Hydroperoxide groups polystyrenes

The new suggestion proposed for polystyrene by Rabek and BAu1>y (57) considers the formation of hydroperoxide groups along oT polymer chain from a reaction of singlet oxygen with... 

Breck at al (68) havs recently examined the reactivities of a number of saturated and unsaturated polymers towards singlet oxygen generated by microwave generator. The saturated ohain polymers as polystyrene,polyurethane and polyethylene were found to be inert within the experimental conditions with singlet oxygen,while the unsaturated polymers as poly-dienes were found to react quite readily.In this paper concentration of hydroperoxide groups has been measured. 

A broad peak at 3200-3500 cm appears as a result of hydroxy/ hydroperoxide group formation. The peak at 1720 cm- emerges and it can be attributed to the formation of carbonyl groups. Formation of these bands is characteristic for the photo-oxidation of both polystyrene (15,23) and polyester (14) samples. 

Sensitization of degradation has been achieved by copolymerizing acenaphthylene, and chloromethyl vinyl ketone. The mode of action of benzo-phenone has been attributed to its ability to sensitive decomposition of hydroperoxide groups. Blends of polystyrene with poly(phenylene oxide) have attracted some attention. " It is worth noting that the last paper reports that singlet oxygen had no effect on pure polystyrene or its blends. ... 

Photolysis of oxidative products (hydroperoxide groups, chain peroxides and ketonic groups) formed during the preparation of polystyrene. If hydroperoxides are present (Fig. 3.51) the oxidation rates are increased, and degradation can also be induced in the anionic polystyrene. 

IR spectra of [PdCy groups fixed on surfaces of Amberlite A-27, Dowex-1 and polystyrene-divinylbenzene resins containing -N (0113)3 surface groups and Cl , were examined by impregnating the polymers with K2PdCl4 solutions [201]. The supported salts were active in decomposing c clohexyl hydroperoxide to tni/u-2-hexanal. Nonetheless, the same results were obtained with soluble analogues of these catalysts when diffusion was unhindered in the reaction process. 

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