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<p>This paper presents the production of CNF cryogels incorporated with poly(lactic acid) (PLA) nanoparticles, aiming at improving the water resistance by a methodology that avoids the use of crosslinkers or chemical reactions to increase the hydrophobic character of CNF cryogels. For this purpose, a PLA nanoemulsion was produced, using a bio-based surfactant. Dynamic light scattering (DLS) confirmed that particles were at the nanoscale range. PLA nanoemulsion was then mixed with CNF suspension, and cryogels were obtained by freeze-drying method. Finally, samples were thermally treated at 180&#xa0;°C for 20&#xa0;min. Results showed that the incorporation of PLA nanoparticles in CNF cryogels was possible because PLA was adsorbed onto the CNF surface. However, the presence of PLA itself was not sufficient to result in increased water resistance. This improvement was observed only after conducting thermal treatment. For these cases, the improvement of water resistance was confirmed by the contact angle and water absorption tests, in which CNF/PLA cryogel thermally treated presented lower water absorption and lower mass loss compared to the other samples. Thus, this investigation can provide insights to the development of materials in fields such as biomedical, filtration, packaging, among others.</p>

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Enhancement of cellulose nanofiber (CNF) cryogel hydrophobicity through physisorption and melt templating of poly(lactic acid) (PLA) nanoparticles

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Ana Beatriz Valim Suquisaqui,
  • Sílvia Helena Prado Bettini,
  • Julien Bras

摘要

This paper presents the production of CNF cryogels incorporated with poly(lactic acid) (PLA) nanoparticles, aiming at improving the water resistance by a methodology that avoids the use of crosslinkers or chemical reactions to increase the hydrophobic character of CNF cryogels. For this purpose, a PLA nanoemulsion was produced, using a bio-based surfactant. Dynamic light scattering (DLS) confirmed that particles were at the nanoscale range. PLA nanoemulsion was then mixed with CNF suspension, and cryogels were obtained by freeze-drying method. Finally, samples were thermally treated at 180 °C for 20 min. Results showed that the incorporation of PLA nanoparticles in CNF cryogels was possible because PLA was adsorbed onto the CNF surface. However, the presence of PLA itself was not sufficient to result in increased water resistance. This improvement was observed only after conducting thermal treatment. For these cases, the improvement of water resistance was confirmed by the contact angle and water absorption tests, in which CNF/PLA cryogel thermally treated presented lower water absorption and lower mass loss compared to the other samples. Thus, this investigation can provide insights to the development of materials in fields such as biomedical, filtration, packaging, among others.