Studies of the photochemistry of poly(p-propionylstyrene)

✍ Scribed by Neil A. Weir; Jerzy Arct; Kenneth Whiting

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 327 KB
• Volume: 26
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(90)90251-x

✦ Synopsis

Films of poly(p-propionylstyrene) were exposed to long-wave u.v. radiation (2 >_-300 nm) under high vacuum at 25 ° . The volatile products were quantitatively analyzed by mass spectrometry. The principal initial photoreactions are Norrish Type I ~-cleavages but some//-cleavage also occurs with the formation of methyl radicals. The resulting free radicals participate in abstraction reactions with the polymer. Cross-linking occurs by the interaction of a variety of macroradicals. The importance of the carbonyl triplet is demonstrated and its lifetime, as determined by time-resolved spectroscopy and laser flash photolysis, is 147 __+ 10% nsec. The polymer is less susceptible to photodegradation than poly(p-acetylstyrene).