Poly carbonyl group development

Evaluation of IR spectra of acrylonitrile-butadiene-styrene (ABS) after UV irradiation shows that rubber double bands at 965 cm and 910 cm (Fig. 3.65), attributed to poly(trans-l,4-butadiene) and poly(l,2-butadiene), respectively, decrease with exposure time (Fig. 3.66) in a first order reaction, together with the carbon-carbon double stretching band at 3450 cm in addition, a saturated carbonyl band (centred at 1725 cm ) forms (Fig. 3.65) by a first order process (Fig. 3.67). During the initial stages of the photooxidation, bands at 1665, 1685 and 1699 cm due to a- and ) -unsaturated carbonyl groups, develop [1113,1936]. 

As a design to develop a polyvinyl-type poly(sodium carboxylate), acrylate copolymers containing hydroxyl or carbonyl groups which are susceptible to the enzymatic reaction, were prepared. It is presumed that the copolymer is first cleaved at a hydroxyl or carbonyl group as in the case of PVA, then the resultant acrylate oligomer is further assimilated by the microbes. The biodegradation of oligomeric acrylic acid (11), in fact, occurs as shown in Table I. 

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