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Modelling the degradation of acidic and alkaline printing paper

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Abstract

There has always been an interest in the professional communities of libraries, archives and conservation science to find ways of estimating the rate of degradation of paper under archival conservation conditions. Previously we reported a number of considerations for developing a kinetic degradation model based on Whatman no.1 paper. In the present research, this model was extended to 10 different papers and validated. Various physical and chemical properties of acidic, neutral, and alkaline papers were measured, such as the degree of polymerization (DP), tensile strength, equilibrium moisture content, and pH, as well as alkaline fillers content when applicable. The activation energy (Ea) based on DP of cellulose and zero-span tensile strength were determined. Ea and pH had the most significant influence on the simulated decay of paper. Papers with a high Ea (> 120 kJ mol−1), alkaline such as those containing at least 2% CaCO3, and acidic—but good printing quality papers made of bleached chemical pulp– were found the most durable in ambient conditions. Papers with a lower Ea (< 110 kJ mol−1) such as lignocellulosic papers containing significant amount of mechanical pulp were much less stable over time. Whatman filter papers, used as models of pure cellulosic papers, were found to have low Ea despite the good quality cotton fibers. A generic isoperm equation based on Ea was developed to predict the changes in the state of papers under various climatic conditions, and was applicable independently of the pH of the paper. The model developed allows a better quantification of the deterioration rate of printing papers such as those that are currently, and will be in the future, found in our archival collections.

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Acknowledgments

The authors would like to dedicate this paper to our late friend Luc Bourbonnais. We have played with some equations together. The authors are grateful to Valérie Dupont for her insightful contribution during the editing of this article.

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The authors received no financial support for the research, authorship, and/or publication of this article.

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JT & ALD: Conceptualization, Methodology, Validation, Formal Analysis, Investigation, Resources, Writing—Original Draft, Visualization, Supervision, Project administration; DV, PB & SPL: Validation, Formal Analysis, Investigation, Resources.

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Correspondence to A.-L. Dupont.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript and that they have no relevant financial or non-financial interests to disclose.

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Tétreault, J., Vedoy, D., Bégin, P. et al. Modelling the degradation of acidic and alkaline printing paper. Cellulose 30, 11157–11175 (2023). https://doi.org/10.1007/s10570-023-05529-6

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  • DOI: https://doi.org/10.1007/s10570-023-05529-6

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