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Biobased Adhesives from African Mahogany Tannins: Characterization by 1H and 13C NMR and Physicochemical Properties
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The study of the development of tannin-based adhesives from the African mahogany Khaya ivorensis A. Chev tannins condensed hexamine was carried out. Tannins from the bark, sapwood, and heartwood were extracted employing the industrial method (NaOH/Na2SO3/NaHSO3) and they were used to synthesize different formulations of biobased adhesives. Tannins/hexamine/water adhesives obtained were characterized by differential scanning analysis (DSC) to know their physical changes under heat action. Polymerization temperatures were between 90°C and 153°C. These adhesives heat resistance was studied by thermogravimetric analysis (TGA). Results showed good thermal stabilities properties for adhesives with degradation temperatures between 225°C and 250°C. Besides, a thermomechanical analysis (TMA) shows a high value of elasticity modulus for these adhesives. Finally, 2D HSQC NMR analysis was performed to confirm the good reactivity between African mahogany tannins and hexamine linked with strong bounds.
Title: Biobased Adhesives from African Mahogany Tannins: Characterization by 1H and 13C NMR and Physicochemical Properties
Description:
The study of the development of tannin-based adhesives from the African mahogany Khaya ivorensis A.
Chev tannins condensed hexamine was carried out.
Tannins from the bark, sapwood, and heartwood were extracted employing the industrial method (NaOH/Na2SO3/NaHSO3) and they were used to synthesize different formulations of biobased adhesives.
Tannins/hexamine/water adhesives obtained were characterized by differential scanning analysis (DSC) to know their physical changes under heat action.
Polymerization temperatures were between 90°C and 153°C.
These adhesives heat resistance was studied by thermogravimetric analysis (TGA).
Results showed good thermal stabilities properties for adhesives with degradation temperatures between 225°C and 250°C.
Besides, a thermomechanical analysis (TMA) shows a high value of elasticity modulus for these adhesives.
Finally, 2D HSQC NMR analysis was performed to confirm the good reactivity between African mahogany tannins and hexamine linked with strong bounds.
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