The Experts below are selected from a list of 20364 Experts worldwide ranked by ideXlab platform
Bertrand Charrier - One of the best experts on this subject based on the ideXlab platform.
-
Corn flour-Mimosa tannin-based adhesives without formaldehyde for interior particleboard production
Wood Science and Technology, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, Antonio Pizzi, H R Mansouri, Bertrand CharrierAbstract:A formaldehyde-free adhesive consisting of a corn flour/NaOH adhesive mixture and a Mimosa tannin/hexamine intermediate component was developed and evaluated for application to wood panels such as particleboards. The main ingredients of this adhesive include corn flour, NaOH, Mimosa tannin and hexamine. This study investigated the physical properties (rheological and thermal analysis) of corn flour/NaOH and Mimosa tannin/hexamine adhesives as well as mechanical properties of particleboards produced with these adhesives. Thermomechanical (TMA) experiments indicate the best performance of the adhesives to be around the relative mass proportions of 50:50 between corn flour/NaOH and Mimosa tannin/hexamine. Former NMR measurements on corn starch and Mimosa tannin proved that the two components behave as a polymer blend rather than co-reacting. The laboratory results show that particleboards bonded with the adhesive at this optimal ratio show good mechanical properties. Moreover, the formaldehyde emission levels obtained from boards bonded with the optimal adhesive were considerably lower to those obtained from boards made with control urea formaldehyde.
-
Mechanical characterization of industrial particleboard panels glued with cornstarch-Mimosa tannin-urea formaldehyde resins
Journal of Adhesion Science and Technology, 2013Co-Authors: Amine Moubarik, Mariona Badia, Ahmed Allal, Hamidreza Mansouri, Fatima Charrier, Bertrand CharrierAbstract:The aim of this work was to validate the utility and performance of optimal laboratory cornstarch-Mimosa tannin-based resins in the industrial particleboard production. In this way, the cornstarch and Mimosa tannin was introduced in the classic adhesive formulation in order to supply a part of urea-formaldehyde (UF). Our results show that industrial particleboard panels (8.2mx1.85mx19mm) bonded with optimal cornstarch-Mimosa tannin-UF (10:4:86; mass ratio) resins exhibited comparable mechanical properties to those of boards bonded with commercial UF resins and largely satisfied the exigencies of European norms EN 312. The formaldehyde emission levels obtained from panels bonded with cornstarch-Mimosa tannin-UF were lower to those obtained from panels bonded with control UF. Finally, the addition of cornstarch and Mimosa tannin improves markedly the water resistance of UF resins.
-
Corn flour-Mimosa tannin-based adhesives without formaldehyde for interior particleboard production
Wood Science and Technology, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, Antonio Pizzi, H R Mansouri, Bertrand CharrierAbstract:A formaldehyde-free adhesive consisting of a corn flour/NaOH adhesive mixture and a Mimosa tannin/hexamine intermediate component was developed and evaluated for application to wood panels such as particleboards. The main ingredients of this adhesive include corn flour, NaOH, Mimosa tannin and hexamine. This study investigated the physical properties (rheological and thermal analysis) of corn flour/NaOH and Mimosa tannin/hexamine adhesives as well as mechanical properties of particleboards produced with these adhesives. Thermomechanical (TMA) experiments indicate the best performance of the adhesives to be around the relative mass proportions of 50:50 between corn flour/NaOH and Mimosa tannin/hexamine. Former NMR measurements on corn starch and Mimosa tannin proved that the two components behave as a polymer blend rather than co-reacting. The laboratory results show that particleboards bonded with the adhesive at this optimal ratio show good mechanical properties. Moreover, the formaldehyde emission levels obtained from boards bonded with the optimal adhesive were considerably lower to those obtained from boards made with control urea formaldehyde. © 2013 Springer-Verlag Berlin Heidelberg.
