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The increasing use of plastic materialsEpoxy composites has driven the search for eco-friendly alternatives, including plant-based compositesComposites aimed at reducing petrochemical-derived components. Epoxidized soybean oil (ESO), produced via epoxidation of soybean oil, is a renewable resource suitable for epoxy resinEpoxy resin synthesis. However, conventional polymersPolymer and compositesComposites are susceptible to UV degradation, affecting their performance. In this study, kraft lignin was investigated as an additive in ESO-based epoxy compositesEpoxy composites (OSE20) for its UV-protective properties. Forty tensile specimens were fabricated with 20% ESO and varying lignin content (0%, 10%, 20%, and 30%). Half of the samples were exposed to UV radiation. Results showed that lignin effectively mitigated UV degradation, while samples without lignin exhibited greater damage. Despite this, mechanical strength decreased in all lignin-containing formulations. FTIRFourier-Transform Infrared Spectroscopy (FTIR) spectra showed no clear chemical changes. Thermal analysisThermal analysis revealed that lignin modified the degradation temperatures. Overall, lignin shows promise but requires further investigation to optimize mechanical performance.

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Evaluation of the Influence of Kraft Lignin on the Ultraviolet Degradation of Epoxy Composites with Epoxidized Soybean Oil

  • 会议论文

  • 发表日期：

    2026年

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  • Paulo Roberto Correia Marcelino,
  • Felipe Perissé Duarte Lopes,
  • Hemanuelly Ferreira Breda Lan Oliveira,
  • Michel Picanço Oliveira

摘要

The increasing use of plastic materialsEpoxy composites has driven the search for eco-friendly alternatives, including plant-based compositesComposites aimed at reducing petrochemical-derived components. Epoxidized soybean oil (ESO), produced via epoxidation of soybean oil, is a renewable resource suitable for epoxy resinEpoxy resin synthesis. However, conventional polymersPolymer and compositesComposites are susceptible to UV degradation, affecting their performance. In this study, kraft lignin was investigated as an additive in ESO-based epoxy compositesEpoxy composites (OSE20) for its UV-protective properties. Forty tensile specimens were fabricated with 20% ESO and varying lignin content (0%, 10%, 20%, and 30%). Half of the samples were exposed to UV radiation. Results showed that lignin effectively mitigated UV degradation, while samples without lignin exhibited greater damage. Despite this, mechanical strength decreased in all lignin-containing formulations. FTIRFourier-Transform Infrared Spectroscopy (FTIR) spectra showed no clear chemical changes. Thermal analysisThermal analysis revealed that lignin modified the degradation temperatures. Overall, lignin shows promise but requires further investigation to optimize mechanical performance.