C-13 NMR characterization of random ethylene-vinyl chloride copolymers.
01 January 1985
A complete series of ethylene-vinyl chloride (E-V) copolymers have been prepared by reductive dechlorination of poly(vinyl chloride) (PVC) with tri-n-butyltin hydride. C-13 NMR was employed to determine the microstructure of each E-V copolymer including the overall comonomer composition and sequence and the stereosequence of neighboring vinyl chloride (V) units. Our detailed analysis of E-V microstructure by C-13 NMR was made possible by comparison of the observed spectra with the C-13 NMR chemical shifts previously calculated for these copolymers based on gamma-gauche shielding effects.