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Study of polytetrafluoroethylene crystallization

Abstract : Crystallization of polytetrafluoroethylene (PTFE) from the melt state has been studied by wide angle X-ray scattering (WAXS), small angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC) experiments, supported by scanning electron microscopy (SEM) observations. Isothermal crystallization of PTFE (between 315 °C and 325 °C) is analyzed and compared with PTFE cooled at 1 °C/min taken as the reference. We establish a TTC (time, temperature, crystallization) diagram and point out the time and temperature dependence of both crystallite thickness and crystallinity. It appears that the crystallization occurs in a very narrow temperature range. We assign the morphological changes to different crystal growth regimes in the range of study.
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Laurent Ferry, G. Vigier, R. Vassoille, J. Bessede. Study of polytetrafluoroethylene crystallization. Acta Polymerica, Wiley-VCH Verlag, 1995, 46 (4), pp.300-306. ⟨10.1002/actp.1995.010460403⟩. ⟨hal-03272034⟩

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