Comparison of the Hydrogen Bonding Systems inWood and Paper

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UDС

547

DOI:

DOI: 10.17238/issn0536-1036.2016.1.147

Abstract

A comparison of hydrogen bonding systems (H-bonds) in the high-quality paper and in the samples of softwood (spruce ripe and sapwood) and hardwood (sapwood of basswood) was performed by Fourier transform infrared spectroscopy methods. The interval of the studied frequencies 3000…3700 cm-1 was limited to an absorption region by hydroxyl (OH)-groups as their frequencies were the most sensitive to the occurrence of H-bonds. A distinctive fea-ture of this study was that all measurements were performed on the saw cuts of natural wood. Reducing of transmission away from the absorption bands was associated with the scattering of radiation on the natural heterogeneity of wood material. The scattering due to the high quality of the saw cuts was not enough to prevent the detailed study of the absorp-tion spectra. To estimate the H-bonds parameters the deconvolution of the absorption bands of OH-groups by Gaussian components was performed. For proper selection of the absorp-tion by hydroxyl groups initially the entire fragment, comprising the absorption bands by the methylene and hydroxyl groups, was subjected to deconvolution. Subsequently, only the parameters of deconvolution circuits, relating to the hydroxyl groups, were analyzed. It was assumed that each component of deconvolution could be associated with a certain type of H-bonds. We determined the frequency shift of the component of deconvolution with respect to the proper resonance frequency of the isolated hydroxyl group not covered for this reason by H-bond. To determine the energy of hydrogen bonds we used the literature data on the energy correlation of H-bond with the frequency shift. The relative density of hydrogen bonds was assessed in relation to the squares of deconvolution circuits. It was found that the energies of hydrogen bonds of all studied samples for all types of H-bonds were the same or very close to each other, but were different in their density. The distributions of the connec-tion densities on the energies in the capacitor paper and spruce ripe matched most closely. The densities of the strongest intermolecular hydrogen bonds in the hardwood differed from their energy in softwood. The quantities evaluation of hydrogen bonds allows us to distin-guish between glucose hydroxyl groups and adsorbed water.

Authors

E.I. Ivanova1, Candidate of Physical and Mathematical Sciences, Associate Professor S.M. Gerasyuta1, Doctor of Physical and Mathematical Sciences, Professor V.I. Ivanov-Omskiy2, Doctor of Physical and Mathematical Sciences, Professor

Affiliation

1Saint Petersburg State Forest Technical University under name of S.M. Kirov, Institutskiy per., 5, Saint Petersburg, 194021, Russian Federation; e-mail: elen.ivom@gmail.com2Ioffe Physical Technical Institute, Polytechnicheskaya st., 26, Saint Petersburg, 194021, Russian Federation; е-mail: ivanov.ivom@mail.ioffe.ru

Keywords

Fourier transform infrared spectroscopy, hydrogen bond, spruce, basswood, paper.

References

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Received on May 21, 2015