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<p>Micro-Brillouin light scattering spectroscopy was applied for the first time, to best of our knowledge, to study the micromechanics of single polyvinylidene fluoride (PVDF) electrospun fibres. Such fibres presenting electroactive properties are developed in view of sensor and energy harvesting applications. Electrospinning is a particularly promising innovative technique allowing the fabrication of nanofibres from a polymeric solution, recognised as a reliable, low-cost, tuneable method to produce fibres in the nanometre to micrometre scale. Depending on the solvent ratio in the electrospinning solution (acetone and dimethylformamide mix), the studied fibres showed a striking difference in the Brillouin spectra and thus elastic properties. These electrospun fibres with different solvents ratio present different surface aspect, and the variation in elastic constant is interpreted in terms of mesoporosity related to solvent evaporation rate. Another very interesting feature is an unexpected elastic anomaly observed in a temperature-dependant study of a single electrospun fibre. Micro-Brillouin spectra show a clear change of slope in the variation of the elastic constant c11 with temperature, similar to what can be observed for a glass transition, at a determined temperature of 31 °C. This temperature does not correspond to the usual glass transition temperature of PVDF, located as described in literature around − 40 °C. This elastic anomaly could be interpreted as a reorientation at the amorphous-crystalline interphase in mechanically oriented materials. A phenomenon of melting of imperfect α crystals happening at lower temperature compared to the main melting temperature of PVDF has also been observed.</p>

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Mechanical properties of PVDF electrospun single fibre studied by Brillouin microscopy

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Maïté Fernandes Tronco,
  • Rafael J. Jiménez Riobóo,
  • Marc Ponçot,
  • Sébastien Hupont,
  • Nandakumar Kalarikkal,
  • Sreelakshmi Moozhiyil Purushothaman,
  • Isabelle Royaud,
  • Sabu Thomas,
  • Didier Rouxel

摘要

Micro-Brillouin light scattering spectroscopy was applied for the first time, to best of our knowledge, to study the micromechanics of single polyvinylidene fluoride (PVDF) electrospun fibres. Such fibres presenting electroactive properties are developed in view of sensor and energy harvesting applications. Electrospinning is a particularly promising innovative technique allowing the fabrication of nanofibres from a polymeric solution, recognised as a reliable, low-cost, tuneable method to produce fibres in the nanometre to micrometre scale. Depending on the solvent ratio in the electrospinning solution (acetone and dimethylformamide mix), the studied fibres showed a striking difference in the Brillouin spectra and thus elastic properties. These electrospun fibres with different solvents ratio present different surface aspect, and the variation in elastic constant is interpreted in terms of mesoporosity related to solvent evaporation rate. Another very interesting feature is an unexpected elastic anomaly observed in a temperature-dependant study of a single electrospun fibre. Micro-Brillouin spectra show a clear change of slope in the variation of the elastic constant c11 with temperature, similar to what can be observed for a glass transition, at a determined temperature of 31 °C. This temperature does not correspond to the usual glass transition temperature of PVDF, located as described in literature around − 40 °C. This elastic anomaly could be interpreted as a reorientation at the amorphous-crystalline interphase in mechanically oriented materials. A phenomenon of melting of imperfect α crystals happening at lower temperature compared to the main melting temperature of PVDF has also been observed.