Photodegradation kinetics of poly(para-substituted styrene) in solution |
| |
Authors: | Khalid E Al Ani Afrah E Ramadhan |
| |
Institution: | a Department of Chemistry, Faculty of Science, Hashemite University, Zarka, Jordan b Department of Industrial Chemistry, Institute of Technology, Baghdad, Iraq |
| |
Abstract: | The UV irradiation effects on stability of polystyrene, poly(4-methoxystyrene), poly(4-methylstyrene), poly(α-methylstyrene), poly(4-tert-butylstyrene), poly(4-chlorostyrene), and poly(4-bromostyrene) in dichloromethane, dichloromethane, tetrahydrofuran, and N,N-dimethylformamide solutions were studied in the presence of oxygen at different intervals of irradiation time. The photodegradation was studied at 293 K using fluorescence spectroscopy. Solutions of these polymers were accompanied by quenching of monomer and excimer emissions during the exposure of their solutions to UV light, and by a change in the structure of the fluorescence spectrum. Irradiation of poly(4-methylstyrene) and poly(α-methylstyrene) at excitation wavelength of 265 nm showed an increase of fluorescence intensity of a broad band, at longer wavelength without clear maxima. This may indicate that photodestruction of these polymers by irradiation with light of frequency absorbed by the polymer, may start from a random chain scission, with the possibility of formation of polyene and carbonyl compounds. |
| |
Keywords: | Excimer fluorescence Monomer fluorescence Poly(p-substituted styrene) Photodegradation kinetics Solvent effect |
本文献已被 ScienceDirect 等数据库收录! |
|