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- W2022366772 abstract "L'analyse enthalpique différentielle (AED) et l'analyse thermogravimétrique ont été utilisées pour caractériser divers types de lignines pures, la résine phénol-formaldéhyde (PF) pure ainsi que les mélanges lignine-phénol-formaldéhyde (LPF) avec des taux de substitution de la PF de 20, 30 et 40% par la lignine. Ces analyses ont permis de comparer la stabilité thermique des différentes lignines et de caractériser la réaction de polymérisation des mélanges LPF. Les propriétés thermiques obtenues par analyse thermogravimétrique démontrent clairement la possibilité d'utiliser la lignine dans la formulation des résines phénoliques. Les paramètres cinétiques obtenus suite aux analyses AED, ainsi que les isothermes calculés à l'aide de ces derniers paramètres, démontrent que l'énergie d'activation, la chaleur de polymérisation et le degré de conversion du polymère constituent des paramètres efficaces pour prédire, avec une bonne précision, l'effet de l'utilisation d'une lignine dans la formulation de nouvelles résines phénoliques. Differential scanning calorimetry (DSC) and thermogravimetry (TG) were used to characterize various types of lignin and phenol-formadehyde resin (PF), as well as lignin-based phenolic resins (LPF) as mixtures with 20, 30 and 40% PF replacement by lignin. These studies have allowed comparison of thermal stability of the lignins and characterization of the curing reaction of LPF mixtures. The thermal properties as determined by TG have shown that lignin can be used as a copolymer in phenolic adhesives. The kinetic parameters (the activation energy, the heat of reaction and the degree of polymer conversion) obtained by DSC, as well as the isotherms calculated with these parameters, are effective in the accurate representation of the role of lignin in lignin-based phenolic resin formulations." @default.
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- W2022366772 date "1993-04-01" @default.
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- W2022366772 title "Caracterisation cinetique par analyse enthalpique differentielle des resines phenol-formaldehyde a base de lignosulfonates" @default.
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- W2022366772 doi "https://doi.org/10.1016/0014-3057(93)90004-y" @default.
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