Lei H.,South West Forestry College |
Lei H.,Nanjing Forestry University |
Lei H.,University of Lorraine |
Du G.,South West Forestry College |
And 3 more authors.
Journal of Adhesion Science and Technology | Year: 2010
The addition of small percentages of Na+-montmorillonite (NaMMT) nanoclay does not appear to improve much the performance of thermosetting phenol-formaldehyde (PF) and phenol-urea-formaldehyde (PUF) resins used as adhesives for plywood and for wood particleboard. X-ray diffraction (XRD) studies indicated that NaMMT does not become completely exfoliated when mixed in small proportions to PF resins, contrary to that observed for acid-setting urea-formaldehyde (UF) resins. Differential scanning calorimetry (DSC) indicated that NaMMT has no accelerating effect on the curing of alkaline PF resins, contrary to that observed for UF resins. © 2010 Koninklijke Brill NV, Leiden.
Zhou X.,University of Lorraine |
Zhou X.,South West Forestry College |
Pizzi A.,University of Lorraine |
Du G.,South West Forestry College
Journal of Adhesion Science and Technology | Year: 2012
In this work it has been shown that the addition of small percentages of Na+-montmorillonite (Na-MMT) and organic modified-montmorillonite (O-MMT) nanoclay to thermosetting melamine-urea-formaldehyde (MUF) resins appeared to improve, considerably, their performance as adhesives for wood particleboard. X-ray diffraction (XRD) studies indicated that Na-MMT when mixed in small proportions, loses the periodic atomic structure during the curing of MUF resins. This can be interpreted as becoming exfoliated under such conditions. Thermomechanical analysis (TMA) on laboratory MUF-bonded particleboard indicated that small percentages of Na-MMT and O-MMT improved the internal bond strength imparted by the MUF adhesive to the panel, when tested dry and also, more importantly, when tested after 2 h of boiling. The increase in water resistance of the MUF-bonded panel was particularly noticeable. Furthermore, the addition of Na-MMT was shown to increase considerably the resistance of the MUF resin to abrasion. This is important from a wood surface finish point of view. © 2012 Copyright Taylor and Francis Group, LLC.