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Ph otoclegradatio n of poly (exo-galactosene-co-styrene) in solution and solid state | ||
| Journal of College of Education | ||
| Article 1, Volume 0, Issue 6, 2017, Pages 232-246 | ||
| Authors | ||
| Yousif Ali Al-Fattahi; Salah M. Alilvi; ; Hammecl H | ||
| Abstract | ||
| The photoclegraclation oI poly (exo-galactosene-co-styrene) copolymer in clichloromethane and in benzene solution rvas stucliecl using dibenzoyl proxide as photosensitizer. It rvas observed that higher photodegradation rate of the copolymer in dichloromcthane comparecl rvith benzeue solution. Dccreases in relative arrd specitic viscosity rvere also observed in the irradiated triol1,'mcrs rvhere thc viscosity decreased in the prcscnce of dibenzoyl peroxide and benzophc'notrc phtltoscnsitizers ' antl also lritlt increasecl concentration oIdibenzoyl peroxidc with irracliation time ' The photodegradation of poly (exo-galactosene-co-styrcne)) rvas investigated in solid state using u.v.-radiation at tr:313 nm . The photodegradation rate is follow'ed by U.V. using either: I . c6polymer with difl'erent molar ratios of styrene : vinyl sugar : styrene (copolymer I) (l mole : I mole) and (copolymer II) (l mole: 3 mole) 2. Different photosensitizers (dibenzoyl peroxide and benzophenone) 9mL). 3. Ditferent concenrrarions of dibenzoyl peioxide (0.003 and 0.01 g/ml). The copolymers showed a change in U.V. absorption spectra, rvhereas the copolymer showed increased the rate of photodegraded compared rvith polystyrene . The rate of photodegradation of copolymer increases with benzophenone (BPH) and dibenzoyl peroxide (DBP) as photosensitizers, but the increase in the rate of photodegradation is higher rvith benzophenone (BPH) , also the rate of photodegradation is increased rvith increasing the concentration of dibenzoyl peroxide (DBP) photosensitizer . It was tbulcl that the rate of photodegradation of poly (exo-galactosene-co-styrene) in solutiou is higher than in polymer fitms .'[he aim of this rvork is study the photodegradation of poli, (exo-galactosene-co-styrene) in solution and comparcd it rvith photodegradation in solid state by UV.- Vis. sPectra ' | ||
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