Photo Degradation of Poly Styrene and Poly (exo-Galactosene-co-Styrene

Ali Al-Fattahi, Yousif

	Photo Degradation of Poly Styrene and Poly (exo-Galactosene-co-Styrene
Al-Mustansiriyah Journal of Science
Article 1, Volume 21, Issue 5, 2010, Pages 251-264
Author
Yousif Ali Al-Fattahi
Abstract
The photodegradation of poly (exo-galactosene-co-styrene) was investigated in solid state using u.v.-radiation at λ = 313 nm and compared with polystyrene . The photodegradation rate is followed by U.V. and I.R spectrophotometry using either: 1. copolymer with different molar ratios of styrene : vinyl sugar : styrene (copolymer I) (1 mole : 1 mole) and (copolymer II) (1 mole : 3 mole) 2. Different photosensitizers (dibenzoyl peroxide and benzophenone) (0.003 g/mL). 3. Different concentrations of dibenzoyl peroxide (0.003 and 0.01 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 compared with polystyrene due to the sugar units which had on important role in increasing photodegradation of the copolymer. The rate of photodegradation of copolymers increases with benzophenone (BPH) and dibenzoyl peroxide (DBP) as photosensitizers, but the increase in the rate of photodegradation is higher with benzophenone (BPH) , also the rate of photodegradation is increased with increasing the concentration of dibenzoyl peroxide (DBP) photosensitizer . The aim of this work is study the effect of sugar molecule on the photodegradation of copolymer for styrene when compared with polystyrene

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