PVDF-HFP/CB (poly(vinylidene fluoride-hexafluoropropylene)/carbon black) piezoelectric composite film and preparation method thereof

Abstract

The invention discloses a PVDF-HFP / CB (poly(vinylidene fluoride-hexafluoropropylene) / carbon black) piezoelectric composite film and a preparation method thereof. The piezoelectric composite film comprises PVDF-HFP and a carbon black particle, wherein 0.05-0.8 percent by weight of carbon black particle is added in a PVDF-HFP matrix. The preparation method comprises the steps: 1, mixing and stirring the carbon black particle with a solvent to prepare a turbid liquid, adding the PVDF-HFP to prepare a PVDF-HFP solution through stirring so that a mixture is fully mixed; 2, stirring the mixed solution for above 10 min in a planetary stirrer, defoaming for above 2 min; 3, pouring the solution on a hot aluminum plate, heating, removing the solvent to obtain a pre-crystallized film; 4, stretching the pre-crystallized film in a universal tester at a temperature of about 55-65 DEG C; and 5, performing step polarization on the film. The piezoelectric composite film has the advantages that the piezoelectric property index is remarkably increased in comparison with pure PVDF-HFP, when the content of the CB is 0.5 percent by weight, the standard open loop voltage is increased by about 1 time in comparison with the pure PVDF-HFP, the alternating current output power is increased by 3.6 times, and the direct current output power is increased by 4.6 times.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a PVDF-HFP / CB piezoelectric composite film and a preparation method of the film. Background technique [0002] Compared with piezoelectric ceramics, polyvinylidene fluoride (PVDF) has a relatively low piezoelectric constant, but it has the advantages of excellent flexibility, non-toxicity, recyclability, and acid corrosion resistance. Piezoelectric polymer materials for large-scale applications. [0003] PVDF is a semi-crystalline polymer material, and its crystal structure has at least four forms, namely α, β, γ, and δ. Among them, the α structure (monoclinic system) is the most common crystal form, and the β structure is the most important crystal form, because the content of the β phase and the direction of the dipole in the material determine the piezoelectric properties of the material. In order to obtain polymer materials with high β phase, adding na...

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Problems solved by technology

[0010] Due to the relatively low crystallinity of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), the piezoelectric performance is lower than that of PVDF. People are accustomed to using PVDF to make piezoelectric films, which hinders the application of PVDF-HFP materials in the field of piezoelectric technology. research applications

At present, there is no report on polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) copolymer piezoelectric film and its preparation method

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