caa a22 4500 378867709 CHVBK 20180305123402.0 cr unu---uuuuu 161128e20030820xx s 000 0 eng 10.1515/HF.2003.069 doi (NATIONALLICENCE)gruyter-10.1515/HF.2003.069 The Oriented Structure of Lignin and its Viscoelastic Properties Studied by Static and Dynamic FT-IR Spectroscopy [Elektronische Daten] [M. Åkerholm, L. Salmén] In order to define the role of lignin for stress transfer in the fiber wall, its orientation and mechanical interaction with other cell-wall components were investigated. Polarized infrared spectra of oriented thermomechanical pulp fiber sheets were used to determine the molecular orientation, and dynamic infrared spectroscopy was used to study the rheology of lignin in the cell wall. The results indicate that there is a preferred orientation of the phenyl-propane units of lignin along the fiber axis in spruce tracheids. This implies there is an ordered structure of lignin in the secondary wall of tracheids analogous to that of the cell-wall polysaccharides. The dynamic IR-spectra also indicated that lignin exhibits a much more viscoelastic behavior than do the carbohydrates, a knowledge of importance in the interpretation of transverse fiber properties. Copyright © 2003 by Walter de Gruyter GmbH & Co. KG Timber & wood processing nationallicence Biotechnology nationallicence Materials science nationallicence Åkerholm M. aut Salmén L. aut Holzforschung Walter de Gruyter 57/5(2003-08-20), 459-465 0018-3830 57:5<459 2003 57 hfsg https://doi.org/10.1515/HF.2003.069 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/HF.2003.069 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Åkerholm M. aut NATIONALLICENCE 700 1- Salmén L. aut NATIONALLICENCE 773 0- Holzforschung Walter de Gruyter 57/5(2003-08-20), 459-465 0018-3830 57:5<459 2003 57 hfsg CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter