Preparation of Polyurethane Adhesives from Crude and Purified Liquefied Wood Sawdust. Jiang, W., Hosseinpourpia, R., Biziks, V., Ahmed, S. A., Militz, H., & Adamopoulos, S. Polymers, 13(19):3267, January, 2021. Number: 19 Publisher: Multidisciplinary Digital Publishing Institute![Preparation of Polyurethane Adhesives from Crude and Purified Liquefied Wood Sawdust [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Polyurethane (PU) adhesives were prepared with bio-polyols obtained via acid-catalyzed polyhydric alcohol liquefaction of wood sawdust and polymeric diphenylmethane diisocyanate (pMDI). Two polyols, i.e., crude and purified liquefied wood (CLW and PLW), were obtained from the liquefaction process with a high yield of 99.7%. PU adhesives, namely CLWPU and PLWPU, were then prepared by reaction of CLW or PLW with pMDI at various isocyanate to hydroxyl group (NCO:OH) molar ratios of 0.5:1, 1:1, 1.5:1, and 2:1. The chemical structure and thermal behavior of the bio-polyols and the cured PU adhesives were analyzed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Performance of the adhesives was evaluated by single-lap joint shear tests according to EN 302-1:2003, and by adhesive penetration. The highest shear strength was found at the NCO:OH molar ratio of 1.5:1 as 4.82 ± 1.01 N/mm2 and 4.80 ± 0.49 N/mm2 for CLWPU and PLWPU, respectively. The chemical structure and thermal properties of the cured CLWPLW and PLWPU adhesives were considerably influenced by the NCO:OH molar ratio.
@article{jiang_preparation_2021,
title = {Preparation of {Polyurethane} {Adhesives} from {Crude} and {Purified} {Liquefied} {Wood} {Sawdust}},
volume = {13},
copyright = {http://creativecommons.org/licenses/by/3.0/},
url = {https://www.mdpi.com/2073-4360/13/19/3267},
doi = {10.3390/polym13193267},
abstract = {Polyurethane (PU) adhesives were prepared with bio-polyols obtained via acid-catalyzed polyhydric alcohol liquefaction of wood sawdust and polymeric diphenylmethane diisocyanate (pMDI). Two polyols, i.e., crude and purified liquefied wood (CLW and PLW), were obtained from the liquefaction process with a high yield of 99.7\%. PU adhesives, namely CLWPU and PLWPU, were then prepared by reaction of CLW or PLW with pMDI at various isocyanate to hydroxyl group (NCO:OH) molar ratios of 0.5:1, 1:1, 1.5:1, and 2:1. The chemical structure and thermal behavior of the bio-polyols and the cured PU adhesives were analyzed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Performance of the adhesives was evaluated by single-lap joint shear tests according to EN 302-1:2003, and by adhesive penetration. The highest shear strength was found at the NCO:OH molar ratio of 1.5:1 as 4.82 ± 1.01 N/mm2 and 4.80 ± 0.49 N/mm2 for CLWPU and PLWPU, respectively. The chemical structure and thermal properties of the cured CLWPLW and PLWPU adhesives were considerably influenced by the NCO:OH molar ratio.},
language = {en},
number = {19},
urldate = {2021-09-27},
journal = {Polymers},
author = {Jiang, Wen and Hosseinpourpia, Reza and Biziks, Vladimirs and Ahmed, Sheikh Ali and Militz, Holger and Adamopoulos, Stergios},
month = jan,
year = {2021},
note = {Number: 19
Publisher: Multidisciplinary Digital Publishing Institute},
keywords = {FTIR, bond strength, liquefaction, TGA, adhesive penetration, bio-polyol, ethylene glycol, pMDI},
pages = {3267},
file = {Full Text PDF:C\:\\Users\\Eva\\Zotero\\storage\\TS57GW79\\Jiang et al. - 2021 - Preparation of Polyurethane Adhesives from Crude a.pdf:application/pdf;Snapshot:C\:\\Users\\Eva\\Zotero\\storage\\46N352NI\\3267.html:text/html},
}
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PU adhesives, namely CLWPU and PLWPU, were then prepared by reaction of CLW or PLW with pMDI at various isocyanate to hydroxyl group (NCO:OH) molar ratios of 0.5:1, 1:1, 1.5:1, and 2:1. The chemical structure and thermal behavior of the bio-polyols and the cured PU adhesives were analyzed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Performance of the adhesives was evaluated by single-lap joint shear tests according to EN 302-1:2003, and by adhesive penetration. The highest shear strength was found at the NCO:OH molar ratio of 1.5:1 as 4.82 ± 1.01 N/mm2 and 4.80 ± 0.49 N/mm2 for CLWPU and PLWPU, respectively. 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