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Studies into the Early Degradation Stages of Cellulose by Different Iron Gall Ink Components
Author(s) -
Henniges Ute,
Banik Gerhard,
Reibke Rebecca,
Potthast Antje
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200850215
Subject(s) - cellulose , degradation (telecommunications) , humidity , accelerated aging , chemical engineering , chemistry , materials science , tannic acid , polymer chemistry , organic chemistry , composite material , telecommunications , physics , computer science , engineering , thermodynamics
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.