Polyvinylidene fluoride dielectric composite film and method for preparing the same

CN118852690BActive Publication Date: 2026-05-26SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Filing Date
2024-08-13
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Traditional methods for preparing β-PVDF thin films are complex and costly, and filler blending leads to increased dielectric loss and reduced breakdown strength, limiting their application in energy storage devices.

Method used

Polyvinylidene fluoride (PVDF) was treated with defluorinated hydrogen and lead zirconate titanate powder was added. PVDF dielectric composite films were then prepared by solution casting and hot pressing to modify the molecular structure, thereby increasing the β-phase content and dielectric constant, and reducing dielectric loss.

Benefits of technology

The preparation process has been simplified, equipment costs have been reduced, and stable composite films with high dielectric constant and low dielectric loss have been prepared, making them suitable for large-scale production.

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Abstract

This invention belongs to the field of polymer films and discloses a polyvinylidene fluoride (PVDF) dielectric composite film and its preparation method. The method includes: mixing PVDF and N,N-dimethylformamide to obtain a PVDF solution; adding a defluorinating agent to the PVDF solution and curing it into a block to obtain a PVDF block; mixing the PVDF block, lead zirconate titanate powder, and N,N-dimethylformamide and curing them into a film to obtain the PVDF dielectric composite film. Firstly, the molecular structure of PVDF is altered after defluorination treatment. Then, lead zirconate titanate is added to induce a phase transition, gradually decreasing the relative strength of the nonpolar α phase and gradually increasing the relative strength of the corresponding polar β phase in PVDF. This significantly increases the dielectric constant of the composite film, resulting in low dielectric loss under high fields and good insulation properties. Furthermore, the process is simple, the equipment is inexpensive, and a stable composite film containing a large amount of β phase can be prepared in a short time, making it suitable for large-scale production and possessing broad research value and application prospects.
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