✦ LIBER ✦

Photolysis of poly(p-isopropyl styrene)

✍ Scribed by N.A. Weir; T.H. Milkie

Publisher: Elsevier Science
Year: 1980
Tongue: English
Weight: 412 KB
Volume: 16
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(80)90060-9

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✦ Synopsis

The photodegradation of films of poly(pisopropyl styrene) with 254nm radiation at 10 -~ mbar and 25 + I ° has been studied. The principal product is hydrogen but smaller quantities of methane and ethane and a trace of propane are also formed, indicating that the p-substituent also undergoes decomposition. Ultraviolet spectra show rapid changes, particularly in the 230-240nm region, and a long wave absorption system extending into the visible region also appears. Solubility data indicate the simultaneous occurrence of cross-linking and chain sclssion, rates of both processes being significantly greater than those for poly(styrene); these results are explicable in terms of the inductive (+ I) stabilization (due to the p-C3H~ group) of radicals formed on chain scission and of the participation of the p-C3H~ group in addition reactions. Quantum yields for the evolution of the gaseous products have been estimated.

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