Photolysis of poly(p-isopropyl styrene) |
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Authors: | N.A. Weir T.H. Milkie |
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Affiliation: | Chemistry Department, Lakehead University, Thunder Bay, Ontario, Canada, P7B 5E1 |
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Abstract: | The photodegradation of films of poly(p-isopropyl styrene) with 254 nm radiation at 10?6mbar and 25±1° 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 230–240 nm 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 scission, 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-C3H7 group) of radicals formed on chain scission and of the participation of the p-C3H7 group in addition reactions. Quantum yields for the evolution of the gaseous products have been estimated. |
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