Abstract
Crystallizations of poly(chlorotrifluoroethylene)(PCTFE) from dilute solution and from the melt of dispersion powder at atmospheric pressure and from the melt of the bulk material under high pressure have been carried out and examined by electron microscope. A folded-type single crystal of hexagonal shape has been obtained from dilute solution of p-xylene and that of irregular shape has been obtained from the melt of dispersion powder.To determine the optimum crystallization temperature under high pressure, DTA measurements have been carried out and the melting and recrystallization curves have been obtained. Remarkable increase of Tm with respect to pressure (dTm/dP=60°C/1000 kg/cm2) has been observed. Experiments on the crystallization have been performed on the basis of these data. The fracture surface of the bulk sample crystallized under high pressure shows a completely developed band structure. In this polymer this structure has been obtained easily by the application of pressure of only a few hundred kg/cm2. From the examination of X-ray fibre pattern of stretched film crystallized under high pressure, a 17 monomer 1 turn helix configuration has been determined.
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Miyamoto, Y., Nakafuku, C. & Takemura, T. Crystallization of Poly(chlorotrifluoroethylene). Polym J 3, 122–128 (1972). https://doi.org/10.1295/polymj.3.122
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DOI: https://doi.org/10.1295/polymj.3.122
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