CN109608880A - A method of preparing high dielectric flexible film - Google Patents
A method of preparing high dielectric flexible film Download PDFInfo
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- CN109608880A CN109608880A CN201811533667.2A CN201811533667A CN109608880A CN 109608880 A CN109608880 A CN 109608880A CN 201811533667 A CN201811533667 A CN 201811533667A CN 109608880 A CN109608880 A CN 109608880A
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- 238000000034 method Methods 0.000 title description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 28
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 25
- 239000007788 liquid Substances 0.000 description 20
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 19
- 239000004205 dimethyl polysiloxane Substances 0.000 description 19
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 description 19
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 19
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 18
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 description 18
- 229910021389 graphene Inorganic materials 0.000 description 16
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 description 14
- 239000011521 glass Substances 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 10
- 235000019441 ethanol Nutrition 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 7
- 230000005684 electric field Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000002114 nanocomposite Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000008096 xylene Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 229920005573 silicon-containing polymer Polymers 0.000 description 4
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 239000012286 potassium permanganate Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- -1 oxygen atom Compound Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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Abstract
本发明涉及石墨烯材料的应用技术，具体为一种石墨烯/PDMS复合材料。本发明利用石墨烯和PDMS制备高介电柔性膜，包括石墨烯材料的制备、改性、与PDMS共混、外加电场等步骤。本发明制备的石墨烯/PDMS复合材料膜的介电常数显著提高，并且可以制备出任意厚度和大小的具有高介电的柔性膜。
The invention relates to an application technology of graphene materials, in particular to a graphene/PDMS composite material. The invention utilizes graphene and PDMS to prepare a high-dielectric flexible film, including the steps of preparing graphene material, modifying, blending with PDMS, applying electric field and the like. The dielectric constant of the graphene/PDMS composite material film prepared by the present invention is significantly improved, and a flexible film with high dielectric property of any thickness and size can be prepared.
Description
[technical field]
The present invention relates to flexible dielectric technical field, in particular to a kind of graphene-PDMS flexible dielectric and
Preparation method.
[background technique]
Graphene is a kind of new carbon, is only made of carbon, can with the allotrope each other such as diamond, C60
Directly to obtain from graphite surface, the source total amount of raw material is more, renewable and cheap.Nontoxic, the nothing of graphene
The features such as irritation, high rigidity (being 100 times of steel hardness), high thermal conductivity, low resistance, high electron mobility, bigger serface,
Cause extensive concern and the research of people.
Dimethyl silicone polymer (PDMS) is a kind of macromolecule that main chain is made of alternately arranged silicon atom and oxygen atom
Compound, side group and end group are mainly based on alkyl.PDMS generally has small thermal conductivity, surface tension, cold resistance and resistance to
The properties feature such as hot.Its existence form is divided to solid-state and two kinds of liquid, and the nontoxic presentation of the PDMS colorless and odorless of liquid is thick, glues
Degree varies with temperature small.
It can induce particle that the technology of orientations occurs early in twentieth century 80 using electromagnetic field as dynamic medium
Age is just by it has been found that this is because in extra electric field environment, since particle has different electricity from liquid medium itself
Conductance and dielectric constant can generate play the polarization mainly influenced to the particle in liquid medium after applying an electric field.At this
Under kind environment, particle can generate warm-up movement and electric field polarization effect is resisted, and when polarization can be greater than thermal energy, particle will form galvanic couple
Current potential jump occurs for layer, has eventually led to the orientations in the direction along electric field.
Therefore, the present invention by by graphene/dimethyl silicone polymer composite material plus high-voltage field feelings
It is heating and curing under condition, prepares a kind of high dielectric flexible film.
[summary of the invention]
The invention is intended to provide a kind of method for preparing high dielectric flexible film using graphene and PDMS, to increase background skill
The application range of substance is mentioned in art.To achieve the above object, following technical solution is proposed:
A kind of its preparation of high dielectric flexible film includes the following steps:
(1) prepared by graphene oxide: taking 2g graphite, 6g potassium permanganate, the 120ml concentrated sulfuric acid in reaction vessel, first 0
It is stirred to react 2 hours at DEG C with 400r/min, then is warming up to 50 DEG C with 600r/min heating stirring 6 hours, obtain having occurred pre-
The graphene of oxidation.Then product is subjected to centrifugally operated, centrifugation time 30min under conditions of 8000r/min, 20 DEG C.
