Short branching in poly(vinyl alcohol). II. NMR spectroscopy of model polymers of short-branched poly(vinyl alcohol)

In order to develop a method of measuring the amounts of short branches in PVA, an NMR study was made of a model poly(vinyl alcohol) having short branches, one or two monomer units in length. Detection and estimation of the short branches were shown to be possible by using the ¹³C-NMR spectra of PVA and the ¹H-NMR of acetylated PVA. In the ¹⁹F-NMR spectra of trifluoroacetylated model PVA, the resonance peaks of primary and tertiary alcohols in the branching structure were not well resolved from that of secondary alcohol of the main chain.