Effect of addition of microfibrillated cellulose to urea-formaldehyde on selected adhesive characteristics and distribution in particle board

Several studies demonstrate that the addition of microfibrillated cellulose (MFC) to urea-formaldehyde (UF) wood adhesive improves the mechanical bond strength of wood particle board. In order to elucidate potential underlying mechanisms, the distribution of unmodified UF as well as MFC-modified UF...

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Bibliographic Details
Published in:Cellulose (London) 2016-02, Vol.23 (1), p.571-580
Main Authors: Mahrdt, Eike, Pinkl, Stefan, Schmidberger, Clemens, van Herwijnen, Hendrikus W. G., Veigel, Stefan, Gindl-Altmutter, Wolfgang
Format: Article
Language:English
Subjects:
Adhesive bonding
Adhesives
Bioorganic Chemistry
Bond strength
Bonding strength
Cellulose
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Formaldehyde
Glass
Mechanical properties
Natural Materials
Organic Chemistry
Original Paper
Particle board
Particle size distribution
Physical Chemistry
Polymer Sciences
Shear thinning (liquids)
Sustainable Development
Urea formaldehyde resins
Viscosity
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Summary:Several studies demonstrate that the addition of microfibrillated cellulose (MFC) to urea-formaldehyde (UF) wood adhesive improves the mechanical bond strength of wood particle board. In order to elucidate potential underlying mechanisms, the distribution of unmodified UF as well as MFC-modified UF (UF-MFC) in particle board was studied by means of light microscopy. The viscosity and cure characteristic of the adhesive systems were also characterised. UF-MFC showed high viscosity and shear thinning compared to UF. Both chemical and mechanical cure of adhesive were delayed in the presence of MFC. In UF-MFC, the size distribution of adhesive particles shifts towards larger particles compared to UF. More adhesive is directly available for adhesive bonding, and a larger part of the wood is covered with adhesive. This may be the cause for the better mechanical performance of particle board bonded with UF-MFC compared to UF.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-015-0818-5