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Epoxidation of low-molecular-weight Euphorbia lactiflua natural rubber with “in situ” formed performic acid

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Summary

The epoxidation of low-molecular-weight natural rubber isolated from Euphorbia lactiflua latex was accomplished. The reaction was performed using formic peracid formed “in situ” from hydrogen peroxide and formic acid. Different temperatures, ratio of H2O2 to isoprene units and H2O2 to HCOOH were used. The products were characterized by infrared spectroscopy (IR), 1H and 13C nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC) and elementary analysis. 1H-NMR was used quantitatively to calculate epoxidation levels. Maximum epoxidation reached was 89.4%. DSC results record a linear relationship between percent epoxidation and Tg.

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Authors and Affiliations

  1. Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 3-C, Concepción, Chile

    Sara Gnecco

  2. Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 3-C, Concepción, Chile

    Amalia Pooley & Marcela Krause

Authors
  1. Sara Gnecco
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  2. Amalia Pooley
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  3. Marcela Krause
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Gnecco, S., Pooley, A. & Krause, M. Epoxidation of low-molecular-weight Euphorbia lactiflua natural rubber with “in situ” formed performic acid. Polymer Bulletin 37, 609–615 (1996). https://doi.org/10.1007/BF00296606

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  • DOI: https://doi.org/10.1007/BF00296606

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