The microstructure of poly(divinyl acetal)s as determined by 13c NMR spectroscopy. ring stereochemistry and isomerization propagation

Mitsuo Tsukino, Toyoki Kunitake

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Divinyl formal, acetaldehyde divinyl acetal, and acetone divinyl acetal were polymerized freeradically, and the polymer structures were determined by detailed analyses of C NMR spectra. The carbon chemical shifts of various structures which might be formed by simple propagation, by cyclopolymerization, and by isomerization propagation were derived from those of a variety of model compounds and their combinations. All the polymers contained the cis-4, 5-disubstituted-1, 3-dioxolane ring as the predominant structural unit in the main chain (ca. 75%) and as the pendent group (ca. 25%). The latter structure was formed by hydrogen abstraction of the propagating methylenedioxolane radical from the neighboring methylene group. Similar hydrogen migration conceivably occurred also during the polymerization of diallylamines.

Original languageEnglish
Pages (from-to)437-447
Number of pages11
JournalPolymer Journal
Volume11
Issue number6
DOIs
Publication statusPublished - Jun 1979

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry

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