Influence of the viscosity of UF resins on the radial and tangential penetration into poplar wood and on the shear strength of adhesive joints

Gavrilović-Grmuša, Ivana; Dunky, Manfred; Miljkovic, Jovan; Djiporovic-Momcilovic, Milanka

doi:10.1515/hf-2011-0177

Cited by 55 publications

(26 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The wettability of wood samples reduced with the increased viscosity of adhesives, consistent with the literature (Gavrilovic-Grmusa et al 2012;Monni et al 2007). Furthermore, the changes in surface tension of the three adhesives were not significant (from 66.87 mJ/m 2 to 68.23 mJ/m 2 , as shown in Table 1); therefore, the differences in contact angle were caused mainly by the change in viscosity.…”

Section: Dynamic Wettabilitysupporting

confidence: 87%

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Qin¹,

Gao²,

Zhang³

et al. 2014

BioResources

View full text Add to dashboard Cite

The surface free energy and dynamic wettability of wood are important to the performance of its adhesive bonding strength. In this work, the surface free energy of poplar wood samples machined with different processes were calculated by the OWRK (geometric mean) and vOCG (acid-base) methods, and the dynamic wettability of adhesives on wood samples was studied using the S-D wetting model. The results indicate that the contact angles of reference liquids on rotary wood samples were greater than those on planed or sawn wood, and the rotary wood samples were more hydrophobic. The effect of surface roughness on contact angle was insignificant compared with surface structure morphology. The total surface free energy was almost the same for the planed and sawn wood, as calculated by the OWRK and vOCG methods, and the surface free energy of rotary wood samples was lower than that of planed or sawn wood samples. The initial and equilibrium contact angle increased as the viscosity of adhesive increased for all the wood samples, and the contact angles of rotary wood samples were greater than those of planed or sawn wood; however, the K-value was lower. The wettability of the loose side was higher than that of the tight side. Contact angles decreased when surface free energy increased, while the K-value increased.

show abstract

Section: Dynamic Wettabilitysupporting

confidence: 87%

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Qin¹,

Gao²,

Zhang³

et al. 2014

BioResources

View full text Add to dashboard Cite

show abstract

“…This could partially be due to the higher viscosity of the ALS-FOH + m sample. Higher viscosities have previously shown to decrease the average penetration depth of adhesives, such as urea-formaldehyde [55]. However, the difference in viscosities was not large enough to fully explain the different penetration behavior.…”

Section: Resultsmentioning

confidence: 99%

Ammonium Lignosulfonate Adhesives for Particleboards with pMDI and Furfuryl Alcohol as Crosslinkers

et al. 2019

View full text Add to dashboard Cite

Tightening formaldehyde emission limits and the need for more sustainable materials have boosted research towards alternatives to urea-formaldehyde adhesives for wood-based panels. Lignin residues from biorefineries consist of a growing raw material source but lack reactivity. Two crosslinkers were tested for ammonium lignosulfonate (ALS)—bio-based furfuryl alcohol (FOH) and synthetic polymeric 4,4′-diphenylmethane diisocyanate (pMDI). The addition of mimosa tannin to ALS before crosslinking was also evaluated. The derived ALS adhesives were used for gluing 2-layered veneer samples and particleboards. Differential Scanning Calorimetry showed a reduction of curing temperature and heat for the samples with crosslinkers. Light microscopy showed that the FOH crosslinked samples had thicker bondlines and higher penetration, which occurred mainly through vessels. Tensile shear strength values of 2-layered veneer samples glued with crosslinked ALS adhesives were at the same level as the melamine reinforced urea-formaldehyde (UmF) reference. For particleboards, the FOH crosslinked samples showed a significant decrease in mechanical properties (internal bond (IB), modulus of elasticity (MOE), modulus of rupture (MOR)) and thickness swelling. For pMDI crosslinked samples, these properties increased compared to the UmF. Although the FOH crosslinked ALS samples can be classified as non-added-formaldehyde adhesives, their emissions were higher than what can be expected to be sourced from the particles.

show abstract

“…Di samping itu perekat UF dan air destilasi pada suhu yang sama memiliki viskositas sebesar 1,2 dan 0,008 poise. Keterbasahan permukaan bahan menurun seiring tingginya nilai viskositas cairan (Monni, et al, 2007;Gavrilovic-Grmusa, et al, 2012a, 2012bGavrilovic-Grmusa, et al, 2013). Berikutnya faktor lain yang berpengaruh terhadap proses pembasahan sangat kompleks, di antaranya adalah pH permukaan seperti yang dijelaskan oleh Gérardin, et al (2007).…”

Section: Keterbasahan Dinamis (Dynamic Wettability)unclassified

Untitled

Cahyono

Wahyudi

Priadi

et al. 2017

jts.

View full text Add to dashboard Cite

show abstract

Influence of the viscosity of UF resins on the radial and tangential penetration into poplar wood and on the shear strength of adhesive joints

Cited by 55 publications

References 0 publications

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Ammonium Lignosulfonate Adhesives for Particleboards with pMDI and Furfuryl Alcohol as Crosslinkers

Untitled

Contact Info

Product

Resources

About