Photodegradation and Biodegradation of Poly(exo-Galactosene-co-styrene) and Poly (Exo-Galactosene-Co-Acrylonitrile

	Photodegradation and Biodegradation of Poly(exo-Galactosene-co-styrene) and Poly (Exo-Galactosene-Co-Acrylonitrile
Al-Mustansiriyah Journal of Science
Article 1, Volume 21, Issue 5, 2010, Pages 278-290
Abstract
The photodegradation of poly (exo-galactosene-co-styrene) copolymer in dichloromethane and in benzene solution was studied using dibenzoyl proxide as photosensitizer. It was observed that higher photodegradation rate of the copolymer in dichloromethane compared with benzene solution. Decreases in relative and specific viscosity were also observed in the irradiated polymers where the viscosity decreased in the presence of dibenzoyl peroxide and benzophenone photosensitizers , and also with increased concentration of dibenzoyl peroxide with irradiation time . The photodegradation of poly (exo-galactosene-co-styrene) and poly (exo-galactosene-co-acrelonitrile) was investigated in solid state using u.v.-radiation at λ = 313 nm . The photodegradation rate is followed by U.V. and I.R spectrophotometry using dibenzoyl peroxide (0.003 g/mL). The copolymers showed a change in their I.R and U.V. absorption spectra, especially at the carbonyl absorption region. Upon photoirradiation, the I.R spectra showed that the absorbance ratios Aco/A1600 have increased with irradiation period, whereas the copolymer showed the most rapid increase in carbonyl group absorbance. The rate of photodegradation of poly (exo-galactosene-co-styrene) is higher than the rate of photodegradation of poly (exo-galactosene-co-acrylonitrile) in solid state which was explained by the higher light absorption at the irradiated wavelength (313 nm). The biodegradability of photodegradable polymers has been also studied using isolated bacteria from crude oil (Pseudomonas aeuroginosaRB-19).This type of bacteria is known to be capable of utilizing the degraded copolymers

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