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Temperature dependence of d 200,110-spacing in vinylidene fluoride (VDF)-trifluoroethylene copolymer crystals with VDF molar contents of 65 and 57% is measured at 0.1, 100, 200 and 300 MPa. In the crystal with 65% of VDF, continuous structural change transforms into the first-order phase transition at 300 MPa, suggesting a critical point in the P–T phase diagram of the crystal. Such phenomena is attributed to a decrease in the intermolecular distance with pressure, affecting the intermolecular Lennard-Jones potential to a greater extent than the electrostatic interaction.

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