Flexible PZT/PVDF composite piezoelectric aerogel material and preparation method thereof

Abstract

The invention discloses a flexible PZT / PVDF composite piezoelectric aerogel material and a preparation method thereof, and belongs to the technical field of piezoelectric materials. The preparation method comprises the following steps: respectively preparing PVDF sol and PZT sol, compounding the two components and further aging to form gel; carrying out drying treatment to obtain the composite piezoelectric aerogel material which takes flexible PVDF nanoflakes as a skeleton and has a nano-porous network structure by enabling PZT nano particles to grow on the PVDF nanoflakes and gathering. Thecomposite aerogel disclosed by the invention has extremely-low density due to a special microstructure; in addition, the density of the material can be adjusted by adjusting the porosity of the aerogel; meanwhile, because PVDF has good flexibility, the material shows the characteristics of high strength and good flexibility when the PVDF is used as a skeleton; besides, the PVDF is an organic piezoelectric material and has good piezoelectric properties when being compounded with the PZT, so that the application of piezoelectric aerogel materials in the field of underwater acoustic transducers is favorably promoted.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric materials, and in particular relates to a flexible PZT / PVDF composite piezoelectric electrogel material and a preparation method thereof. Background technique [0002] Lead zirconate titanate (PZT) is a typical trigonal-tetragonal perovskite ferroelectric ceramic with excellent piezoelectric and dielectric properties, which plays an important role in the modern electronics industry and is widely used as an acoustic transducer It is used in the field of underwater acoustic transducers and medical imaging diagnostic equipment. The hydrostatic figure of merit (HFOM) is a standard to measure whether a material is suitable for making acoustic transducers such as hydrophones, and the hydrostatic voltage coefficient (g h ) is often used to characterize the sensitivity of underwater acoustic transducers, while the hydrostatic pressure coefficient depends on the piezoelectric coefficient and dielect...

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Problems solved by technology

In this organic sol-gelation method, metal alkoxides are usually used as precursors, and metal alkoxides undergo rapid hydrolysis and polycondensation reactions when they meet water, which is very easy to generate precipitates and cannot exist in a sol state; at the same time, PZT is lead ( Pb), zirconium (Zr), titanium (T) ternary metal oxides, the hydrolysis and polycondensation conditions of each precursor are different, it is difficult to find out the conditions that satisfy the hydrolysis and polycondensation of the three precursors at the same time; the valence of Pb is divalent and the content More, it is difficult to form a firm three-dimensional network structure, which makes PZT airgel brittle

Therefore, so far, PZT airgel has rarely been reported, almost staying at the research level of the Peer team (Journal of Non-Crystalline Solids, 1995,186:59-63) in the 1990s

On the other hand, although the density of airgel can be considered to be the lowest among all solid materials, it is precisely because of its special microstructure that the skeleton structure is unstable, which makes the mechanical properties of airgel poor.

PZT airgel, like other aerogels, has poor strength, high brittleness, poor flexibility, poor agglomeration, and cannot maintain good interface integrity due to its high porosity. Due to these reasons, its intrinsic properties are also obvious. As a result, pure PZT airgel cannot be used in underwater acoustic transducers at all, which limits the development of PZT airgel materials in the field of underwater acoustic transducers to a large extent.

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