Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds

Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds

Cellulose nanofibrils were prepared by mechanical fibrillation of never-dried beech pulp and bacterial cellulose. To facilitate the separation of individual fibrils, one part of the wood pulp was surface-carboxylated by a catalytic oxidation using (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) as a...

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Main Authors: Veigel, Stefan, Müller, Ulrich, Keckes, Jozef, Obersriebnig, Michael, Gindl-Altmutter, Wolfgang
Format: Online
Language:English
Published: Springer Netherlands 2011
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4579863/
id pubmed-4579863
recordtype oai_dc
spelling pubmed-45798632015-09-25 Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds Veigel, Stefan Müller, Ulrich Keckes, Jozef Obersriebnig, Michael Gindl-Altmutter, Wolfgang Article Cellulose nanofibrils were prepared by mechanical fibrillation of never-dried beech pulp and bacterial cellulose. To facilitate the separation of individual fibrils, one part of the wood pulp was surface-carboxylated by a catalytic oxidation using (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) as a catalyst. After fibrillation by a high pressure homogenizer, the obtained aqueous fibril dispersions were directly mixed with different urea–formaldehyde-(UF)-adhesives. To investigate the effect of added cellulose filler on the fracture mechanical properties of wood adhesive bonds, double cantilever beam specimens were prepared from spruce wood. While the highest fracture energy values were observed for UF-bonds filled with untreated nanofibrils prepared from wood pulp, bonds filled with TEMPO-oxidized fibrils showed less satisfying performance. It is proposed that UF-adhesive bonds can be significantly toughened by the addition of only small amounts of cellulose nanofibrils. Thereby, the optimum filler content is largely depending on the adhesive and type of cellulose filler used. Springer Netherlands 2011-07-15 2011 /pmc/articles/PMC4579863/ /pubmed/26412949 http://dx.doi.org/10.1007/s10570-011-9576-1 Text en © Springer Science+Business Media B.V. 2011
repository_type Open Access Journal
institution_category Foreign Institution
institution US National Center for Biotechnology Information
building NCBI PubMed
collection Online Access
language English
format Online
author Veigel, Stefan
Müller, Ulrich
Keckes, Jozef
Obersriebnig, Michael
Gindl-Altmutter, Wolfgang
spellingShingle Veigel, Stefan
Müller, Ulrich
Keckes, Jozef
Obersriebnig, Michael
Gindl-Altmutter, Wolfgang
Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds
author_facet Veigel, Stefan
Müller, Ulrich
Keckes, Jozef
Obersriebnig, Michael
Gindl-Altmutter, Wolfgang
author_sort Veigel, Stefan
title Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds
title_short Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds
title_full Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds
title_fullStr Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds
title_full_unstemmed Cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds
title_sort cellulose nanofibrils as filler for adhesives: effect on specific fracture energy of solid wood-adhesive bonds
description Cellulose nanofibrils were prepared by mechanical fibrillation of never-dried beech pulp and bacterial cellulose. To facilitate the separation of individual fibrils, one part of the wood pulp was surface-carboxylated by a catalytic oxidation using (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) as a catalyst. After fibrillation by a high pressure homogenizer, the obtained aqueous fibril dispersions were directly mixed with different urea–formaldehyde-(UF)-adhesives. To investigate the effect of added cellulose filler on the fracture mechanical properties of wood adhesive bonds, double cantilever beam specimens were prepared from spruce wood. While the highest fracture energy values were observed for UF-bonds filled with untreated nanofibrils prepared from wood pulp, bonds filled with TEMPO-oxidized fibrils showed less satisfying performance. It is proposed that UF-adhesive bonds can be significantly toughened by the addition of only small amounts of cellulose nanofibrils. Thereby, the optimum filler content is largely depending on the adhesive and type of cellulose filler used.
publisher Springer Netherlands
publishDate 2011
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4579863/
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