caa a22 4500 378935844 CHVBK 20180305123640.0 cr unu---uuuuu 161128e200412 xx s 000 0 eng 10.1515/REST.2004.249 doi (NATIONALLICENCE)gruyter-10.1515/REST.2004.249 Polarised ATR-FTIR Characterisation of Cellulosic Fibres in Relation to Historic Artefacts [Elektronische Daten] [Paul Garside, Paul Wyeth] Caractérisation polarisée ATR-FTIR des fibres cellulosiques en relation avec les artefacts historiques The utility of polarised attenuated-total-reflectance (ATR) FTIR spectroscopy was investigated for the identification of cellulosic fibres and characterisation of their state of degradation. Turning the polariser so that the electric vector is parallel (Epll) or perpendicular (Eprp) provides a means of assessing the orientational crystallinity of cellulose from the polarised spectra of aligned plant fibres. Analysis of the spectra can reveal both the angle of microfibrillar wind and its directionality. Here, the best fits to the data suggest: flax 7°/S-spiral; sisal 25°/Z-spiral; coir 70°/S-spiral, where the predominant twist is given for the outer cell-wall regions sampled. Polarised-ATR-FTIR also allows degradation of the amorphous component of cellulose to be highlighted, by recording spectra with the optimum alignment of fibre and polariser. Changes observed on thermal ageing of flax in air at 190 °C are consistent with oxidation of amorphous cellulose and formation of carbonyl and carboxylate moieties; the non-dichroic nature of the carbonyl band confirms that the ordered crystalline regions were not primarily involved. © 2004 K. G. Saur Verlag GmbH, Ortlerstr. 8, D-81373 München Garside Paul Textile Conservation Centre, Winchester Campus, University of Southampton, Park Avenue, Winchester, SO23 8DL, UK, Tel. +44(0) 2380 597122, Fax. +44(0) 2380 597101 aut Wyeth Paul Textile Conservation Centre, Winchester Campus, University of Southampton, Park Avenue, Winchester, SO23 8DL, UK, Tel. +44(0) 2380 597122, Fax. +44(0) 2380 597101; E-mail: pw@soton.ac.uk aut Restaurator Walter de Gruyter GmbH & Co. KG 25/4(2004-12), 249-259 0034-5806 25:4<249 2004 25 REST https://doi.org/10.1515/REST.2004.249 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/REST.2004.249 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Garside Paul Textile Conservation Centre, Winchester Campus, University of Southampton, Park Avenue, Winchester, SO23 8DL, UK, Tel. +44(0) 2380 597122, Fax. +44(0) 2380 597101 aut NATIONALLICENCE 700 1- Wyeth Paul Textile Conservation Centre, Winchester Campus, University of Southampton, Park Avenue, Winchester, SO23 8DL, UK, Tel. +44(0) 2380 597122, Fax. +44(0) 2380 597101; E-mail: pw@soton.ac.uk aut NATIONALLICENCE 773 0- Restaurator Walter de Gruyter GmbH & Co. KG 25/4(2004-12), 249-259 0034-5806 25:4<249 2004 25 REST CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence SWISSBIB 082555982 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter