Vibrational spectra and conformation of poly(vinylidene chloride)

Abstract Infrared and Raman spectra of poly(vinylidene chloride) (PVDC) single crystals are presented. Additionally, we report infrared spectra of a quenched, largely amorphous, sample of PVDC. Our results question the interpretation of previous vibrational studies of PVDC which conclude that the crystalline polymer chain is in the TGTG′ conformation. Strong Raman lines at 688 and 161 cm−1 together with weaker lines at 3000, 345, and 143 cm−1 which are either absent or, at least, extremely weak in the infrared spectrum of the crystalline polymer suggest that a planar 21 helical conformation is more consistant with the vibrational data.

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