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<p>Thermal, permeability, mechanical and viscoelastic properties of PLA/SiO<sub>2</sub> nanocomposites (containing up to 5 wt% of chemically treated nanosilica) were investigated as a function of the density of the nanosilica aggregates/agglomerates. The analysis of the thermal properties showed that non-strong interactions were established between PLA and the nanosilica. From the experimental density of the nanocomposites, the density of the nanosilica aggregates/agglomerates was derived, as well as the volume fraction of the empty spaces within them, confirming morphological observations. The permeability of the PLA/SiO<sub>2</sub> nanocomposites to oxygen and water vapor was investigated and interpreted by considering the voids introduced by the nanosilica aggregates/agglomerates and the matrix free volume. Oxygen permeability decreased with the nanosilica amount for both amorphous and semi-crystalline nanocomposites, whereas water vapor permeability increased. The permeability to water vapor turned out to be mainly dependent on the gas diffusivity, whereas the permeability to oxygen on the gas solubility. The mechanical characterization showed that the elastic moduli tended to slightly decrease with increasing the SiO<sub>2</sub> amount, due to the weak interactions established between PLA and nanosilica. The viscoelastic analysis demonstrated that the presence of voids in the nanosilica aggregates/agglomerates hindered the formation of a resistant nanofillers network. The fragmentation rate of the nanocomposites was found to be comparable to that of neat PLA.</p>

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Effect of nanosilica aggregates on functional properties of poly(lactic acid)-based nanocomposites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月4日

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  • Giovanna Molinari,
  • Lucia Ricci,
  • Carlo Andrea Massa,
  • Paola Parlanti,
  • Mauro Gemmi,
  • Elettra Savigni,
  • Annamaria Celli,
  • Chiara Pedrotti,
  • Maurizia Seggiani,
  • Maria Cristina Righetti

摘要

Thermal, permeability, mechanical and viscoelastic properties of PLA/SiO2 nanocomposites (containing up to 5 wt% of chemically treated nanosilica) were investigated as a function of the density of the nanosilica aggregates/agglomerates. The analysis of the thermal properties showed that non-strong interactions were established between PLA and the nanosilica. From the experimental density of the nanocomposites, the density of the nanosilica aggregates/agglomerates was derived, as well as the volume fraction of the empty spaces within them, confirming morphological observations. The permeability of the PLA/SiO2 nanocomposites to oxygen and water vapor was investigated and interpreted by considering the voids introduced by the nanosilica aggregates/agglomerates and the matrix free volume. Oxygen permeability decreased with the nanosilica amount for both amorphous and semi-crystalline nanocomposites, whereas water vapor permeability increased. The permeability to water vapor turned out to be mainly dependent on the gas diffusivity, whereas the permeability to oxygen on the gas solubility. The mechanical characterization showed that the elastic moduli tended to slightly decrease with increasing the SiO2 amount, due to the weak interactions established between PLA and nanosilica. The viscoelastic analysis demonstrated that the presence of voids in the nanosilica aggregates/agglomerates hindered the formation of a resistant nanofillers network. The fragmentation rate of the nanocomposites was found to be comparable to that of neat PLA.