A kind of PVDF-HFP/CB piezoelectric composite film and the preparation method of this film
A PVDF-HFP, composite film technology, applied in flat products, other household appliances, coatings, etc., can solve the problems of low crystallinity, hindering the research and application of PVDF-HFP materials, low piezoelectric performance, etc.
Inactive Publication Date: 2016-04-20
CHONGQING UNIV
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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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[0036] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0037] The PVDF-HFP / CB piezoelectric composite film of the present invention includes PVDF-HFP and carbon black particles, and the carbon black particles with a mass percentage of 0.05% to 0.8% are added to the PVDF-HFP matrix.
[0038] The preparation method of the present invention is:
[0039] Step 1. Make the DMF suspension of CB
[0040] Take an appropriate amount of CB particles (depending on the content requirements), put them in a plastic cup, add 24g of DMF solvent to the cup, and stir the DMF containing CB in ultrasonic waves for 15 minutes;
[0041] Step 2. Add 8gPVDF-HFP to the DMF suspension of CB, put the plastic cup containing the mixture into a planetary mixer and stir at a speed of 2000rpm, and then stir in an ultrasonic wave for 15 minutes;
[0042] Step 3. Stir the solution in a planetary mixer for another 10 minutes at a speed of 2000 rp...
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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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IPC IPC(8): C08L27/16C08K3/04C08J5/18B29C69/00B29C41/12B29C55/02B29L7/00
Inventor 胡宁吴良科宁慧铭
Owner CHONGQING UNIV