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Studies on photoprotection and photo‐oxidation in polystyrene with various wavelength regions
Author(s) -
Liu Xiaoxuan,
Hu Kunjiu
Publication year - 1996
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199602)7:2<117::aid-pat454>3.0.co;2-n
Subject(s) - photoprotection , materials science , photochemistry , polystyrene , ultraviolet , wavelength , absorption (acoustics) , irradiation , infrared , optoelectronics , optics , chemistry , polymer , biochemistry , photosynthesis , composite material , physics , nuclear physics
The photoprotection of styrene‐2,2,6,6‐tetramethyl‐4‐piperidinyl methacrylate copolymer (PDS) as an ultraviolet absorbent and the photo‐oxidation in polystyrene (PS) film with various wavelength region irradiations have been studied. It was found that the photoprotection of PDS as the hindered amine for PS film was effective. In the full wavelength region irradiation, the Yellowness Index (YI) as the characterizing parameter was only 20%, corresponding to an exposure period as long as 80 hr. The results have proved that the photoprotection behavior of PDS was more effective a wavelength of 274 nm than of 318.5 nm, and the increment of the YI was proportional to the intensity absorbed by PS film. The infrared and ultraviolet spectra of PS film undergoing photooxidation have shown that (a) the dominant contribution to the increment of the ultraviolet characteristic absorption peak A (274 nm) of PS film belonged to the wavelength region (200–320 nm) rather than the singlet, and that (b) the infrared shifting of the wide‐peak A (274 nm) could be considered as the relative changes of the constants of carbonyl compounds with the conjugating and non‐conjugating structures from the end‐products of the photo‐oxidation process.