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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Magalhaes, Fd
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2020Experiment and modelling of the strain-rate-dependent response during in vitro degradation of PLA fibrescitations
- 2018Dynamic mechanical analysis and creep-recovery behavior of agglomerated corkcitations
- 2018Antimicrobial graphene nanoplatelets coatings for silicone catheterscitations
- 2014Evaluation of Bonding Performance of Amino Polymers Using ABEScitations
- 2014Physicomechanical characterization of monodisperse multivesiculated polyester particlescitations
- 2013Effect of incorporation of graphene oxide and graphene nanoplatelets on mechanical and gas permeability properties of poly(lactic acid) filmscitations
- 2013Dispersion of graphene nanoplatelets in poly(vinyl acetate) latex and effect on adhesive bond strengthcitations
- 2013Preparation and Characterization of Acrylic Polymer Nanocomposite Films Obtained from Aqueous Dispersionscitations
- 2012Synthesis and Characterization of Allyl Fatty Acid Derivatives as Reactive Coalescing Agents for Latexescitations
- 2011Evaluation of urea-formaldehyde adhesives performance by recently developed mechanical testscitations
- 2010A Study on the Colloidal Nature of Urea-Formaldehyde Resins and Its Relation with Adhesive Performancecitations
- 2006New trends on membrane science
Places of action
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article
A Study on the Colloidal Nature of Urea-Formaldehyde Resins and Its Relation with Adhesive Performance
Abstract
Urea-formaldehyde (UF) resins present a swollen colloidal phase dispersed within a continuous water phase containing soluble oligomers. The main goal of the present investigation is to clarify the physical and chemical nature of those two phases and elucidate their impact on the bonding process. Optical and electronic microscopy has provided information on the morphology of the colloidal phase, showing primary particles and particle agglomerates. Mechanisms are suggested for the colloidal stabilization and dilution-induced flocculation. Three commercial UF resins with different F/U molar ratios were studied using particle size distribution (PSD) analysis. The results showed the influence of the resin's degree of condensation and the aging status on the size of the colloidal structures. Gel permeation chromatography analysis was performed on samples of different resins and of the respective continuous and dispersed phases, separated by centrifugation. The quantified fraction of insoluble molecular aggregates present in the chromatograms was related to the resins synthesis conditions and age. Differential scanning calorimetry and tensile shear strength tests were performed to evaluate the reactivity and adhesive performance of each phase. It is suggested that the colloidal phase acts as a reactive filler at the wood joint interfaces, contributing for the resins bonding performance. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 118: 1956-1968, 2010