Polarised ATR-FTIR characterisation of cellulosic fibres in relation to historic artefacts
Garside, Paul and Wyeth, Paul (2004) Polarised ATR-FTIR characterisation of cellulosic fibres in relation to historic artefacts. Restaurator, 25, (4), 249-259.
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Description/Abstract
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.
| Item Type: | Article |
|---|---|
| ISSN: | 0034-5806 (print) |
| Uncontrolled Keywords: | polarised infrared spectroscopy, attenuated total reflectance, cellulose, ageing, degradation |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | University Structure - Pre August 2011 > School of Art University Structure - Pre August 2011 > School of Chemistry |
| ePrint ID: | 15328 |
| Deposited On: | 04 Apr 2005 |
| Last Modified: | 01 Jun 2011 17:00 |
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- Polarised ATR-FTIR characterisation of cellulosic fibres in relation to historic artefacts. (deposited 05 Jun 2006)
- Polarised ATR-FTIR characterisation of cellulosic fibres in relation to historic artefacts. (deposited 04 Apr 2005) [Currently Displayed]
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