Photodecomposition polystyrene

In the photodecomposition of polystyrene-bound cobaloximes, the polymer chain decreases the mobility of bis(dimethylglyoximato)pyridinecobalt(L) and increases the probability of recombination of L and a radical fixed on the polymer chain. Retardation of the dissociation resulted in a larger equilibrium constant for the polymeric system than that for the analogous monomeric system.130... 

Subramanian [18] has used gas chromatography-mass spectrometry to study the photodecomposition products such as benzaldehyde, a-hydroxyacetophenone, phenyl glycol, a-methoxyacetophenone, and a-henzyloxyacetophenone produced upon UV irradiation of polystyrene peroxide. Diaz and co-workers [19] carried out similar studies on polybenzyl methacrylates and polybenzyl acrylates. 

Subramanian [43] subjected polystyrene peroxide to ultraviolet radiation and analysed degradation products produced during photodecomposition by GC-MS. These included benzaldehyde, a-hydroxy acetophenone, phenyl glycol, a-methoxy acetophenone and a-benzyloxy acetophenone. 

The gas chromatogram of the products formed in polystyrene peroxide photolysis is shown in Figure 6.5. The GC peaks 1, 3, 4 and 6 are attributed to the products formaldehyde, benzaldehyde, a-hydroxy acetophenone and phenyl glycol, respectively, and were identified by their characteristic MS [44, 45]. The MS of two of the photodecomposition products (GC peaks 4 and 7 due, to a-methoxy acetophenone and a-benzoyloxy acetophenone), respectively, are given in Figure 6.6. 

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