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Preparation method of high-dielectric-performance polymer-based composite microporous material

A technology of microporous materials and composite materials, which is applied in the field of preparation of polymer-based composite microporous materials with high dielectric properties. It can solve the problems of difficult control of the dielectric constant of composite materials, internal defects affecting the comprehensive performance of composite materials, and poor dispersion. , to achieve the effects of reduced cell size, low dielectric loss, and increased cell density

Active Publication Date: 2019-05-28
SHAANXI UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Benefits of technology

This patented technology describes making small particles called quantum dots or tiny crystals inside plastic materials like epoxy resin for use in electronic devices such as capacitor electrodes. These smaller particles have unique characteristics due to their dimensions being on an order of several tens of atoms wide compared to traditional metal ones. They are also highly resistant to damage from external forces caused during manufacturing processes. Overall, this new type of material provides improved performance over existing methods while reducing its own environmental concerns.

Problems solved by technology

This patented technical problem addressed by this patents relates to developing new types of compositions that combine both optical characteristics and electricity storing capabilities while maintaining durable mechanical strength over multiple uses cycles without losing any significant amount of stored power due to insufficient lightweightiness or fragility.

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  • Preparation method of high-dielectric-performance polymer-based composite microporous material
  • Preparation method of high-dielectric-performance polymer-based composite microporous material
  • Preparation method of high-dielectric-performance polymer-based composite microporous material

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[0027] A method for preparing a high dielectric performance polymer-based composite microporous material of the present invention, specifically comprising the following steps:

[0028] Step 1, use γ-aminopropyltriethoxysilane (AMEO) to modify the surface of hydroxylated multi-walled carbon nanotubes (MWCNT-OH), centrifuge wash and freeze-dry to obtain γ-aminopropyltriethoxy Modified multi-walled carbon nanotubes (AMEO-MWCNT) with base silane, dispersed the obtained AMEO-MWCNT in deionized water, added dropwise hydrochloric acid solution to adjust the pH to 4, and obtained positively charged AMEO-MWCNT (γ-aminopropyltri Ethoxysilane modified multi-walled carbon nanotube) aqueous dispersion;

[0029] Step 2, using the improved Hummers method to prepare graphene oxide (GO), dispersing the resulting GO into deionized water, and ultrasonically dispersing to obtain a negatively charged GO aqueous dispersion;

[0030] Step 3: Add the dispersion obtained in Step 1 and Step 2 into the...

Embodiment 1

[0036] The PEI / GO-e-MWCNT composite sheet with GO-e-MWCNT content of 0.5 wt% was placed in an autoclave, heated and fed with supercritical CO 2 fluid that makes CO 2 Diffuse into the PEI / GO-e-MWCNT composite sheet, the saturation temperature is 30°C, the saturation pressure is 10MPa, the saturation time is 12h, and a uniform composite / CO 2 Hybrid sheet, composite / CO 2 The mixed sheet was quickly transferred to a constant temperature silicone oil bath for foaming. The foaming temperature was 180°C, and the foaming time was 40s. Finally, it was placed in an ice-water bath to cool and shape to obtain polyetherimide / graphene oxide-wrapped carbon nanotubes. Composite microporous materials. Obtain the apparent density of gained composite microporous material after measurement is 950kg / m 3 , the cell size is 0.82 μm, and the cell density is 2.60×10 12 piece / cm 3 , the dielectric constant is 5.71, and the dielectric loss is 0.003.

Embodiment 2

[0038] A PEI / GO-e-MWCNT composite sheet with 2 wt% GO-e-CNT content was placed in an autoclave, heated and fed with supercritical CO 2 fluid that makes CO 2 Diffuse into the PEI / GO-e-MWCNT composite sheet, the saturation temperature is 50°C, the saturation pressure is 12MPa, the saturation time is 12h, and a uniform composite / CO 2 Mix sheets. Composites / CO 2 The mixed sheet was quickly transferred to a constant temperature silicone oil bath for foaming. The foaming temperature was 200°C and the foaming time was 25s. Finally, it is placed in an ice-water bath to cool and set the shape to obtain a polyetherimide / graphene oxide-wrapped carbon nanotube composite microporous material. The apparent density that obtains gained composite microporous material after measurement is 529kg / m 3 , the cell size is 0.96 μm, and the cell density is 4.33×10 12 piece / cm 3 , the dielectric constant is 10.62, and the dielectric loss is 0.032. The SEM image of the PEI / GO-e-MWCNT composite mi...

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Abstract

The invention discloses a preparation method of a high-dielectric-performance polymer-based composite microporous material. The preparation method concretely comprises the following processes of preparing a gamma-aminopropyltriethoxysilane modified multiwalled carbon nanotube water dispersion solution; using an improved Hummers method for preparing GO; dispersing the obtained GO into deionized water; performing ultrasonic dispersion to obtain a negatively charged GO water dispersion solution; preparing oxidized graphene coated multiwalled carbon nanotube solid powder; preparing polyetherimide/oxidized graphene coated multiwalled carbon nanotube composite sheet materials; preparing a composite material/CO2 mixed sheet material; taking out the composite material/CO2 mixed sheet material; transferring the material into a constant temperature silicon oil bath to be foamed at the foaming temperature being 180 to 220 DEG C for the foaming time of 5 to 60s; finally putting the materials intoan ice water bath to be cooled and shaped to obtain a finished product. The supercritical CO2 fluid is used as a physical foaming agent for introducing microporous structures into the composite material, so that the carbon nanometer material is oriented again to form a great amount of micro capacitance to improve the dielectric performance.

Description

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Claims

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Application Information

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Owner SHAANXI UNIV OF SCI & TECH
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