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Unformatted text preview: Photolysis in the presence of oxygen also results in dehydrochlorination together with chain scission and cross-linking. Cl Cl-PVC CH 2-CH-CH 2-CH-CH=C- Cl* + * CH 2 O H CH 2-C chain scission O 2 crosslinking * uv Cl CH 2-C PVC labile tertiary Cl PVC- HCl-CH 2-CH-CH 2-CH-Cl Cl-CH 2-CH-CH 2-CH-CH 2-C Cl Cl- HCl Unzipping sequential elimination due to allylic activation-CH=CH-CH=CH-CH=C PVC In addition to polyene formation, photodehydrochlorination of PVC also leads to cross-linking and chain scission....
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