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<p>This study evaluates electrospun polylactic acid (PLA) membranes reinforced with graphene nanoplatelets (GnP) at concentrations of 0, 1, 2, and 10 w/w%. We analyzed their morphological, thermal, electrical, and mechanical properties to determine whether GnP addition can enhance thermal stability and mechanical response without compromising electrical insulation, a critical requirement for flexible biomedical and dielectric applications. Scanning electron microscopy (SEM) revealed graphene agglomerates within the fibers, which prevented the formation of an electrically percolating network. Consequently, all formulations remained electrically insulating, as confirmed by the absence of electrical signals during mechanical cycling tests on membranes with 2 and 10 w/w% GnP. Thermal analysis using differential scanning calorimetry (DSC) and thermogravimetry (TGA) showed that GnP incorporation improves thermal stability, with the 2 w/w% composite exhibiting an 11.7 °C increase in maximum degradation temperature. DC resistivity measurements using a Megger reached up to 7.54 TΩ·cm, while AC measurements gave values around 13.8 MΩ·cm. These results classify the material as a conventional electrical insulator under ASTM D257-14. Overall, the 2 w/w% GnP composition offers the best balance of properties for applications requiring flexible, biocompatible dielectric materials.</p>

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Polylactic acid (PLA) membranes reinforced with graphene nanoplatelets (GnP): processing, thermal, electrical and mechanical characterization

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Mercy Tatiana Villate-Fonseca,
  • M. Carolina Pazos,
  • Carlos Andrés Palacio-Gómez

摘要

This study evaluates electrospun polylactic acid (PLA) membranes reinforced with graphene nanoplatelets (GnP) at concentrations of 0, 1, 2, and 10 w/w%. We analyzed their morphological, thermal, electrical, and mechanical properties to determine whether GnP addition can enhance thermal stability and mechanical response without compromising electrical insulation, a critical requirement for flexible biomedical and dielectric applications. Scanning electron microscopy (SEM) revealed graphene agglomerates within the fibers, which prevented the formation of an electrically percolating network. Consequently, all formulations remained electrically insulating, as confirmed by the absence of electrical signals during mechanical cycling tests on membranes with 2 and 10 w/w% GnP. Thermal analysis using differential scanning calorimetry (DSC) and thermogravimetry (TGA) showed that GnP incorporation improves thermal stability, with the 2 w/w% composite exhibiting an 11.7 °C increase in maximum degradation temperature. DC resistivity measurements using a Megger reached up to 7.54 TΩ·cm, while AC measurements gave values around 13.8 MΩ·cm. These results classify the material as a conventional electrical insulator under ASTM D257-14. Overall, the 2 w/w% GnP composition offers the best balance of properties for applications requiring flexible, biocompatible dielectric materials.