Microstructural studies on U.V.-degraded poly(vinyl chloride) by nuclear magnetic resonance spectroscopy

• Published in: European polymer journal Vol. 31; no. 4; pp. 341 - 345
• Main Authors: Rao, P.V.C., Kaushik, V.K., Bhardwaj, I.S.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-04-1995; Elsevier
• Subjects: Applied sciences; Crosslinking and degradation; Exact sciences and technology; Physicochemistry of polymers; Polymers and radiations; Tacticity; Radiation dose; Dehydrochlorination; Chemical stabilization; Structure modification; Light stabiliser; Polyvinyl chloride; Experimental study; Comparative study; Photochemical degradation
• ISSN: 0014-3057; 1873-1945
• DOI: 10.1016/0014-3057(94)00179-0

Microstructural changes during photodegradation of poly(vinyl chloride) (PVC) samples obtained after different ultra-violet (u.v.) wavelengths were studied by the combined use of
13C and
1H NMR spectroscopy. The samples were characterized by determining tacticity and the length of isotactic and syndiotactic indexes. The Behnisch model was extended to the u.v.-degradation of PVC and degradation parameters were also derived from tacticity data. It was found that the rate of dehydrochlorination
γ
Br
2k
0
increased with an increase in dosage of u.v. radiation, u.v.-degradation studies were also carried out in the presence of different metallic stabilizers and the corresponding structural changes were monitored by NMR spectroscopy.