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Holzforschung

International Journal of the Biology, Chemistry, Physics, and Technology of Wood

Editor-in-Chief: Faix, Oskar

Editorial Board Member: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Salmen, Lennart / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Berry, Richard / Burgert, Ingo / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gellerstedt, Göran / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Heitner, Cyril / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Kleen, Marjatta / Koch, Gerald / Lachenal, Dominique / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Pizzi, Antonio / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Schwanninger, Manfred / Sipilä, Jussi / Tamminen, Tarja / Viikari, Liisa / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

8 Issues per year

IMPACT FACTOR 2013: 2.339
Rank 8 out of 64 in category Forestry and 2 out of 21 in category Materials Science, Paper & Wood in the 2013 Thomson Reuters Journal Citation Report/Science Edition

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The Bremen Cog of 1380 – An electron microscopic study of its degraded wood before and after stabilization with PEG

P. Hoffmann / A. Singh / Y.S. Kim / S.G. Wi / I.-J. Kim / U. Schmitt

Citation Information: Holzforschung. Volume 58, Issue 3, Pages 211–218, ISSN (Print) 0018-3830, DOI: 10.1515/HF.2004.033, June 2005

Publication History

Published Online:
2005-06-01

Abstract

The Bremen Cog is a big ship built AD 1380 from oak wood. After its recovery from the river Weser, the water-logged ship's timbers were successfully stabilized using a novel two-step polyethylene glycol (PEG) treatment. An electron microscopic study of the patterns of degradation and of the distribution of PEG within the Cog wood is described. Descriptions like these do not exist for many well known archaeological objects. SEM revealed that in areas with extensive degradation, wood cell walls are thinned and cells have a distorted appearance. TEM provided evidence that the wood has been degraded primarily by erosion bacteria. The stabilization treatment involved impregnation first with PEG 200 and then with PEG 3000. The SEM observations of PEG-impregnated wood revealed that in degraded tissues all cell types are well filled with PEG 3000. Non-degraded tissues are impermeable to PEG 3000 and are impregnated only with PEG 200. SEM confirmed earlier fluorescence microscopic evidence, that PEG 200 is absorbed by the cell walls.

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