograms. When PTFE samples were heated to various temperatures in the melting region, the DTA thermograms altered from the complex melting form containing shoulders to clear double peaks. The samples heated above the melting point gave a single peak like that of the sintered sample.
