Preparation of PVDF/BTO Piezoelectric Films by Cyclic Dynamic Force Field Synergistic Electrospinning

LIU Xiaoxiao; HUANG Yunzhi; HE Hezhi; HUANG Zhaoxia

doi:10.3969/j.issn.1674-6457.2026.07.020

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (7) : 220-227. DOI: 10.3969/j.issn.1674-6457.2026.07.020

Polymer Materials Manufacturing

Preparation of PVDF/BTO Piezoelectric Films by Cyclic Dynamic Force Field Synergistic Electrospinning

LIU Xiaoxiao¹, HUANG Yunzhi², HE Hezhi², HUANG Zhaoxia^2,*

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Abstract

The work aims to develop a mild, efficient, and controllable processing strategy for preparing PVDF-based composite films that combine high piezoelectric response with excellent mechanical strength. A multi-field coupled processing method combining electrospinning with a cyclic dynamic force field was proposed. In this process, the stretching effect of the electrostatic field was used to initially induce PVDF molecular-chain orientation and promote formation of the β phase. Then, the as-spun films were post-treated by applying a cyclic dynamic force field. Wide-angle X-ray diffraction (WAXD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) were used to analyze the structural evolution of PVDF/BTO composite films under the electrostatic field and the cyclic dynamic force field, and the interactions among ferroelectric, dielectric, and piezoelectric were revealed by polarization-electric field (P-E) hysteresis loops and broadband dielectric spectroscopy (BDS). The results showed that the cyclic dynamic force field could further increase the β-phase content from 73.8% to 86.7% during post-treatment, while achieving an ultrahigh piezoelectric coefficient of 39.9 pC/N and an excellent mechanical strength of 50.2 MPa, together with good sensitivity and linearity. This work successfully establishes a novel and efficient fabrication strategy that, through the synergy of electrospinning and a cyclic dynamic force field, effectively enhances the β-phase content, piezoelectric response, and mechanical toughness of PVDF/BTO composite films. The process conditions are mild and highly controllable, and the films show great application potential in fields such as self-powered flexible pressure sensors, wearable devices, and energy harvesting.

Key words

composite film / electrospinning / dynamic force field / β phase / piezoelectric performance

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LIU Xiaoxiao, HUANG Yunzhi, HE Hezhi, HUANG Zhaoxia. Preparation of PVDF/BTO Piezoelectric Films by Cyclic Dynamic Force Field Synergistic Electrospinning[J]. Journal of Netshape Forming Engineering. 2026, 18(7): 220-227 https://doi.org/10.3969/j.issn.1674-6457.2026.07.020

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Funding

The National Natural Science Foundation of China (52373035); Scientific Research Project of Guangdong Provincial Department of Education (2024B03J1242); Scientific Research Project of Guangdong Provincial Department of Education (2022KCXTD044)