Conversions of structural groups during the degradation of vinylchloride and vinylacetate polymers

摘要: Abstract Industrial and laboratory samples of PVC PVA contain 5 × 10 −3 mole/mole polymer unsaturated end groups, however, PVA, unlike is practically free from internal 〉C=C〈 bonds. It was established that at the initial stages overall-deacetylation only takes place as a result statistical elimination CH 3 COOH macromolecules. During thermal degradation structural groups undergo conversion to form polyconjugated sequences. Statistical in same way HCl k s = 0·8 −7 sec −1 , 175°) independent type sample with rate constant 0·7 −8 (175°). Crosslinking macromolecules, contrast PVC, occurs readily degradation, when no long polyene sequences are formed by mechanisms different those PVC: process terminal bonds polymer, or intermolecular deacetylation, etc.