(2) modified graphene oxide: configuration 2.5mg/mL graphene oxide (GO), a small amount of ammonia spirit tune PH are 8 or so.
Configure the ethanol solution of 7.5mg/ml octadecylamine.The ethanol solution of the mutual solvent octadecylamine (ODA) of previous step is poured into oxidation stone
In black alkene, return stirring is reacted for 24 hours at a high temperature of 90 DEG C.Hydration is added than the ratio that hydrazine hydrate is 400:1 then according to GO
Hydrazine the reaction was continued 4h.The ethanol solution of mixture heat after reaction is carried out after suction filtration cleans, place into vacuum drier
For 24 hours, products therefrom is the modified graphene of octadecylamine (G-ODA) for drying under 75 DEG C of high temperature.
(3) it prepares graphene/dimethyl silicone polymer composite material: G-ODA and dimethylbenzene is mixed and made into mass fraction
It is the xylene solution of 2/1000ths G-ODA, places into progress ultrasonic disperse 2h in ultrasonic machine, stands 30min and obtain uniformly
The dispersion liquid of dispersion.PDMS is taken to be uniformly mixed in non-medium homogenizer with dispersion liquid according to required concentration ratio, after uniform
Mixed liquor 80 DEG C at a temperature of heating 8-10h so that dimethylbenzene is therefrom volatilized.Add according to the ratio that curing agent and PDMS are 1:10
Enter curing agent and again with stirring deaeration under homogenizer again vacuum state, mixed liquor, that is, liquid form G-ODA/PDMS after deaeration
Nanocomposite.
(4) prepare high dielectric flexible film: using electro-conductive glass make needed for mold, opposite side stick conductive copper glue and
Insulating tape is fixed.The liquid of the G-ODA/PDMS nanocomposite of preparation is poured into after mould inside in upper surface pressure
Electro-conductive glass.Using oscillograph, D.C. regulated power supply, signal generator, extra electric field is generated, voltage is applied to sample, wherein
Frequency Of Signal Generator is 100Hz, amplitude 5V, waveform are dextrorotation wave.It allows sample to be placed on 80 DEG C at the same time, sample is carried out
Heating orientation solidification 30min, after to be solidified, takes out the 1mm thickness flexible membrane in mold.
[Detailed description of the invention]
Fig. 1 is the preparation method flow chart of high dielectric flexible film
Fig. 2 is graphene/PDMS composite membrane dielectric constant datagram that the embodiment of the present invention and comparative example provide
[specific embodiment]
Below in conjunction with this inventive embodiments to the technical solution in the present invention carry out it is detailed, clearly describe.But this
The protection scope of invention is not limited only to this, those skilled in the art according to the present invention in embodiment before no creative work
Putting other every other embodiments obtained all should be protection scope of the present invention.
The embodiment of the present invention is graphene to be prepared using oxidation-reduction method, and be compounded in high-voltage electricity with silicon rubber (PDMS)
High dielectric flexible film is prepared in the environment of, the specific steps are as follows:
(1) it prepares graphene oxide: taking 2g graphite, 6g potassium permanganate, the 120m l concentrated sulfuric acid in reaction vessel, exist first
It is stirred to react 2 hours, then is warming up at 50 DEG C with 600r/min heating stirring 6 hours with 400r/min at 0 DEG C, had occurred
The graphene of pre-oxidation.Then product is poured into and stands 10min in clear water, add H2O2It is stirred with glass bar to there is no gas
Bubble.Resulting mixture carries out centrifugally operated, centrifugation time 30min under conditions of 8000r/min, 20 DEG C.
