ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
The degradation of the surface composition of poly(ethylene terephthalate) (PET) film by ultraviolet light was analysed by ESCA combined with gas chemical modification (GCM) techniques. A new approach for distinguishing phenolic hydroxyl and alcoholic hydroxyl groups was presented, which uses the difference in reactivity of trifluoroacetic anhydride to the phenolic group and to the alcoholic group. The carboxyl group was detected with trifluoroethanol. The ESCA-GCM results showed differences of the chemical composition of the light-facing side and the back side of the PET film. According to photodegradation mechanisms of PET reported by other researchers, carboxyl group formation suggested cleavage of the main chain of PET. The number of the phenolic carbon on the light-facing side corresponded to the existence of 16 phenolic groups per 100 monomeric units.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
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