Surface protection of poly(vinyl chloride) by photografting of epoxy–acrylate coatings

✍ Scribed by Christian Decker

• Book ID: 102736646
• Publisher: John Wiley and Sons
• Year: 1983
• Tongue: English
• Weight: 607 KB
• Volume: 28
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1983.070280109

✦ Synopsis

Synopsis

UV-curable epoxy-acrylate coatings were used to protect poly(viny1 chloride) against superficial degradation. With a-hydroxy-acetophenone photoinitiators, the crosslinking polymerization develops in the ms time scale; 50% degree conversion is reached after irradiation times of 2.5 ms in a nitrogen atmosphere and 17 ms in air. The adhesion of the coating on to the PVC substrate can be greatly improved by inducing a photochemical grafting process. The best results are obtained by incorporating the photoinitiator into the top layer of the PVC sheet. Highly crosslinked epoxy-acrylate coatings are very stable toward UV radiations and chemical agents like organic solvents and strong acids. By their light-screening effect they provide an excellent protection against photodegradation for light-sensitive polymeric materials,