Summary
In order to obtain the degree of crystallinity of poly(vinylidene fluoride) crystal form II as a function of temperature, the temperature dependences of specific volumes of the crystalline and amorphous phases,\(\bar V_c \) and\(\bar V_a \), respectively, were obtained as follows:
, wheret is the temperature in °C and the unit of ¯V is cm3/g. The value of\(\bar V_c \) was calculated from unit cell determinations by X-ray measurements of a specimen with form II over the temperature range of 20 to 120 °C. The value of\(\bar V_a \) was extrapolated from liquid data based on the analysis of the temperature dependences of the specific volume of the specimen and of\(\bar V_c \).
Zusammenfassung
Um den Kristallisationsgrad von Polyvinylidenfluorid in der Kristallform II als Funktion der Temperatur zu erhalten, wurden die spezifischen Volumina der kristallinen Phasen\(\bar V_c \) und\(\bar V_a \) in folgender Form erhalten:
, wobeit die Temperaturen Grad Celsius und die Einheit von ¯Vcm3/g bedeutet. Die Werte von\(\bar V_c \) wurden aus der Einheitszelle röntgenographisch an Proben der Form II über einen Temperaturbereich von 20–120 °C bestimmt. Die Werte von\(\bar V_a \) wurden aus flüssigen Daten extrapoliert, die aus der Analyse der Temperaturabhängigkeiten des spezifischen Volumens von Proben und ihrem kristallinen Anteil\(\bar V_c \) folgten.
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The authors wish to thank Dr.M. Asahina of the Kureha Chemical Industry Co., Ltd. for providing the samples and ProfessorH. Tadokoro for the use of the X-ray.
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Nakagawa, K., Ishida, Y. Estimation of amorphous specific volume of poly(vinylidene fluoride) as a function of temperature. Kolloid-Z.u.Z.Polymere 251, 103–107 (1973). https://doi.org/10.1007/BF01498933
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DOI: https://doi.org/10.1007/BF01498933