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<p>Poly (vinylidene fluoride) (PVDF) is widely investigated due to its outstanding pyro and piezoelectric properties among the polymers in various sensor and actuator applications. The existence of these properties depends on the degree of crystallinity, structure and orientation of the polymer, which are influenced by the processing conditions. PVDF films were prepared by hot pressing technique which is in α-phase and then thermo mechanically stretched into β-phase. The quality and structure of the β-phase determine good piezoelectric properties hence its development is a major area of study. In this work, lightweight, flexible PVDF films in the 20–100&#xa0;µm range have been developed indigenously for high sensing applications that need to be installed on curved surfaces and entail bending and shock. α-phase PVDF films of 80, 120, 160, 200 and 400&#xa0;µm thickness have been produced by the hot-press method using different pressing conditions. Films were then thermo mechanically stretched with stretching factor of 3.5–4 times to obtain the films of 20, 30, 40, 50 and 100&#xa0;µm thickness. The obtained films were then characterized for confirmation of β-phase by XRD, SEM, FTIR and DSC in terms of their structural and surface morphological changes. Thinner 20&#xa0;µm PVDF sensor shows piezoelectric coefficient (d<sub>33</sub>) of 21 pC/N and sensitivity of 4.40&#xa0;V by piezo meter and oscilloscope respectively. PVDF film thickness has a strong influence on the piezoelectric properties and sensitivity. Therefore, thinner PVDF films plays a major role in high sensing applications of aerospace domain.</p>

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Optimization of indigenously developed thin piezoelectric PVDF films for high sensing applications

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Enoos Dange,
  • Anjana Jain

摘要

Poly (vinylidene fluoride) (PVDF) is widely investigated due to its outstanding pyro and piezoelectric properties among the polymers in various sensor and actuator applications. The existence of these properties depends on the degree of crystallinity, structure and orientation of the polymer, which are influenced by the processing conditions. PVDF films were prepared by hot pressing technique which is in α-phase and then thermo mechanically stretched into β-phase. The quality and structure of the β-phase determine good piezoelectric properties hence its development is a major area of study. In this work, lightweight, flexible PVDF films in the 20–100 µm range have been developed indigenously for high sensing applications that need to be installed on curved surfaces and entail bending and shock. α-phase PVDF films of 80, 120, 160, 200 and 400 µm thickness have been produced by the hot-press method using different pressing conditions. Films were then thermo mechanically stretched with stretching factor of 3.5–4 times to obtain the films of 20, 30, 40, 50 and 100 µm thickness. The obtained films were then characterized for confirmation of β-phase by XRD, SEM, FTIR and DSC in terms of their structural and surface morphological changes. Thinner 20 µm PVDF sensor shows piezoelectric coefficient (d33) of 21 pC/N and sensitivity of 4.40 V by piezo meter and oscilloscope respectively. PVDF film thickness has a strong influence on the piezoelectric properties and sensitivity. Therefore, thinner PVDF films plays a major role in high sensing applications of aerospace domain.