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<p>In this work, highly porous biodegradable poly(lactic acid) (PLA) foams with bi-modal architecture were prepared by using the melt-compounding process in a twin-screw extruder and filler leaching technique. The highly-filled composites of PLA/salt porogen were extruded and then, subjected to distilled water to obtain lightweight inter-connected nano- and micro-cellular structure for foams with 100% open cell content. The density of PLA diminished from 1.14&#xa0;g/cm<sup>3</sup> to 0.3&#xa0;g/cm<sup>3</sup> by using these simple and economical preparation methods. In the presence of poly(ethylene glycol) (PEG) plasticizer, the void content of open-cell PLA foam reached 72%. The bi-modal cell size distribution of foams was created by the partial miscibility of PLA/PEG phase and salt. The cell density of prepared foams rose to 6 × 10<sup>7</sup> cells/cm<sup>3</sup> by adding 15 wt% PEG to the PLA melt. The presence of PEG in the PLA melt affected the microstructure and mechanical properties of foams by altering the melt viscosity and surface tension. These open-cell bi-modal porous foams, which are biocompatible and biodegradable, can be applied in biomedical and pollutant adsorption applications. The adsorption capacities of the open-cell foams were measured for different solvents and marine pollutants. The adsorption capacity of these foams reached 4&#xa0;g/g for carbon tetrachloride.</p>

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Highly-Porous Plasticized Polylactide Foams with Bi-modal Structure Prepared via a Combined Economical Process: Processing-Morphology-Performance Correlations

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Pedram Bahrami,
  • Danial Abbasi,
  • Ali Matin,
  • Reyhane Shahpouri,
  • Farkhondeh Hemmati,
  • Jamshid Mohammadi-Roshandeh

摘要

In this work, highly porous biodegradable poly(lactic acid) (PLA) foams with bi-modal architecture were prepared by using the melt-compounding process in a twin-screw extruder and filler leaching technique. The highly-filled composites of PLA/salt porogen were extruded and then, subjected to distilled water to obtain lightweight inter-connected nano- and micro-cellular structure for foams with 100% open cell content. The density of PLA diminished from 1.14 g/cm3 to 0.3 g/cm3 by using these simple and economical preparation methods. In the presence of poly(ethylene glycol) (PEG) plasticizer, the void content of open-cell PLA foam reached 72%. The bi-modal cell size distribution of foams was created by the partial miscibility of PLA/PEG phase and salt. The cell density of prepared foams rose to 6 × 107 cells/cm3 by adding 15 wt% PEG to the PLA melt. The presence of PEG in the PLA melt affected the microstructure and mechanical properties of foams by altering the melt viscosity and surface tension. These open-cell bi-modal porous foams, which are biocompatible and biodegradable, can be applied in biomedical and pollutant adsorption applications. The adsorption capacities of the open-cell foams were measured for different solvents and marine pollutants. The adsorption capacity of these foams reached 4 g/g for carbon tetrachloride.