Crystallinity Studies of Polychlorotrifluoroethylene by Infrared Method. I. Measurement of the Degree of Crystallinity

Abstract The crystalline-amorphous ratio, and consequently the degree of crystallinity of polychlorotrifluoroethylene was measured by use of the ratio of observed absorbance of crystalline band at 440 cm.−1 to that of amorphous band at 760 cm.−1. The crystallinity as a function of temperature was measured by this method, and it was in good agreements with that obtained by specific heat methd. Furthermore, a linear relationship between the degree of crystallinity and the specific volume was found, and it leads to extrapolated values of film and 0.4901 and 0.4575 for the specific volumes of completely amorphous and crystalline meterials, respectively.