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Mimosa and chestnut tannin extracts reacted with hexamine in solution

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Abstract

Autocondensation reactions of mimosa and chestnut tannin extracts solutions have been analysed at several pH by differential scanning calorimetry (DSC). Alkaline pH promotes autocondensation reaction of these tannins. Curing reactions between these tannins and hexamine at acid and not strongly alkaline pH have been proved by DSC. Thermal analysis gives insights not only on reactions between tannin and hexamine, but also about water presence on solutions and degradation reactions of tannins. Products obtained from reactions between tannins and hexamine have been analysed by Fourier transform infrared spectroscopy (FTIR). The obtained chemical structures are influenced by both chemical structure of tannin and pH of solution. For mimosa tannin amine and ether groups are obtained while for hydrolysable chestnut tannin amide groups have been detected.

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Authors and Affiliations

  1. ‘Materials+Technologies’ Group, Escuela Politécnica, Dpto. Ingeniería Química y M. Ambiente, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Pza. Europa, 1, 20018, Donostia/San Sebastián, Spain

    C. Peña, K. de la Caba, A. Retegi, C. Ocando, J. Labidi & I. Mondragon

  2. Hexion Specialty Chemicals S.A., Ctra. Navarra, Epele 39, 20120, Hernani, Spain

    J. M. Echeverria

Authors
  1. C. Peña
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  2. K. de la Caba
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  3. A. Retegi
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  4. C. Ocando
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  5. J. Labidi
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  6. J. M. Echeverria
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  7. I. Mondragon
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Correspondence to I. Mondragon.

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Peña, C., de la Caba, K., Retegi, A. et al. Mimosa and chestnut tannin extracts reacted with hexamine in solution. J Therm Anal Calorim 96, 515–521 (2009). https://doi.org/10.1007/s10973-007-8352-9

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  • DOI: https://doi.org/10.1007/s10973-007-8352-9

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