Abstract
Equations of state were determined separately for the crystalline and amorphous parts of Form I and II samples of poly(vinylidene fluoride), assuming a linear relation between the specific volume and the degree of crystallinity. The compressibility data of Form II bulk samples were obtained by dilatometry, and those of the Form I and II crystals were determined by X-ray diffraction at high temperature. Ultrasonic sound velocities of Form I and II crystals were obtained as functions of pressure and temperature, using the logarithmic mixture law for sound velocity. The pressure dependences of the Grüneisen constants γ and interchain specific heats Cinter were derived for Form I arid II crystals at room temperature. Form I crystals had somewhat larger compressibilities than those of Form II throughout the whole range of temperature investigated, and had a larger γ and smaller Cinter at atmospheric pressure, but smaller γ at high pressures above 2000 kg cm−2. The pressure dependences of γ and Cinter were stronger in Form I than in Form II. On the basis of these facts, the difference in behavior of the lattice vibrations of these two crystals under high pressure is discussed.
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Tanaka, H., Takayama, K., Okamoto, T. et al. Equations of State for Poly(vinylidene fluoride). Polym J 14, 719–727 (1982). https://doi.org/10.1295/polymj.14.719
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DOI: https://doi.org/10.1295/polymj.14.719