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• W2000882034 abstract "Internal double bonds were determined by oxidative cleavage in fractions of a commercial suspension PVC (S-PVC) and experimental PVC samples obtained at subsaturation conditions (U-PVC). The changes in molecular weight were measured by g.p.c. and viscometry. The oxidation was performed by ozonolysis in tetrachloroethane solution at −20°C. Oxidation by potassium permanganate in dimethylacetamide solution at −10° to +50°C was also studied. However, this method was found to give erratic results. With increasing monomer starvation the number of internal double bonds increased. In the original S-PVC sample the internal double bond content was 0.21000VC. The formation of double bonds is assumed to be the result of an increased tendency, by chlorine atoms, to attack on the methylene groups in the chain. Hydrolytic cleavage and 1H n.m.r. measurements did not give any evidence of ketoallylic groups. With increasing chloroallylic group content the U-PVC samples showed an increased rate of dehydrochlorination at 190°C in nitrogen. The S-PVC fractions, however, showed a decreased rate. However, the thermal stability in both series of samples could be related to the tertiary chlorine content. Butyl and long chain points with tertiary chlorine are more frequent than the internal chloroallylic groups. It was assumed that tertiary chlorine is the most important labile structure not only in U-PVC but also in ordinary PVC." @default.
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• W2000882034 date "1983-06-01" @default.
• W2000882034 modified "2023-09-24" @default.
• W2000882034 title "Formation of anomalous structures in PVC and their influence on the thermal stability: 3. Internal chloroallylic groups" @default.
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• W2000882034 doi "https://doi.org/10.1016/0032-3861(83)90004-6" @default.
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