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Review Article Open Access
The solid state characterization of stereoregular poly vinyl chloride (PVC) prepared by urea clathrate polymerization was carried out in comparison with free radically prepared sample by using various instrumental analyses. The principle of urea clathrate polymerization by inclusion phenomenon was described from a purely experimental point of view. The stereo-chemical difference of the resulting PVC appeared in discoloration, solubility into solvents, IR, DSC, and TG curves. Solid state 13C NMR spectra also clearly indicate the structural difference of this polymer. In FT-IR spectra, particularly, Krimm’s novel results were confirmed in the 700-600 cm-1 region. A new characteristic band (at 2933 cm-1) appeared which was explained in terms of Fermi resonance, the enhanced intermolecular hydrogen bonding in highly ordered syndiotactic sequences. In the dynamic ESR measurements in the solid state, signal intensity of the bulk PVC increased rapidly, which was directly connected with TG curve under the linear heating conditions (~10°C/min).
Stereoregular PVC, Urea canal polymerization, Inclusion phenomenon, IR spectra, Solid state 13C NMR, ESR measurements, Stereoregular PVC, Urea canal polymerization, Inclusion phenomenon, IR spectra, Solid state 13C NMR, ESR measurements