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<p>Highly oriented poly(vinylidene fluoride) (PVDF) ultrathin films with different <i>β</i>-phase contents were prepared using the melt-draw method. The effect of <i>β</i>-phase content on <i>α</i>-<i>β</i> phase transition of highly oriented PVDF ultrathin films induced by stretching was investigated using transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. The results show that stretching can enhance the crystallinity and increase the average thickness of the lamellae. A full <i>α</i>-<i>β</i> phase transition can be achieved for PVDF ultrathin films of 20.6% <i>β</i> phase stretched to a <i>λ</i> (stretching ratio) of 1.5, while few <i>α</i> phases still exist for ultrathin films of 35.0% <i>β</i> phase, together with bent and tilted lamellae. Compared to thicker PVDF films undergoing stretching-induced <i>α</i>-<i>β</i> phase transition, the higher <i>α</i>-<i>β</i> phase transition efficiency of the PVDF ultrathin films can be attributed to the parallel aligned lamellar structure. Moreover, a higher <i>β</i>-phase content can suppress <i>α</i>-<i>β</i> phase transition because of the stress concentration effect of <i>β</i>-phase. Ultimately, these results provide valuable insights into the stretching-induced <i>α</i>-<i>β</i> phase transition of PVDF ultrathin films.</p>

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Influence of β-Phase Content on the Stretching-induced α-β Phase Transition of Highly Oriented Poly(vinylidene fluoride) Ultrathin Films

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Hai-Peng Li,
  • Jia-Meng Liang,
  • Rui-Hao Zheng,
  • Han-Qi Zhu,
  • Wen-Peng Zhao,
  • Yun-Peng Li,
  • Shao-Juan Wang,
  • Hao Zhang,
  • Shou-Ke Yan

摘要

Highly oriented poly(vinylidene fluoride) (PVDF) ultrathin films with different β-phase contents were prepared using the melt-draw method. The effect of β-phase content on α-β phase transition of highly oriented PVDF ultrathin films induced by stretching was investigated using transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. The results show that stretching can enhance the crystallinity and increase the average thickness of the lamellae. A full α-β phase transition can be achieved for PVDF ultrathin films of 20.6% β phase stretched to a λ (stretching ratio) of 1.5, while few α phases still exist for ultrathin films of 35.0% β phase, together with bent and tilted lamellae. Compared to thicker PVDF films undergoing stretching-induced α-β phase transition, the higher α-β phase transition efficiency of the PVDF ultrathin films can be attributed to the parallel aligned lamellar structure. Moreover, a higher β-phase content can suppress α-β phase transition because of the stress concentration effect of β-phase. Ultimately, these results provide valuable insights into the stretching-induced α-β phase transition of PVDF ultrathin films.