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FT Raman spectroscopic investigation of cellulose acetate

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Abstract

This study reports on a new method characterizing cellulose acetates and determining the contents of acetyl groups within cellulose acetates based on FT Raman spectroscopy. Cellulose acetates exhibiting diverse degrees of substitution ascribed to acetyl groups (DSAc) were obtained after the deacetylation of highly acetylated cellulose, i.e. cellulose diacetate and cellulose triacetate (CTA), with aqueous sodium hydroxide solution or 1,6-hexamethylenediamine (HMDA). After plotting the Raman intensity ratios between the bands at 1,740 and 1,380 cm−1 against the DSAc, a calibration curve with high correlation coefficient of more than 0.99 was obtained. During the deacetylation of highly acetylated cellulose, a by-product—sodium acetate (NaOAc)—forms as the most possible salt among others. In order to determine the content of NaOAc, the mixtures of cellulose acetates and NaOAc were measured with FT Raman spectroscopy. Based on the relationship between the Raman intensity ratios as I929/I1380 and the contents of NaOAc in the mixtures, a calibration curve exhibiting high correlation coefficient of more than 0.99 was generated.

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Acknowledgments

The financial support by German Research Foundation (Deutsche Forschungsgemeinschaft, grants: FI755/4-1 and FI755/4-2, GR1290/7-1 and GR1290/7-2) and Funds of the European Union (EFRE, Europäischer Fonds für regionale Entwicklung) as well as the Free State of Saxonia is gratefully acknowledged.

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  1. Institute of Plant and Wood Chemistry, Dresden University of Technology, Pienner Str. 19, 01737, Tharandt, Germany

    Kai Zhang, Alexander Feldner & Steffen Fischer

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  1. Kai Zhang
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  2. Alexander Feldner
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  3. Steffen Fischer
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Correspondence to Kai Zhang or Steffen Fischer.

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Kai Zhang, Alexander Feldner authors contribute equally to the work.

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Zhang, K., Feldner, A. & Fischer, S. FT Raman spectroscopic investigation of cellulose acetate. Cellulose 18, 995–1003 (2011). https://doi.org/10.1007/s10570-011-9545-8

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  • DOI: https://doi.org/10.1007/s10570-011-9545-8

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