-
Polenta cornstarch-Mimosa tannin-based urea formaldehyde adhesives for interior grade particleboard
Journal of Materials and Environmental Science, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, A. Pizzi, Bertrand CharrierAbstract:This study investigated the physical properties (rheological and thermogravimetric) of adhesive mixtures of (i) polenta cornstarch, (ii) -Mimosa tannin, and (iii) -urea formaldehyde (UF) and various mechanical properties (internal bond, modulus of rupture and modulus of elasticity, surface soundness and withdrawal of screws) of laboratory particleboard made with such adhesive mixtures. It was found that the best results were given with the mass ratio of 10:4:86 for polenta cornstarch, Mimosa tannin and UF resin. Both, the polenta cornstarch and the Mimosa tannin were introduced into the UF resin in order to replace a certain proportion of the UF resin. The laboratory results showed that particleboards bonded with the optimal mixture of polenta cornstarch, Mimosa tannin and UF resin exhibited better mechanical properties than boards made from commercial UF resins. Rheological results show excellent structural stability of the mixture. The formaldehyde emission levels from the boards were lower by 18% to those obtained from boards bonded with the control UF. UF resins, hence, could be partially substituted by addition of polenta cornstarch and Mimosa tannin barks extracts.
-
Shear Refinement of Formaldehyde-Free Corn Starch and Mimosa Tannin (Acacia mearnsii) Wood Adhesives
Journal of Adhesion Science and Technology, 2011Co-Authors: Amine Moubarik, T. Poumadere, Ahmed Allal, Fatima Charrier, Antonio Pizzi, Nicolas Causse, Bertrand CharrierAbstract:The aim of this work was to reduce the viscosity of formaldehyde-free corn starch–Mimosa tannin wood adhesives, without adversely affecting the mechanical properties of the product. The reduction of viscosity was achieved using shear refinement. The study focused on the physical phenomena before cross-linking of the wood adhesive. The physical (rheological characterization) and mechanical (bond strength) properties of formaldehyde-free corn starch and Mimosa tannin wood adhesives were measured. The results showed that the shear refinement (290 rpm and 5 min, optimal conditions) reduced the viscosity of the corn starch–Mimosa tannin wood adhesives (from 100 000 to 458 Pa s) with the advantage of being stable over time. Mechanical tests showed that the shear refinement did not influence the mechanical properties of corn starch–Mimosa tannin wood adhesives.
Amine Moubarik - One of the best experts on this subject based on the ideXlab platform.
-
Corn flour-Mimosa tannin-based adhesives without formaldehyde for interior particleboard production
Wood Science and Technology, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, Antonio Pizzi, H R Mansouri, Bertrand CharrierAbstract:A formaldehyde-free adhesive consisting of a corn flour/NaOH adhesive mixture and a Mimosa tannin/hexamine intermediate component was developed and evaluated for application to wood panels such as particleboards. The main ingredients of this adhesive include corn flour, NaOH, Mimosa tannin and hexamine. This study investigated the physical properties (rheological and thermal analysis) of corn flour/NaOH and Mimosa tannin/hexamine adhesives as well as mechanical properties of particleboards produced with these adhesives. Thermomechanical (TMA) experiments indicate the best performance of the adhesives to be around the relative mass proportions of 50:50 between corn flour/NaOH and Mimosa tannin/hexamine. Former NMR measurements on corn starch and Mimosa tannin proved that the two components behave as a polymer blend rather than co-reacting. The laboratory results show that particleboards bonded with the adhesive at this optimal ratio show good mechanical properties. Moreover, the formaldehyde emission levels obtained from boards bonded with the optimal adhesive were considerably lower to those obtained from boards made with control urea formaldehyde.
-
Mechanical characterization of industrial particleboard panels glued with cornstarch-Mimosa tannin-urea formaldehyde resins
Journal of Adhesion Science and Technology, 2013Co-Authors: Amine Moubarik, Mariona Badia, Ahmed Allal, Hamidreza Mansouri, Fatima Charrier, Bertrand CharrierAbstract:The aim of this work was to validate the utility and performance of optimal laboratory cornstarch-Mimosa tannin-based resins in the industrial particleboard production. In this way, the cornstarch and Mimosa tannin was introduced in the classic adhesive formulation in order to supply a part of urea-formaldehyde (UF). Our results show that industrial particleboard panels (8.2mx1.85mx19mm) bonded with optimal cornstarch-Mimosa tannin-UF (10:4:86; mass ratio) resins exhibited comparable mechanical properties to those of boards bonded with commercial UF resins and largely satisfied the exigencies of European norms EN 312. The formaldehyde emission levels obtained from panels bonded with cornstarch-Mimosa tannin-UF were lower to those obtained from panels bonded with control UF. Finally, the addition of cornstarch and Mimosa tannin improves markedly the water resistance of UF resins.
