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<p>Addressing the growing challenge of oil pollution, this study presents a green and efficient strategy for fabricating biodegradable poly(lactic acid)/poly(butylene adipate-co-terephthalate)/talc (PLA/PBAT/Talc) composite foams with high volume expansion ratio (VER), excellent compression resilience, and superior oil absorption performance via synergistic melt blending and supercritical CO<sub>2</sub> (scCO<sub>2</sub>) batch foaming. By strategically incorporating PBAT (10 wt %) and talc (3 wt %) into the PLA matrix, and by optimizing the foaming temperatures, the melt strength and crystallization behavior were effectively tailored. The resultant PLA/PBAT-T3 foam achieved a VER exceeding 45 and an open-cell content (OCC) of 85%. Cyclic compression tests demonstrated that the PLA/PBAT-T3 foam fabricated at 100 °C exhibited the lowest permanent deformation, indicating superior structural integrity. Remarkably, the foam exhibited equilibrium oil absorption capacities (<i>Q</i><sub><i>t</i></sub>) of 22.2 g·g<sup>−1</sup> for silicone oil and 13.4 g·g<sup>−1</sup> for cyclohexane. A significant correlation was established, revealing that <i>Q</i><sub><i>t</i></sub> is directly proportional to the multiplication of VER and OCC. The foam also demonstrated excellent reusability, retaining over 85% of its initial absorption capacity after 10 consecutive absorption-desorption cycles. This work provides a viable strategy for engineering biodegradable and recyclable oil-sorbent materials, while also advancing the application potential of PLA-based composites in sustainable environmental remediation technologies.</p>

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Biodegradable poly(lactic acid)-based composite open-cell foam fabricated by supercritical CO2 foaming for reusable and selective oil-adsorption

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • Jing Jiang,
  • Suyu Yang,
  • Zihui Li,
  • Yang Yang,
  • Changwei Zhu,
  • Qian Li

摘要

Addressing the growing challenge of oil pollution, this study presents a green and efficient strategy for fabricating biodegradable poly(lactic acid)/poly(butylene adipate-co-terephthalate)/talc (PLA/PBAT/Talc) composite foams with high volume expansion ratio (VER), excellent compression resilience, and superior oil absorption performance via synergistic melt blending and supercritical CO2 (scCO2) batch foaming. By strategically incorporating PBAT (10 wt %) and talc (3 wt %) into the PLA matrix, and by optimizing the foaming temperatures, the melt strength and crystallization behavior were effectively tailored. The resultant PLA/PBAT-T3 foam achieved a VER exceeding 45 and an open-cell content (OCC) of 85%. Cyclic compression tests demonstrated that the PLA/PBAT-T3 foam fabricated at 100 °C exhibited the lowest permanent deformation, indicating superior structural integrity. Remarkably, the foam exhibited equilibrium oil absorption capacities (Qt) of 22.2 g·g−1 for silicone oil and 13.4 g·g−1 for cyclohexane. A significant correlation was established, revealing that Qt is directly proportional to the multiplication of VER and OCC. The foam also demonstrated excellent reusability, retaining over 85% of its initial absorption capacity after 10 consecutive absorption-desorption cycles. This work provides a viable strategy for engineering biodegradable and recyclable oil-sorbent materials, while also advancing the application potential of PLA-based composites in sustainable environmental remediation technologies.