Abstract
Degradation of cellulose under alkaline conditions is involved either involuntarily or deliberately in many different cellulose processing steps, such as pulping, bleaching, or aging within the viscose process, and the underlying chemistry has been the topic of numerous studies. When it comes to aging under alkaline conditions—either natural or accelerated (artificial)—the degradation processes are by far less investigated and understood. A prominent example of moderately alkaline cellulosic material is deacidified book paper from libraries which had undergone a mass-deacidification treatment. We studied their aging behavior under accelerated conditions in comparison to non-deacidified duplicates in order to better understand how the alkaline reserve, which was introduced by the deacidification treatment, affects the stability of the books on the long run. GPC analysis of cellulose and determination of carbonyl functionalities were performed, which were critical parameters to achieve a deeper insight into hydrolytic and oxidative changes of cellulose structure upon deacidification treatment and subsequent aging. Also, model book papers impregnated with different amounts of alkaline reserve were used to support the findings from the original book samples. Hydrolytic degradation rates of the original book papers were significantly reduced after mass deacidification compared to the non-deacidified duplicates. The beneficial effect of mass deacidification on cellulose stability was found to be strongly related to the amount of alkaline reserve deposited, independent of varying parameters of book papers. Although some indication of alkali-induced β-elimination was found (a minor decrease of the along-chain carbonyl content in the original deacidified book papers during aging), it did not occur to an extent that significantly influenced the molar mass of cellulose. The beneficial effect of retarded hydrolytic degradation by mass deacidification thus clearly outweighed possible negative alkalinity effects of the deposited alkaline reserve.
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Acknowledgments
We appreciate the support of project partners at the German National Library, Leipzig, and the Berlin State Library providing book samples. We thank Prof. G. Banik, Dr. U. Henniges at University of Natural Resources and Life Sciences, Vienna, Dr. F. Schmidt (German National Library), and Dr. A. Blüher (Swiss National Library) for fruitful discussions and literature. We appreciate the help of Dipl.Rest. E. Hummert and Dr. A. Pataki-Hundt from ABK Stuttgart and Prof. A.Vendl from the University of Applied Arts, Vienna, for aging samples. The financial support of KUR (Kulturstiftung des Bundes und der Länder, Germany), the German National Library, the Berlin State Library and the Christian-Doppler-Society, Vienna, Austria, is gratefully acknowledged.
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Ahn, K., Rosenau, T. & Potthast, A. The influence of alkaline reserve on the aging behavior of book papers. Cellulose 20, 1989–2001 (2013). https://doi.org/10.1007/s10570-013-9978-3
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DOI: https://doi.org/10.1007/s10570-013-9978-3