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Changes in the Infrared Absorbance and Color of Aged Cellulose Film

Published online by Cambridge University Press:  28 February 2011

Frances Whitaker Mayhew  and
Ira Block
Frances Whitaker Mayhew
Affiliation:
University of Delaware, 201 Alison Annex, Newark, DE 19808
Ira Block
Affiliation:
University of Maryland, 2100 Marie Mount Hall, College Park, MD,20742
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Abstract

The accelerated aging of unplasticized Cellophane film specimens was conducted at tempe:atures ranging from 80 to 150 °C in a dry, forced-air convection oven for various periods of time. Colorimetric evaluation showed increasing discoloration which could be partially reversed by rinsing in deionized water. The infrared spectra of samples aged within this temperature range show the same changes, dependent upon aging time. This indicates that the species formed in the films at temperatures above and below the boiling point of water are the same, and that the moisture content of the films may affect the reaction rate, but not the mechanisms. The observed data in the visible region fit the standard pseudofirst-order kinetics model and are in excellent agreement with those determined for both the color change of cotton and the UV absorbance of Cellophane under similar conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 267: Symposium J – Materials Issues in Art and Archaeology III , 1992 , 459
Copyright
Copyright © Materials Research Society 1992

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