Assessing the Risks of Alkaline Damage During Deacidification Treatments of Oxidized Paper
| Autor: | Theresa Smith, Hannah R. Morris, Paul M. Whitmore, Catherine H. Stephens |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Journal of the American Institute for Conservation. 48:235-249 |
| ISSN: | 1945-2330 0197-1360 |
| DOI: | 10.1179/019713612804514251 |
| Popis: | The sensitivity of oxidized cellulose to damaging beta-elimination reactions was studied to define safe pH conditions and treatment times beyond which damage from alkaline treatment may occur; whether damage caused by alkaline treatment was affected by the type or amount of oxidation was also investigated. Cotton paper was oxidized using UV-A radiation, a hydrogen peroxide solution, or a sodium metaperiodate solution. Following oxidation, samples were soaked at room temperature in carbon-dioxide–free calcium hydroxide baths, at pH 8.5, 10.0, or 12.5, for 20 or 60 minutes. Changes to the molecular weight of the cellulose as a function of the amount of oxidation, treatment bath pH, and treatment time, were monitored to understand which conditions cause degradation to occur. The UV-A and hydrogen peroxide oxidized samples, simulating naturally oxidized papers, showed minimal sensitivity to beta-elimination reactions in baths up to pH 10.0; slight degradation was observed during treatment at pH 12.5. ... |
| Databáze: | OpenAIRE |
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