Information on the Crystallization-Sensitive Band at 8.7μ of Polyvinyl Alcohol

Abstract

The infrared spectra of PVA model, PVA and copolymer of vinyl alcohol have been investigated at about 9μ region to obtain some informations on the crystallization-sensitive band at 8.7μ of PVA. Then, the following facts were observed:(1) in PVA model, namely heptanetriol-2, 4, 6 and pentanediol-2, 4, the analogous bands to the crystallization-sensitive band of PVA appeared at nearly the same position, (2) the analogous band locations did not almost shift on deutration, just like PVA (3) the existence of crystallization-sensitive band even for the PVA whose polymerization degree was several tens, (4) no observations of crystallization-sensitive band for concentrated aqueous solutions of PVA and their gels. From such observations and data by another authors, it may be infered that the crystallization band will be associated with the coupling mode between C-C vibration of trans conformation and C-O vibration in that which formed intramolecular hydrogen bond in the crystalline region. It was also discussed about the assignment for another bands at 9p region of PVA.