Sequence and composition of an amino ethylene-ethylene sulfonate copolymer by carbon-13 nuclear magnetic resonance

Abstract

13C NMR spectra of a series of aminoethylene‐ethylenesulfonate copolymers of varying composition have been taken. It has been found that the methylene groups of the copolymer are clear indicators of amine–amine, sulfonate–sulfonate, and amine–sulfonate sequence diads. Combinations of peak areas with composition data from elemental analysis allows quantitative determination of diad frequencies. Once elemental analysis data for several copolymer compositions have been obtained ratios of peak areas may be used to determine unknown polymer compositions with excellent sensitivity.