Preparation method of piezoelectric film based on PVDF-TrFE

Abstract

The invention relates to a preparation method of a PVDF-TrFE-based piezoelectric film, which comprises the following steps: KH-550 is used for modifying CNT powder, the modified CNT powder is dissolved in N-Dimethylformamide (DMF) solution, PVDF-TrFE is added after ultrasonic oscillation, then stirring is carried out till uniform stirring, PMN-PT powder is added, stirring is carried out, ultrasonic dispersion is carried out till uniform dispersion, the obtained composite solution is coated on a casting plate which is horizontally placed, the solution flows uniformly, then the casting plate is placed in an oven for drying, so that a dry casting film is obtained, hot press molding is carried out on the casting film, and the 0-0-3 type CNT / PVDF-TrFE / PMN-PT flexible composite piezoelectric film is obtained.The 0-0-3 type CNT / PVDF-TrFE / PMN-PT flexible composite piezoelectric film which has good flexibility and high piezoelectric property, and can be applied to medical ultrasonic probes, underwater acoustic transducers and the like.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a method for preparing a piezoelectric thin film based on PVDF-TrFE. Background technique [0002] Polymer / piezoelectric ceramic composite material is a combination of polymer and piezoelectric ceramic material with practical functions and practical significance; this composite material not only has good flexibility of polymer, but also can be The characteristics of processing, but also has the high voltage strain constant d of piezoelectric ceramics 33 , and high electromechanical coupling coefficient, while retaining the corresponding advantages of the two, it overcomes the shortcomings of the polymer’s weak piezoelectric properties and the brittleness of piezoelectric ceramics, and finally prepares a composite piezoelectric material with certain flexibility; As a new type of composite material, electrical composite materials have been widely used in underwater acoustics, u...

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Problems solved by technology

[0002] Polymer / piezoelectric ceramic composite material is a combination of polymer and piezoelectric ceramic material with practical functions and practical significance; this composite material not only has good flexibility of polymer, but also can be The characteristics of processing, but also has the high voltage strain constant d of piezoelectric ceramics 33 , and high electromechanical coupling coefficient, while retaining the corresponding advantages of the two, it overcomes the shortcomings of the polymer’s weak piezoelectric properties and the brittleness of piezoelectric ceramics, and finally prepares a composite piezoelectric material with certain flexibility; As a new type of composite material, electrical composite materials have been widely used in underwater acoustics, ultrasound, electroacoustics, medicine, etc., especially in medical ultrasonic probes and underwater acoustic transducers; Therefore, it has also attracted more and more research and attention; however, the current research on composite piezoelectric materials shows that the performance of composite piezoelectric materials prepared by simply mixing polymers and piezoelectric ceramic materials is not good. This type of composite piezoelectric material usually requires a very large polarization voltage. Even if the polarization voltage is large enough, there may be insufficient polarization of piezoelectric ceramics. Generally speaking, adding more dielectric Piezoelectric ceramics with a higher constant can reduce the polarization voltage; but for the preparation of flexible film materials, adding too much brittle piezoelectric ceramics will lead to a decrease in the flexibility of the composite material, while the advantages of the 0-3 type composite material It is to ensure the high piezoelectric performance of the composite material while ensuring the good flexibility of the composite material, so this solution is contradictory to the purpose of preparation

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