Photo-oxidative stability and photoyellowing of electron-beam cured multifunctional di- and triacrylate resin films

✍ Scribed by Norman S. Allen; Peter J. Robinson; Nicholas J. White; Roy Clancy

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 302 KB
• Volume: 25
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(89)90066-9

✦ Synopsis

AMtract--The photo-oxidative stabilities of electron-beam cured multifunctional di-and triacrylate resin films have been studied by measuring the growth in hydroxyl absorption at 3450 cm-I and decrease in that of alkyl hydrogens between 2878-2889 cm-t using high resolution i.r. spectroscopy. Photoyellowing of the amine terminated diacrylate resin was monitored by measuring the increase in absorption at 275 nm using second derivative absorption spectroscopy. For both resin structures, photo-oxidative stability is markedly influenced by the electron-beam dose, probably via the level of residual unsaturation and crosslink density of the cured films. Photoyellowing on the other-hand is not influenced by the electron-beam dose, confirming our earlier findings that this phenomenon is due solely to the terminal dialkylamino group. It is concluded that, although residual unsaturation appears to play an important role in controlling the photo-oxidative stability of the resin film, it is unimportant in inducing the photoyellowing.