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<p>Polycaprolactone (PCL) polymer samples with different molecular weights (30–33 000) were synthesized using gallium-containing catalysts for ring-opening polymerization of ε-caprolactone. The synthesized polymer samples were characterized by a set of physicochemical methods (GPC, IR spectroscopy, NMR). The processes of chemical degradation of the synthesized polymers were studied. The complete dissolution and degradation of polymer molecules, including to 6-hydroxycaproic acid, in an aqueous-ethanol solution (1: 1 <i>v/v</i>) of caustic soda (1 <i>M</i> NaOH) was shown to be achieved at 65 °C within 30 h with permanent stirring (300 rpm). The compositions of the prepared solutions were studied by IR spectroscopy and <sup>1</sup>H and <sup>13</sup>C NMR spectroscopy. The solutions obtained after the destruction of various PCL were tested as components of culture media for growth of various microorganisms and biocatalytic transformation into diverse products: biogas, bacterial nanocellulose, biomass of oil-degrading bacterial cells, and microalgae. The two-stage process was proposed for PCL waste processing, which corresponds to requirements of the modern environmental standards from the viewpoint of safety and resource saving.</p>

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Chemical and microbiological degradation of polycaprolactone prepared under different synthesis conditions

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • E. N. Efremenko,
  • O. V. Maslova,
  • M. U. Agaeva,
  • O. V. Senko,
  • N. A. Stepanov,
  • A. G. Aslanli,
  • S. S. Karlov

摘要

Polycaprolactone (PCL) polymer samples with different molecular weights (30–33 000) were synthesized using gallium-containing catalysts for ring-opening polymerization of ε-caprolactone. The synthesized polymer samples were characterized by a set of physicochemical methods (GPC, IR spectroscopy, NMR). The processes of chemical degradation of the synthesized polymers were studied. The complete dissolution and degradation of polymer molecules, including to 6-hydroxycaproic acid, in an aqueous-ethanol solution (1: 1 v/v) of caustic soda (1 M NaOH) was shown to be achieved at 65 °C within 30 h with permanent stirring (300 rpm). The compositions of the prepared solutions were studied by IR spectroscopy and 1H and 13C NMR spectroscopy. The solutions obtained after the destruction of various PCL were tested as components of culture media for growth of various microorganisms and biocatalytic transformation into diverse products: biogas, bacterial nanocellulose, biomass of oil-degrading bacterial cells, and microalgae. The two-stage process was proposed for PCL waste processing, which corresponds to requirements of the modern environmental standards from the viewpoint of safety and resource saving.