An electret and a preparation process thereof
By introducing 1-4% porosity and more than 17% β-crystalline phase into PVDF electret, and combining it with 3D printing technology, a stable porous network is formed, which solves the bottleneck of improving the dielectric constant of PVDF thin films and achieves a breakthrough in high dielectric performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-22
- Publication Date
- 2026-07-17
AI Technical Summary
In existing technologies, the increase in β-phase content of PVDF films is limited, making it difficult to further improve the dielectric constant. Furthermore, pores are treated as defects and eliminated, lacking the proactive development of microporous networks.
By controlling the porosity of the PVDF electret to 1-4% and the β-phase content to be no less than 17%, the electret is prepared under a specific environment using 3D printing technology to form a stable porous network to retain charges. Combined with the control of substrate temperature and printing voltage, high dielectric properties are achieved.
The relative permittivity was significantly improved to over 22 with low β phase content, providing a new design path for flexible high dielectric materials.
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Figure CN122404877A_ABST
Abstract
Citation Information
Patent Citations
Preparation method of high-beta-phase PVDF film and application
CN111958999A