Accessible Requires Authentication Published by De Gruyter November 30, 2013

Complex between lignin and a Ti-based coupling agent

Jonas S. Rasmussen, Søren Barsberg and Claus Felby
From the journal Holzforschung


Durability, haptic, and optical appearance of wood are improved by coatings, which are nowadays prepared using environmentally compatible and less health-damaging materials. However, contemporary wood coatings have frequently a shortened service life compared to their traditional predecessors. New coating formulations would have a better performance if the adhesion to wood could be improved. In the present work, the chemical interaction between a titanium-based coupling agent, isopropyl triisostearoyl titanate (titanium agent, TA) and lignin has been studied by means of attenuated total reflectance-fourier transform infrared spectroscopy in combination with first principle predictions based on the density functional theory (DFT). In the infrared spectra, a new band at 1586 cm-1 was identified and the DFT predictions confirmed that the new band is because of the covalent bonds in the form of ether linkages between TA and lignin.

Corresponding author: Jonas S. Rasmussen, Faculty of Science, University of Copenhagen, Rolighedsvej 23, 1958 Frederiksberg C, Denmark, e-mail:


This work was supported by funding from the Danish National Advanced Technology Foundation.


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Received: 2013-7-4
Accepted: 2013-11-6
Published Online: 2013-11-30
Published in Print: 2014-7-1

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