caa a22 4500 378863533 CHVBK 20180305123352.0 cr unu---uuuuu 161128e200303 xx s 000 0 eng 10.1515/REST.2003.36 doi (NATIONALLICENCE)gruyter-10.1515/REST.2003.36 Catastrophic Room Temperature Degradation of Cotton Cellulose [Elektronische Daten] [A. Barański, A. Konieczna-Molenda, J. M. Łagan, L. M. Proniewicz] Dégradation considérable de la cellulose à température ambiante Slow cellulose degradation at room temperature requires the application of accelerated ageing tests. After an ageing treatment, the paper samples were usually stored at standard room temperature, before being used for further studies. It was assumed previously that degradation was again very slow during the post-ageing storage. However, repeated DP measurements (6 and 18-20 months after the accelerated ageing) revealed a significant decrease in the polimerization degree, as measured viscometrically, for one of the tested papers (PAPER 2). Putting the aged paper in polyethylene bags prevented, or at least slowed down, the degradation process. During the accelerated ageing and storage-ageing, the pH of the paper decreased, as shown by the contact electrode measurements. Some conclusions, concerning the storage-degradation mechanism, have been drawn. This degradation was not a result of acid hydrolysis. It is very likely determined by an oxidation process leading to the formation of carboxylic groups. Chemical centres involved in the storage-degradation are formed during the accelerated ageing. Some of them are also destroyed later on, during the ageing. The nature of these centres remains unknown. After accelerated ageing, cotton cellulose degradation at room temperature is so fast (0.5 DP units per day) that the effect cannot be ignored. Any characterization of paper samples should be done as soon as possible after the thermal treatment. If this is impossible, the time lapse between the end of accelerated ageing and the date of a measurement should be recorded.   © 2003 K. G. Saur Verlag GmbH, Ortlerstr. 8, D-81373 München Barański A. Jagiellonian University, Faculty of Chemistry and Regional Laboratory for Physicochemical Analyses and Structural Research, Ingardena 3, 30-060 Cracow, Poland, +48 12 6336377, ext. 2220. E-mail: baranski@chemia.uj.edu.pl aut Konieczna-Molenda A. Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Cracow, Poland, +48 12 6336377, ext. 2917. E-mail: konieczn@chemia.uj.edu.pl aut Łagan J. M. Jagiellonian University, Regional Laboratory for Physicochemical Analyses and Structural Research, Ingardena 3, 30-060 Cracow, Poland, +48 12 6336377, ext. 2918. E-mail: lagan@chemia.uj.edu.pl aut Proniewicz L. M. Jagiellonian University, Faculty of Chemistry and Regional Laboratory for Physicochemical Analyses and Structural Research, Ingardena 3, 30-060 Cracow, Poland, +48 12 6336377, ext. 2253. E-mail: proniewi@chemia.uj.edu.pl aut Restaurator Walter de Gruyter GmbH & Co. KG 24/1(2003-03), 36-45 0034-5806 24:1<36 2003 24 REST https://doi.org/10.1515/REST.2003.36 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/REST.2003.36 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Barański A. Jagiellonian University, Faculty of Chemistry and Regional Laboratory for Physicochemical Analyses and Structural Research, Ingardena 3, 30-060 Cracow, Poland, +48 12 6336377, ext. 2220. E-mail: baranski@chemia.uj.edu.pl aut NATIONALLICENCE 700 1- Konieczna-Molenda A. Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Cracow, Poland, +48 12 6336377, ext. 2917. E-mail: konieczn@chemia.uj.edu.pl aut NATIONALLICENCE 700 1- Łagan J. M. Jagiellonian University, Regional Laboratory for Physicochemical Analyses and Structural Research, Ingardena 3, 30-060 Cracow, Poland, +48 12 6336377, ext. 2918. E-mail: lagan@chemia.uj.edu.pl aut NATIONALLICENCE 700 1- Proniewicz L. M. Jagiellonian University, Faculty of Chemistry and Regional Laboratory for Physicochemical Analyses and Structural Research, Ingardena 3, 30-060 Cracow, Poland, +48 12 6336377, ext. 2253. E-mail: proniewi@chemia.uj.edu.pl aut NATIONALLICENCE 773 0- Restaurator Walter de Gruyter GmbH & Co. KG 24/1(2003-03), 36-45 0034-5806 24:1<36 2003 24 REST CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter