1H-NMR/13C-NMR studies of branched structures in PVC obtained at atmospheric pressure

Summary The ¹H-NMR-spectra of raw poly (vinyl chloride) obtained at atmospheric pressure (U-PVC) have revealed the presence of high concentrations of branches. The content of labile chlorine was determined by reaction with phenole in order to estimate the branch points with tertiary chlorine. The branch length of reductively dehalogenated U-PVC by¹³C-NMR analysis have provided evidence for both short chain branches including chloromethyl groups and 2.4-dichloro-n-butyl groups and long chain branching. For a number of U-polymers the total amount of branching ranges from 7.5 to 13.5/1000 C. The ¹³C-NMR measurements point to a ratio of methyl/butyl branches of 1 1 and short chains/long chains of 6 1 .