Polydimethylsiloxane/graphene flexible composite film with negative dielectric constant and preparation method thereof

A technology of polydimethylsiloxane and negative dielectric constant, which is applied in the field of polydimethylsiloxane/graphene flexible composite film and its preparation, can solve the problem of high dielectric loss, affecting the working performance of materials, and unfavorable Impedance matching and other issues, to achieve the effect of simple process

Active Publication Date: 2018-12-04
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since both carbon nanotubes and polypyrrole are conductive materials, after the two are combined, the dielectric loss of the material is too high, which is not conducive to impedance matching, which in turn affects the working performance of the material

Method used

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  • Polydimethylsiloxane/graphene flexible composite film with negative dielectric constant and preparation method thereof
  • Polydimethylsiloxane/graphene flexible composite film with negative dielectric constant and preparation method thereof
  • Polydimethylsiloxane/graphene flexible composite film with negative dielectric constant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 (the graphene massfraction that adds during preparation is 3%):

[0026] (1) Weigh the precursor of polydimethylsiloxane and curing agent according to the mass ratio of 10:1, wherein 2.5 grams of polydimethylsiloxane precursor and 0.25 grams of curing agent are placed in a beaker .

[0027] (2) Add 2.5 grams of n-heptane with the same mass as the precursor as a non-polar organic solvent, and perform magnetic stirring for 15 minutes to make it evenly mixed.

[0028] (3) weigh 0.162 grams of graphene, join in the above solution, carry out magnetic stirring for 30 minutes and carry out ultrasonic vibration treatment for 30 minutes, to reduce the agglomeration of graphene, obtain the mixture containing graphene and polydimethylsiloxane slurry.

[0029] (4) After the graphene is evenly dispersed in the solution, take an appropriate amount of mixed slurry and pour it on a smooth and clean glass plate, and use a scraper (that is, use the scraping film technology...

Embodiment 2

[0033] Embodiment 2 (the graphene massfraction that adds during preparation is 4%):

[0034] The difference between Example 2 and Example 1 is that the mass of graphene added in step (3) is 0.219 g, that is, the mass fraction of graphene added during preparation is 4%, and the other steps are the same. Such as figure 1 As shown, the dielectric constant of the polydimethylsiloxane / graphene flexible composite film prepared in Example 2 (4%) is negative.

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Abstract

The invention discloses a polydimethylsiloxane/graphene flexible composite film with a negative dielectric constant and a preparation method thereof. The preparation method comprises: uniformly mixinga polydimethylsiloxane precursor, a curing agent and a non-polar organic solvent, adding 3-4% of graphene into the solution, wherein the mass of the non-polar organic solvent is the same to that of the precursor, uniformly dispersing graphene in the solution to obtain mixed slurry, pouring the mixed slurry on a flat plate, uniformly coating the flat plate with the mixed slurry, and carrying out curing and peeling the coating to obtain the polydimethylsiloxane/graphene flexible composite film. The composite film has thickness of 0.1 to 2 mm. The flexible composite film has a negative dielectric constant, has the characteristics of simple process, low cost and easy mass production, and has an important application value in the fields of wearable devices, sensors, stealth cloaks and flexibleelectronic devices.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a polydimethylsiloxane / graphene flexible composite film with a negative dielectric constant and a preparation method thereof. Background technique [0002] The extraordinary electromagnetic medium with negative dielectric constant as the main performance characteristic has peculiar electromagnetic properties different from conventional materials, such as inverse Doppler effect, inverse Cherenkov effect and negative refraction effect. These novel properties make it have important research value and broad market prospects in the fields of electronic devices, microwave absorption and subwavelength imaging. [0003] The extraordinary electromagnetic properties with a negative dielectric constant were first obtained by constructing an artificial electromagnetic medium with a periodic array structure, and achieved by changing the shape, size and arrangement of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/04C08J5/18
CPCC08J5/18C08J2383/04C08K3/042
Inventor 孙凯董剑楠范润华信家豪冯帅解培涛王忠阳江倩
Owner SHANGHAI MARITIME UNIVERSITY
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