ISSN:
0003-3146
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The photochemical behaviour of Bisphenol-A polycarbonate (PC) under various types of monochromatic and polychromatic radiations is reported. The PC dual photochemistry observed in the solid state is characterized using both UV and FTIR spectroscopy. At short wavelength, the intrinsic photochemistry, which is associated with the direct photo-excitation of PC chromophore groups, accounts for the formation of phenylsalicylate, dihydroxybenzophenone, hydroxybiphenyl and hydroxydiphenyl ether groups. The extrinsic photochemistry of PC, related to the excitation of chromophoric defects, is easily observed at long wavelength. This photoinduced oxidation leads to the formation of tertiary hydroperoxides which decompose into alcohols and ketones. The two photochemistries kinetically overlap but their stoichiometry remains independent. PC films can be used therefore to check the relative importance of short and long wavelength radiations emitted by the various sources used in the field of polymer degradation.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/apmc.1994.052160110
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