-
Corn flour-Mimosa tannin-based adhesives without formaldehyde for interior particleboard production
Wood Science and Technology, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, Antonio Pizzi, H R Mansouri, Bertrand CharrierAbstract:A formaldehyde-free adhesive consisting of a corn flour/NaOH adhesive mixture and a Mimosa tannin/hexamine intermediate component was developed and evaluated for application to wood panels such as particleboards. The main ingredients of this adhesive include corn flour, NaOH, Mimosa tannin and hexamine. This study investigated the physical properties (rheological and thermal analysis) of corn flour/NaOH and Mimosa tannin/hexamine adhesives as well as mechanical properties of particleboards produced with these adhesives. Thermomechanical (TMA) experiments indicate the best performance of the adhesives to be around the relative mass proportions of 50:50 between corn flour/NaOH and Mimosa tannin/hexamine. Former NMR measurements on corn starch and Mimosa tannin proved that the two components behave as a polymer blend rather than co-reacting. The laboratory results show that particleboards bonded with the adhesive at this optimal ratio show good mechanical properties. Moreover, the formaldehyde emission levels obtained from boards bonded with the optimal adhesive were considerably lower to those obtained from boards made with control urea formaldehyde. © 2013 Springer-Verlag Berlin Heidelberg.
-
Polenta cornstarch-Mimosa tannin-based urea formaldehyde adhesives for interior grade particleboard
Journal of Materials and Environmental Science, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, A. Pizzi, Bertrand CharrierAbstract:This study investigated the physical properties (rheological and thermogravimetric) of adhesive mixtures of (i) polenta cornstarch, (ii) -Mimosa tannin, and (iii) -urea formaldehyde (UF) and various mechanical properties (internal bond, modulus of rupture and modulus of elasticity, surface soundness and withdrawal of screws) of laboratory particleboard made with such adhesive mixtures. It was found that the best results were given with the mass ratio of 10:4:86 for polenta cornstarch, Mimosa tannin and UF resin. Both, the polenta cornstarch and the Mimosa tannin were introduced into the UF resin in order to replace a certain proportion of the UF resin. The laboratory results showed that particleboards bonded with the optimal mixture of polenta cornstarch, Mimosa tannin and UF resin exhibited better mechanical properties than boards made from commercial UF resins. Rheological results show excellent structural stability of the mixture. The formaldehyde emission levels from the boards were lower by 18% to those obtained from boards bonded with the control UF. UF resins, hence, could be partially substituted by addition of polenta cornstarch and Mimosa tannin barks extracts.
-
Shear Refinement of Formaldehyde-Free Corn Starch and Mimosa Tannin (Acacia mearnsii) Wood Adhesives
Journal of Adhesion Science and Technology, 2011Co-Authors: Amine Moubarik, T. Poumadere, Ahmed Allal, Fatima Charrier, Antonio Pizzi, Nicolas Causse, Bertrand CharrierAbstract:The aim of this work was to reduce the viscosity of formaldehyde-free corn starch–Mimosa tannin wood adhesives, without adversely affecting the mechanical properties of the product. The reduction of viscosity was achieved using shear refinement. The study focused on the physical phenomena before cross-linking of the wood adhesive. The physical (rheological characterization) and mechanical (bond strength) properties of formaldehyde-free corn starch and Mimosa tannin wood adhesives were measured. The results showed that the shear refinement (290 rpm and 5 min, optimal conditions) reduced the viscosity of the corn starch–Mimosa tannin wood adhesives (from 100 000 to 458 Pa s) with the advantage of being stable over time. Mechanical tests showed that the shear refinement did not influence the mechanical properties of corn starch–Mimosa tannin wood adhesives.
M Malone - One of the best experts on this subject based on the ideXlab platform.
-
wound induced hydraulic signals and stimulus transmission in Mimosa pudica l
New Phytologist, 1994Co-Authors: M MaloneAbstract:summary The mechanism of wound signalling in Mimosa is discussed with a brief historical survey. It is demonstrated that strong wound-induced hydraulic signals occur in Mimosa pudica L., as in many other plants, and that the basipetal mass flows associated with these events could disperse solutes from the wound site at rates of at least 15 mm s−1 and possibly up to 300 mms−1. When such wound-induced ‘hydraulic dispersal’ is taken into account, Ricca's theory of chemical signalling can explain long-distance transmission in Mimosa. The pattern of long-distance wound signalling in Mimosa is shown to be consistent with such a model. Implications for theories of electrical signalling in Mimosa are discussed and it is concluded, in agreement with some previous workers, that systemic wound-induced electrical phenomena in Mimosa are not travelling signals, but are local responses to the travelling chemical messengers.
