Infrared spectrum of polyvinylidene chloride. I

• Published in: Journal of polymer science 1959-05, Vol.37 (131), p.251-261
• Main Authors: Narita, S., Ichinohe, S., Enomoto, S.
• Format: Article
• Language: English
• ISSN: 0022-3832; 1542-6238
• DOI: 10.1002/pol.1959.1203713119

In order to assign the infrared spectrum of polyvinylidene chloride, we studied the properties of the bands in the spectrum of this polymer and the spectrum of polyvinylidene bromide. We found that many bands disappeared or became weak in the region of 400 to 700 cm.−1, when polyvinylidene chloride was molten. From the relation between the absorption intesities and the density of the polymer, we could prove that the two bands at 753 and 884 cm.−1 are crystallization‐sensitive bands. The doubt at 1046 and 1071 cm.−1 in the spectrum of polyvinylidene chloride showed an interesting behavior, i.e., one component at 1046 cm.−1 appeared more strongly than the other at 1071 cm.−1 in the spectrum of the unstretched sample, and their intensity relation was inversed by stretching the sample. The infrared spectrum of polyvinylidene bromide resembled very well to the spectrum of polyvinylidene chloride. We assigned several bands in the spectrum of polyvinylidene chloride from their polarizations and spectral regions, i.e., the doublet at 1046 and 1071 cm.−1 is assigned to the skeletal stretching mode, the parallel brand at 1357 cm.−1 to the CH2‐‐wagging mode, the perpendicular band at 1407 cm.−1 to the CH2‐‐bending mode, the band at 2966 cm. −1 to the CH2‐symmetric stretching mode, and the band at 3010 cm.−1 to the CH2‐antisymmetric stretching mode.