Abstract
Photo-degradation in the solid phase of styrene copolymers bearing pendent acyloxyimino (AOI) groups has been investigated. The photo-degradation of the copolymers was carried out in the presence of benzophenone as sensitizer using 366 nm radiation in air at room temperature. Main-chain scissions of the copolymers occur via the oxidation of polymer radicals which are produced by the photolysis of AOI groups. The efficiency (β) of main-chain scission compared with the decomposition of AOI groups has been found to increase with increase in the content of AOI groups in the copolymers and with the extent of decomposition of AOI groups. The increase in β is explained as follows: (i) The increase in the content of AOI groups in the copolymers promotes an increase in the mutual recombination of imino radicals, which leads to an increase in the polymer radicals. (ii) The double bonds which are introduced by the photolysis of AOI groups assist the photo-degradation by lowering the glass transition temperature of the copolymers and act as photo-sensitive groups which induce main-chain scission.
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