-
Wound‐induced hydraulic signals and stimulus transmission in Mimosa pudica L
New Phytologist, 1994Co-Authors: M MaloneAbstract:summary The mechanism of wound signalling in Mimosa is discussed with a brief historical survey. It is demonstrated that strong wound-induced hydraulic signals occur in Mimosa pudica L., as in many other plants, and that the basipetal mass flows associated with these events could disperse solutes from the wound site at rates of at least 15 mm s−1 and possibly up to 300 mms−1. When such wound-induced ‘hydraulic dispersal’ is taken into account, Ricca's theory of chemical signalling can explain long-distance transmission in Mimosa. The pattern of long-distance wound signalling in Mimosa is shown to be consistent with such a model. Implications for theories of electrical signalling in Mimosa are discussed and it is concluded, in agreement with some previous workers, that systemic wound-induced electrical phenomena in Mimosa are not travelling signals, but are local responses to the travelling chemical messengers.
Fatima Charrier - One of the best experts on this subject based on the ideXlab platform.
-
Corn flour-Mimosa tannin-based adhesives without formaldehyde for interior particleboard production
Wood Science and Technology, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, Antonio Pizzi, H R Mansouri, Bertrand CharrierAbstract:A formaldehyde-free adhesive consisting of a corn flour/NaOH adhesive mixture and a Mimosa tannin/hexamine intermediate component was developed and evaluated for application to wood panels such as particleboards. The main ingredients of this adhesive include corn flour, NaOH, Mimosa tannin and hexamine. This study investigated the physical properties (rheological and thermal analysis) of corn flour/NaOH and Mimosa tannin/hexamine adhesives as well as mechanical properties of particleboards produced with these adhesives. Thermomechanical (TMA) experiments indicate the best performance of the adhesives to be around the relative mass proportions of 50:50 between corn flour/NaOH and Mimosa tannin/hexamine. Former NMR measurements on corn starch and Mimosa tannin proved that the two components behave as a polymer blend rather than co-reacting. The laboratory results show that particleboards bonded with the adhesive at this optimal ratio show good mechanical properties. Moreover, the formaldehyde emission levels obtained from boards bonded with the optimal adhesive were considerably lower to those obtained from boards made with control urea formaldehyde.
-
Mechanical characterization of industrial particleboard panels glued with cornstarch-Mimosa tannin-urea formaldehyde resins
Journal of Adhesion Science and Technology, 2013Co-Authors: Amine Moubarik, Mariona Badia, Ahmed Allal, Hamidreza Mansouri, Fatima Charrier, Bertrand CharrierAbstract:The aim of this work was to validate the utility and performance of optimal laboratory cornstarch-Mimosa tannin-based resins in the industrial particleboard production. In this way, the cornstarch and Mimosa tannin was introduced in the classic adhesive formulation in order to supply a part of urea-formaldehyde (UF). Our results show that industrial particleboard panels (8.2mx1.85mx19mm) bonded with optimal cornstarch-Mimosa tannin-UF (10:4:86; mass ratio) resins exhibited comparable mechanical properties to those of boards bonded with commercial UF resins and largely satisfied the exigencies of European norms EN 312. The formaldehyde emission levels obtained from panels bonded with cornstarch-Mimosa tannin-UF were lower to those obtained from panels bonded with control UF. Finally, the addition of cornstarch and Mimosa tannin improves markedly the water resistance of UF resins.
-
Corn flour-Mimosa tannin-based adhesives without formaldehyde for interior particleboard production
Wood Science and Technology, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, Antonio Pizzi, H R Mansouri, Bertrand CharrierAbstract:A formaldehyde-free adhesive consisting of a corn flour/NaOH adhesive mixture and a Mimosa tannin/hexamine intermediate component was developed and evaluated for application to wood panels such as particleboards. The main ingredients of this adhesive include corn flour, NaOH, Mimosa tannin and hexamine. This study investigated the physical properties (rheological and thermal analysis) of corn flour/NaOH and Mimosa tannin/hexamine adhesives as well as mechanical properties of particleboards produced with these adhesives. Thermomechanical (TMA) experiments indicate the best performance of the adhesives to be around the relative mass proportions of 50:50 between corn flour/NaOH and Mimosa tannin/hexamine. Former NMR measurements on corn starch and Mimosa tannin proved that the two components behave as a polymer blend rather than co-reacting. The laboratory results show that particleboards bonded with the adhesive at this optimal ratio show good mechanical properties. Moreover, the formaldehyde emission levels obtained from boards bonded with the optimal adhesive were considerably lower to those obtained from boards made with control urea formaldehyde. © 2013 Springer-Verlag Berlin Heidelberg.
