Saturated irregular structures in poly(vinyl chloride)

✍ Scribed by L. Valko; I. Tvaroška; P. Kovařik

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 425 KB
• Volume: 11
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(75)90025-7

✦ Synopsis

The semiempirical method proposed by Vedeneyev was used to stud? the (7 CI, (" H and C--C bonds in poly(vinyl chloride). Activation energies for elimination of hydrogen chloride were calculated on the principle of the additivit3 of bond energies of the four-membered activated complex, for various saturated abnormal structures in the polymer molecule, such as branching and head-to-head or tail-to-tail addition. Some possible saturaled abnormalities controlled b3 polymerization conditions make only small contributions to initiatima of lhermal dehydrochlorination but branched structures having a tertiary chlorine appear to have a significant effect. A monomolecular hydrogen chloride elimination mechanism is schematically illustrated and discussed on the basis of Goddard's orbital phase contmuit_\ principle.