Polymer modified graphene/polyvinylidene fluoride high-dielectric composite material and preparation method thereof

A technology of polyvinylidene fluoride and composite materials, applied in the field of composite materials, can solve problems such as difficult to meet and high dielectric loss factor, and achieve the effect of low dielectric loss factor and increased dielectric constant

A technology of polyvinylidene fluoride and composite materials, applied in the field of composite materials, can solve problems such as difficult to meet and high dielectric loss factor, and achieve the effect of low dielectric loss factor and increased dielectric constant

CN107618243AInactive Publication Date: 2018-01-23GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Polymer modified graphene/polyvinylidene fluoride high-dielectric composite material and preparation method thereof
  • Polymer modified graphene/polyvinylidene fluoride high-dielectric composite material and preparation method thereof
  • Polymer modified graphene/polyvinylidene fluoride high-dielectric composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this implementation, polyvinylidene fluoride-modified graphene was used as a dielectric functional filler to prepare a graphene / polyvinylidene fluoride composite material with a modified graphene content of 4 wt.%.

[0025] 1) Preparation of aminated graphene oxide

[0026] Disperse 2 grams of graphene oxide in a mixed solvent of 190 milliliters of absolute ethanol and 10 milliliters of water, and then add 0.2 grams of aminosilane KH550. After 30 minutes of ultrasonic mixing, the resulting solution is stirred and reacted at 60 degrees Celsius for 24 hours, and finally the reaction The obtained aminated graphene oxide was filtered, washed 6 times with distilled water, and dried under vacuum at 60° C. for 24 hours.

[0027] 2) Preparation of amino graphene

[0028] Disperse 2 grams of graphene oxide in 200 milliliters of distilled water and ultrasonically disperse it fully for 30 minutes, then slowly add 10 grams of sodium borohydride into the solution, and then heat ...

Embodiment 2

[0036] The preparation method and test method are the same as in Example 1, except that the graphene / polyvinylidene fluoride composite material with a polyvinylidene fluoride modified graphene content of 8wt.% is prepared, and the dielectric properties of the composite material at 1000 Hz are measured. The constant is 22.2 and the dielectric loss factor is 0.099.

Embodiment 3

[0038] The preparation method and test method are the same as in Example 1, except that the graphene / polyvinylidene fluoride composite material with a polyvinylidene fluoride modified graphene content of 12wt.% is prepared, and the dielectric properties of the composite material at 1000Hz are measured. The constant is 44.4 and the dielectric loss factor is 0.256.

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Abstract

The invention discloses a polymer modified graphene / polyvinylidene fluoride high-dielectric composite material and a preparation method thereof. The composite material is prepared by taking polyvinylidene fluoride as a matrix and taking graphene subjected to graft modification by aminosilane and polymer sequentially as dielectric enhancement functional filler through solution blending, electrostatic spinning and laminar hot-press molding sequentially. On the basis of dual regulation of interface and spatial microstructures, uniform dispersion of high-filling-volume graphene filler in the polyvinylidene fluoride matrix is effectively realized according to a graphene surface polymer grafting modification and electrostatic spinning combined method, and the dielectric constant of the obtainedgraphene / polyvinylidene fluoride composite material is evidently increased while a small dielectric dissipation factor is achieved, so that the polymer modified graphene / polyvinylidene fluoride high-dielectric composite material is applicable to fields of embedded capacitors, high-energy-density energy accumulators and the like.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a polymer-modified graphene / polyvinylidene fluoride high-dielectric composite material and a preparation method thereof. Background technique [0002] Although polymer materials have excellent mechanical properties, chemical stability and electrical insulation, their dielectric constant is low, generally below 10, which greatly limits their application range. In recent years, researchers have discovered that conductive filler / polymer composites with high dielectric constants can be obtained by adding conductive fillers to polymers. According to the percolation theory, when the content of conductive fillers is very close to the percolation threshold but not enough to form a conductive network, the conductive fillers are very close but still separated from each other, which is equivalent to introducing a large number of microcapacitor structures into the polymer matrix....

Claims

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Application Information

Patent Timeline
23 Jan 2018
Publication
CN107618243A
IPC
B32B27/32; B32B27/20; B32B9/00; B32B27/06; B32B9/04; B32B37/10; B32B37/06
Inventors
何富安; 黎增田