Polymerization of higher aldehydes. VII. Tacticity of elastomeric polyacetaldehyde,

Publisher Website
Google Scholar
Abstract
High resolution NMR spectroscopy was used to determine the tacticity of elastomeric polyacetaldehyde. Spectra obtained at elevated temperatures and in solutions of carbon tetrachloride and tetrachloroethylene showed a weak line on the high field side of a strong line in both the methyl group and the CH group regions. Comparison of these results with those obtained on related model compounds indicated that the weak lines can be attributed to the isotactic structure and that the strong lines can be assigned to the heterotactic structure. After the lines were narrowed by spin‐decoupling procedures, the area measurement results suggested that polyacetaldehyde is a highly random polymer.