High-dielectric constant low-loss metal/polymer composite and preparation method thereof

A high dielectric constant and composite material technology, applied in the field of dielectric composite material preparation, can solve the problems of high loss and impracticality, and achieve the effects of stable performance, low cost, good frequency and temperature stability

Inactive Publication Date: 2012-10-03
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the relationship between the dielectric constant of this type of material and the filler content is very nonlinear. Only when the conductive filler content is sufficiently close to its percolation threshold will it show a high dielectric constant, and when the peak value of the dielectric constant is obtained, it often corresponds to a relatively high High loss (>0.1), so this kind of material is not yet practical

Method used

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  • High-dielectric constant low-loss metal/polymer composite and preparation method thereof
  • High-dielectric constant low-loss metal/polymer composite and preparation method thereof
  • High-dielectric constant low-loss metal/polymer composite and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] (1) At room temperature, 50 g of Al powder was ultrasonically dispersed and stirred to form a suspension in absolute ethanol, and then 0.5 g of coupling agent (γ-aminopropyltriethoxysilane) was added and stirred continuously for 10~ 30 minutes; then add deionized water, ultrasonically disperse and stir at 40-60°C for 15-60 minutes; centrifuge the powder, wash with absolute ethanol for 1-3 times, and then vacuum dry at 60-120°C for 2 ~5 hours, use after natural cooling to room temperature;

[0023] (2) Weigh 0.8333 g of the Al powder obtained by modifying the silane coupling agent in step (1); make its volume percentage in the composite material 10%, and weigh it according to the Al / DMAC weight ratio of 1 / 1 Corresponding to DMAC, ultrasonically disperse Al powder in DMAC to obtain dispersion a; weigh 4.9166 g of PVDF powder according to the polymer matrix PVDF volume percentage of 90%, and weigh DMAC according to the PVDF / DMAC weight ratio of 1 / 7, Dissolve PVDF in DMAC ...

Embodiment 2

[0026] (1) The surface treatment process of Al powder is with embodiment 1;

[0027] (2) Weigh 1.9212 g of the Al powder obtained by modifying the silane coupling agent in step (1); make its volume percentage in the composite material 20%, and weigh it according to the Al / DMAC weight ratio of 1 / 1 Corresponding to DMAC, ultrasonically disperse Al powder in DMAC to obtain dispersion a; weigh 5.0382 g of PVDF powder according to the polymer matrix PVDF volume percentage of 80%, and weigh DMAC according to the PVDF / DMAC weight ratio of 1 / 9, Dissolve PVDF in DMAC at 50°C, and cool to room temperature to obtain solution b; then mix dispersion a and solution b, and after ultrasonic dispersion for 10-30 minutes and magnetic stirring for 15-60 minutes, the mixture of Al and PVDF is obtained. Mix the suspension; cast the mixed suspension on a clean glass plate to form a film, and dry it in vacuum at 80 °C for 2 hours to obtain an Al / PVDF composite film.

[0028] (3) The dielectric consta...

Embodiment 3

[0030] (1) The surface treatment process of Al powder is the same as embodiment 1;

[0031] (2) Weigh 3.5103 g of the Al powder obtained by modifying the silane coupling agent in step (1); make its volume percentage in the composite material 30%, and weigh it according to the Al / DMAC weight ratio of 1 / 2 Corresponding to DMAC, ultrasonically disperse Al powder in DMAC to obtain dispersion a; weigh 5.3701 g of PVDF powder according to the polymer matrix PVDF volume percentage of 70%, and weigh DMAC according to the PVDF / DMAC weight ratio of 1 / 5, Dissolve PVDF in DMAC at 50°C, and cool to room temperature to obtain solution b; then mix dispersion a and solution b, and after ultrasonic dispersion for 10-30 minutes and magnetic stirring for 15-60 minutes, the mixture of Al and PVDF is obtained. Mix the suspension; cast the mixed suspension on a clean glass plate to form a film, and dry it in vacuum at 80 °C for 2 hours to obtain an Al / PVDF composite film.

[0032] (3) The dielectr...

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Abstract

The invention relates to a high-dielectric constant low-loss metal/polymer composite and a preparation method thereof. According to the invention, self-passivating metal Al powder with average particle size of 800 nm is treated by a silane coupling agent, then uniformly mixed with N, N-dimethylacetamide (DMAC) solution of polyvinylidene fluoride (PVDF) by magnetic stirring and ultrasonic dispersion, coated on clean glass plates to form films, and then dried in vacuum at 80 degrees centigrade for 2 h to remove solvent so as to obtain Al/PVDF composites with thickness of 30-80 microns; wherein dosage of Al is 10-50% of PVDF by volume percent. The Al/PVDF composite provided by the invention has a dielectric constant higher than 58 under a frequency of 1 kHz at room temperature, and a dielectric loss lower than 0.02; the dielectric constant is linearly increased along with increment of Al content, so that the dielectric constant can be randomly regulated within certain range according to the need; at the same time, the dielectric constant is good in temperature and frequency stability.

Description

technical field [0001] The invention belongs to the technical field of dielectric composite material preparation, and in particular relates to a high dielectric constant and low loss metal / polymer composite material with high dielectric constant, low loss, low composite temperature and simple preparation process and a preparation method thereof. Background technique [0002] In the field of dielectric materials, single-component materials are often difficult to meet the requirements of the modern electronics industry for the comprehensive performance of materials. For example, ferroelectric ceramics have excellent dielectric properties, and their dielectric constants are generally above 2000, but they require high-temperature sintering and are brittle; polymer materials have good processability, low molding temperature, good flexibility, and high dielectric strength, but their dielectric properties The electrical constant is generally low, generally between 2 and 10. For th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/10C08K9/06C08K3/08C08J5/18
Inventor 王法军余石金谭宗尚
Owner NANCHANG HANGKONG UNIVERSITY
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