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Updated: Jun 12, 2025

Preparation and Testing of Plant Seed Meal-based Wood Adhesives
Published on: March 5, 2015
Crosslinking reactions of a model aminated lignin compound as a platform for building thermosetting polymers for
Saman Ghahri1, Eko Setio Wibowo1, Byung-Dae Park1
1Department of Wood and Paper Science, Kyungpook National University, Daegu 41566, Republic of Korea.
Abstract:
As millions of tons of kraft lignin are being wasted, a potential application is to use its crosslinking reactions to build thermosetting bio adhesives. However, the crosslinking reactions between lignin molecules are not fully understood. The present study aims to elucidate the crosslinking reactions of the model lignin compound guaiacylglycerol-β-guaiacyl ether (GGE) via one-step hydroxymethylation/ amination with formaldehyde and diethylenetriamine (DETAM), or one-step glyoxylation/ amination with glyoxal and DETAM via liquid NMR techniques such as 1H NMR, 13C NMR, 2D 1H-13C, and 1H-15N HSQC NMR. Specifically, the 2D 1H-13C HSQC NMR spectra confirm the presence of -CH2-NH- with a chemical shift of 1H 2.6-3.6/13C 40-60 ppm, and the formation of methylene linkages via the crosslinking reaction. Also, the 2D 1H-15N HSQC NMR spectra clearly detect the formation of amide and imine bonds at 1H 7.8/15N 110 and 1H 8.07/15N 121.5 ppm from the crosslinked GGE.
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