-
Polenta cornstarch-Mimosa tannin-based urea formaldehyde adhesives for interior grade particleboard
Journal of Materials and Environmental Science, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, A. Pizzi, Bertrand CharrierAbstract:This study investigated the physical properties (rheological and thermogravimetric) of adhesive mixtures of (i) polenta cornstarch, (ii) -Mimosa tannin, and (iii) -urea formaldehyde (UF) and various mechanical properties (internal bond, modulus of rupture and modulus of elasticity, surface soundness and withdrawal of screws) of laboratory particleboard made with such adhesive mixtures. It was found that the best results were given with the mass ratio of 10:4:86 for polenta cornstarch, Mimosa tannin and UF resin. Both, the polenta cornstarch and the Mimosa tannin were introduced into the UF resin in order to replace a certain proportion of the UF resin. The laboratory results showed that particleboards bonded with the optimal mixture of polenta cornstarch, Mimosa tannin and UF resin exhibited better mechanical properties than boards made from commercial UF resins. Rheological results show excellent structural stability of the mixture. The formaldehyde emission levels from the boards were lower by 18% to those obtained from boards bonded with the control UF. UF resins, hence, could be partially substituted by addition of polenta cornstarch and Mimosa tannin barks extracts.
-
Shear Refinement of Formaldehyde-Free Corn Starch and Mimosa Tannin (Acacia mearnsii) Wood Adhesives
Journal of Adhesion Science and Technology, 2011Co-Authors: Amine Moubarik, T. Poumadere, Ahmed Allal, Fatima Charrier, Antonio Pizzi, Nicolas Causse, Bertrand CharrierAbstract:The aim of this work was to reduce the viscosity of formaldehyde-free corn starch–Mimosa tannin wood adhesives, without adversely affecting the mechanical properties of the product. The reduction of viscosity was achieved using shear refinement. The study focused on the physical phenomena before cross-linking of the wood adhesive. The physical (rheological characterization) and mechanical (bond strength) properties of formaldehyde-free corn starch and Mimosa tannin wood adhesives were measured. The results showed that the shear refinement (290 rpm and 5 min, optimal conditions) reduced the viscosity of the corn starch–Mimosa tannin wood adhesives (from 100 000 to 458 Pa s) with the advantage of being stable over time. Mechanical tests showed that the shear refinement did not influence the mechanical properties of corn starch–Mimosa tannin wood adhesives.
Ahmed Allal - One of the best experts on this subject based on the ideXlab platform.
-
Corn flour-Mimosa tannin-based adhesives without formaldehyde for interior particleboard production
Wood Science and Technology, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, Antonio Pizzi, H R Mansouri, Bertrand CharrierAbstract:A formaldehyde-free adhesive consisting of a corn flour/NaOH adhesive mixture and a Mimosa tannin/hexamine intermediate component was developed and evaluated for application to wood panels such as particleboards. The main ingredients of this adhesive include corn flour, NaOH, Mimosa tannin and hexamine. This study investigated the physical properties (rheological and thermal analysis) of corn flour/NaOH and Mimosa tannin/hexamine adhesives as well as mechanical properties of particleboards produced with these adhesives. Thermomechanical (TMA) experiments indicate the best performance of the adhesives to be around the relative mass proportions of 50:50 between corn flour/NaOH and Mimosa tannin/hexamine. Former NMR measurements on corn starch and Mimosa tannin proved that the two components behave as a polymer blend rather than co-reacting. The laboratory results show that particleboards bonded with the adhesive at this optimal ratio show good mechanical properties. Moreover, the formaldehyde emission levels obtained from boards bonded with the optimal adhesive were considerably lower to those obtained from boards made with control urea formaldehyde.
