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Study of the effect of the chloroallyl group content on the thermal dehydrochlorination of PVC

✍ Scribed by Z. Vymazal; L. Mastný; Z. Vymazalová

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
311 KB
Volume
21
Category
Article
ISSN
0014-3057

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✦ Synopsis

The chloroallyl group contents of PVC and its low molecular weight fractions, soluble in chloroform or acetone, have been determined on the assumption that the reaction of AgNO~ with labile chlorine atoms occurs only with the allylic chlorines. Their amount is highest in the low molecular weight fractions. The thermal stability of the polymer in inert atmosphere increases if these groups are removed. Neither the labile chlorine content nor the dehydrochlorination rate (in the subsequent degradation) of the initial polymer, or the fractions insoluble in the two solvents, is affected by heat treatment at 180 ° for 60 min, whereas the amount of labile chlorine in the low molecular weight fractions increases on heat treatment exceeding 30 min. No direct dependence of the dehydrochlorination rate on the amount of labile chlorine in the polymers under study has been established.

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