Rhéologie des tannins polyflavanoïdes industriels et des adhésifs tannin-aldéhyde

Abstract : Commercial mimosa, quebracho, pine and pecan polyflavonoid tannin extracts water solutions of various concentrations were examined by rheometry, measuring dynamic moduli as a function of strain amplitude and frequency. Gelling and hardening reactions of tannin extracts with formaldehyde were studied by rheometry. Methods to determine rheological characteristics of tannin-formaldehyde polycondensation reactions before and after gel point were developed. Effect of temperature, influence of hardener concentration and tannin nature on gel point, activation energy, degree of conversion and kinetic were investigated. TTT and CHT curing diagrams of tannin-based adhesives were built for various pH and formaldehyde concentrations, using thermomechanical analysis to follow the hardening of the resin in-situ a wood joint. Regression equations relating the internal bond strength of a particleboard with the inverse of the minimum deflection measured by TMA during cure of a wood joint were obtained.
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Sandrine Garnier. Rhéologie des tannins polyflavanoïdes industriels et des adhésifs tannin-aldéhyde. Autre. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10028⟩. ⟨tel-01754441⟩

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