-
Mechanical characterization of industrial particleboard panels glued with cornstarch-Mimosa tannin-urea formaldehyde resins
Journal of Adhesion Science and Technology, 2013Co-Authors: Amine Moubarik, Mariona Badia, Ahmed Allal, Hamidreza Mansouri, Fatima Charrier, Bertrand CharrierAbstract:The aim of this work was to validate the utility and performance of optimal laboratory cornstarch-Mimosa tannin-based resins in the industrial particleboard production. In this way, the cornstarch and Mimosa tannin was introduced in the classic adhesive formulation in order to supply a part of urea-formaldehyde (UF). Our results show that industrial particleboard panels (8.2mx1.85mx19mm) bonded with optimal cornstarch-Mimosa tannin-UF (10:4:86; mass ratio) resins exhibited comparable mechanical properties to those of boards bonded with commercial UF resins and largely satisfied the exigencies of European norms EN 312. The formaldehyde emission levels obtained from panels bonded with cornstarch-Mimosa tannin-UF were lower to those obtained from panels bonded with control UF. Finally, the addition of cornstarch and Mimosa tannin improves markedly the water resistance of UF resins.
-
Corn flour-Mimosa tannin-based adhesives without formaldehyde for interior particleboard production
Wood Science and Technology, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, Antonio Pizzi, H R Mansouri, Bertrand CharrierAbstract:A formaldehyde-free adhesive consisting of a corn flour/NaOH adhesive mixture and a Mimosa tannin/hexamine intermediate component was developed and evaluated for application to wood panels such as particleboards. The main ingredients of this adhesive include corn flour, NaOH, Mimosa tannin and hexamine. This study investigated the physical properties (rheological and thermal analysis) of corn flour/NaOH and Mimosa tannin/hexamine adhesives as well as mechanical properties of particleboards produced with these adhesives. Thermomechanical (TMA) experiments indicate the best performance of the adhesives to be around the relative mass proportions of 50:50 between corn flour/NaOH and Mimosa tannin/hexamine. Former NMR measurements on corn starch and Mimosa tannin proved that the two components behave as a polymer blend rather than co-reacting. The laboratory results show that particleboards bonded with the adhesive at this optimal ratio show good mechanical properties. Moreover, the formaldehyde emission levels obtained from boards bonded with the optimal adhesive were considerably lower to those obtained from boards made with control urea formaldehyde. © 2013 Springer-Verlag Berlin Heidelberg.
-
Polenta cornstarch-Mimosa tannin-based urea formaldehyde adhesives for interior grade particleboard
Journal of Materials and Environmental Science, 2013Co-Authors: Amine Moubarik, Ahmed Allal, Fatima Charrier, A. Pizzi, Bertrand CharrierAbstract:This study investigated the physical properties (rheological and thermogravimetric) of adhesive mixtures of (i) polenta cornstarch, (ii) -Mimosa tannin, and (iii) -urea formaldehyde (UF) and various mechanical properties (internal bond, modulus of rupture and modulus of elasticity, surface soundness and withdrawal of screws) of laboratory particleboard made with such adhesive mixtures. It was found that the best results were given with the mass ratio of 10:4:86 for polenta cornstarch, Mimosa tannin and UF resin. Both, the polenta cornstarch and the Mimosa tannin were introduced into the UF resin in order to replace a certain proportion of the UF resin. The laboratory results showed that particleboards bonded with the optimal mixture of polenta cornstarch, Mimosa tannin and UF resin exhibited better mechanical properties than boards made from commercial UF resins. Rheological results show excellent structural stability of the mixture. The formaldehyde emission levels from the boards were lower by 18% to those obtained from boards bonded with the control UF. UF resins, hence, could be partially substituted by addition of polenta cornstarch and Mimosa tannin barks extracts.
-
Shear Refinement of Formaldehyde-Free Corn Starch and Mimosa Tannin (Acacia mearnsii) Wood Adhesives
Journal of Adhesion Science and Technology, 2011Co-Authors: Amine Moubarik, T. Poumadere, Ahmed Allal, Fatima Charrier, Antonio Pizzi, Nicolas Causse, Bertrand CharrierAbstract:The aim of this work was to reduce the viscosity of formaldehyde-free corn starch–Mimosa tannin wood adhesives, without adversely affecting the mechanical properties of the product. The reduction of viscosity was achieved using shear refinement. The study focused on the physical phenomena before cross-linking of the wood adhesive. The physical (rheological characterization) and mechanical (bond strength) properties of formaldehyde-free corn starch and Mimosa tannin wood adhesives were measured. The results showed that the shear refinement (290 rpm and 5 min, optimal conditions) reduced the viscosity of the corn starch–Mimosa tannin wood adhesives (from 100 000 to 458 Pa s) with the advantage of being stable over time. Mechanical tests showed that the shear refinement did not influence the mechanical properties of corn starch–Mimosa tannin wood adhesives.