Studies into the Early Degradation Stages of Cellulose by Different Iron Gall Ink Components |
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Authors: | Ute Henniges Gerhard Banik Rebecca Reibke Antje Potthast |
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Institution: | 1. Department of Chemistry, University of Natural Resources and Applied Life Sciences (BOKU), Muthgasse 18, A-1190 Wien, Austria;2. Staatliche Akademie der Bildenden Künste Stuttgart, Höhenstraße 16, D-70736 Fellbach, Germany;3. Universitätsbibliothek Marburg, Wilhelm-Röpke- Str.4, D-35039 Marburg, Germany |
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Abstract: | Selective fluorescence labelling of oxidized cellulose functionalities followed by GPC-MALLS was used to get a deeper insight into ink-induced degradation processes. As the method is very sensitive towards oxidation and molecular weight changes, slight variations at the very beginning of aging processes, e.g. during ink corrosion of cellulose, can be studied. Five different ink modifications were applied on model papers and underwent mild accelerated aging at 55 °C and cycling humidity (7 days) followed by a short period of static humid aging at 80 °C (2 days). Pure ink constituents like tannic acid or iron sulphate do not result in the same degree of oxidation or chain scission as complete inks. Balanced ink degrades paper more than single compounds, but less than unbalanced inks. Interestingly, some degradation occurs already during or shortly after the application process of unbalanced inks on paper. It could be demonstrated that this oxidation proceeded in a rather high Mw area, while the subsequent aging steps affected predominantly regions of shorter cellulose chains. |
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Keywords: | carbonyl and carboxyl groups cellulose degradation fluorescence gel permeation chromatography ink corrosion molecular weight oxidation transition metal chemistry |
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