Crosslinking of poly(vinyl chloride)—I. Grafting of vinyltri(alkoxy)silanes using UV irradiation

✍ Scribed by V. P. Gupta; G. R. Brown

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 160 KB
• Volume: 69
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980906)69:10<1901::aid-app2>3.0.co;2-i

✦ Synopsis

In a nitrogen atmosphere the UV irradiation of thin PVC films (ca. 0.1 mm thick) containing vinyltri(isopropoxy)silane results in a grafting reaction. By appropriate choice of conditions, dehydrochlorination can be kept to a minimum while up to 60% gel content is realized. Reaction of the pendent alkoxy groups, either with HCl byproduct or subsequent hydrolysis by exposure to water, results in the formation of Si-O-Si bonds that serve as chemical crosslinks. Although the addition of photosensitizers favors the grafting reactions at short exposure times, the ultimate level of crosslinking is greatly diminished by their presence.