Abstract
The crystallization behavior of poly(trifluoroethylene) (PTrFE) has been studied. An electron micrograph of a fractured surface of PTrFE shows the characteristics of lamellar spherulites. The equilibrium melting temperature of PTrFE was found to be 213°C from the plot of the crystallization temperature vs. the observed melting temperature. The heat of fusion and the entropy of fusion were found to be 1300 cal mol−1 and 2.75 eu mol−1, respectively, from the analysis of polymer–diluent melting data. The surface free energy of the lamella of PTrFE was found to be about 1.2 kcal mol−1 from the melting temperature–lamellar thickness data obtained from the small angle X-ray diffraction method. The crystallization rate of PTrFE was studied by the calorimetric method. The Avrami exponent was found to be about 2.7, and the surface free energy of lamella obtained from the crystallization rate was about 0.79 kcal mol−1. This value seems to give a fairly good agreement with the above results derived by the small angle X-ray diffraction method.
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Yagi, T. Heat of Fusion and Crystallization Kinetics of Poly(trifluoroethylene). Polym J 12, 9–15 (1980). https://doi.org/10.1295/polymj.12.9
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DOI: https://doi.org/10.1295/polymj.12.9