Infrared spectra and crystallization of poly‐3,3‐bis(chloromethyl)oxacyclobutane

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Abstract
The process of crystallization and the characteristics of crystalline poly‐3,3‐bis(chloromethyl)oxacyclobutane were investigated by infrared spectroscopy. A comparison of the spectra obtained when the electric vector was vibrating parallel to and perpendicular to the extended direction of specimens of this polymer showed significant dichroism in the majority of absorption bands; also, intensity changes as crystallization of the polymer proceeded were observed in both types of spectra. The crystallization process was examined by noting changes in the spectra with increase in the temperature of the polymer; many crystallization‐sensitive bands were found. The dichroism was particularly marked in the absorption bands which may be due to the wagging‐mode, twisting‐mode, and rocking‐mode vibrations of the methylene groups in this polymer. Optical densities of the bands a t 1027 cm−1, an amorphous band, and 897 cm−1, a crystalline band, were observed a t various temperatures during cooling of the polymer. By use of a plot of the optical densities of both bands against the temperature of the polymer, the degree of crystallinity of the polymer could be estimated as a function of the polymer temperature. The results are in good agreement with the dilatometric results for the crystallization rate. Also, the polymorphism of the polymer, which had been detected by x‐ray analysis, was investigated by the use of infrared spectroanalysis. On the basis of deductions derived from these experimental results, we hypothesized a macromolecular structure for this polyether.

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