(2) modified graphene oxide: graphite oxide (GO) is diluted to 2.5mg/mL, surveys its PH, then is molten with a small amount of ammonium hydroxide
Liquid will adjust PH 8 or so.Octadecylamine (ODA) and ethyl alcohol is taken to dissolve each other with the ratio of 1:1.By the mutual solvent octadecylamine of previous step
(ODA) ethanol solution pours into graphene oxide, reacts return stirring for 24 hours at a high temperature of 90 DEG C.Compare water then according to GO
It closes the ratio that hydrazine is 400:1 and hydrazine hydrate the reaction was continued 4h is added.The ethanol solution of mixture heat after reaction filter clear
After washing, places into vacuum drier and dried for 24 hours under 75 DEG C of high temperature, products therefrom is the modified graphene of octadecylamine
(G-ODA)。
(3) it prepares graphene/dimethyl silicone polymer composite material: G-ODA and dimethylbenzene is mixed and made into mass fraction
It is the xylene solution of 2/1000ths G-ODA, places into progress ultrasonic disperse 2h in ultrasonic machine, stands 30min and obtain uniformly
The dispersion liquid of dispersion.PDMS is taken to be uniformly mixed in non-medium homogenizer with dispersion liquid according to required concentration ratio, after uniform
Mixed liquor 80 DEG C at a temperature of heating 8-10h so that dimethylbenzene is therefrom volatilized.Add according to the ratio that curing agent and PDMS are 1:10
Enter curing agent and stirs deaeration under vacuum conditions with homogenizer again, mixed liquor, that is, liquid form G-ODA/PDMS after deaeration
Nanocomposite.
(4) prepare high dielectric flexible film: using electro-conductive glass make needed for mold, opposite side stick conductive copper glue and
Insulating tape is fixed.The liquid of the G-ODA/PDMS nanocomposite of preparation is poured into after mould inside in upper surface pressure
Electro-conductive glass.Using oscillograph, D.C. regulated power supply, signal generator, extra electric field is generated, voltage is applied to sample, wherein
Frequency Of Signal Generator is 100Hz, amplitude 5V, waveform are sine wave.It allows sample to be placed on 80 DEG C at the same time, sample is carried out
Heating orientation solidification 30min, after to be solidified, takes out the 1mm thickness flexible membrane in mold.
Embodiment 1.
Take the graphite powder 3g, potassium permanganate 9g, 98% concentrated sulfuric acid 180mL of 180 mesh in reaction vessel first, first 0
It is stirred to react 2 hours, then is warming up at 50 DEG C with 600r/min heating stirring 6 hours with 400r/min at DEG C, had occurred
The graphene of pre-oxidation.Then product is poured into and stands 10min in clear water, add 2ml H2O2It is stirred with glass bar to no longer
There is bubble.Resulting mixture carries out centrifugally operated, centrifugation time 30min under conditions of 8000r/min, 20 DEG C；Then
It takes graphene oxide (GO) 150mL to be diluted to 2.5mg/mL, surveys its PH, then PH will be adjusted 8 or so with a small amount of ammonia spirit.It takes
Octadecylamine 75mL (ODA) dissolves each other with 75mL ethyl alcohol.The ethanol solution of the mutual solvent octadecylamine (ODA) of previous step is poured into oxidation stone
In black alkene, return stirring is reacted for 24 hours at a high temperature of 90 DEG C.It is subsequently added into 0.375mL hydrazine hydrate.To mixture heat after reaction
Ethanol solution carry out suction filtration cleaning after, place into vacuum drier under 75 DEG C of high temperature it is dry for 24 hours, products therefrom is
The modified graphene of octadecylamine (G-ODA)；G-ODA and dimethylbenzene are mixed and made into the G-ODA that mass fraction is 2/1000ths
Xylene solution, take PDMS20 g, 2/1000ths G-ODA xylene solution 2mL mixing, be then placed in ultrasonic machine into
Row ultrasonic disperse 2h, stands 30min and obtains evenly dispersed dispersion liquid and be uniformly mixed in non-medium homogenizer, uniformly after it is mixed
Close liquid 80 DEG C at a temperature of heating 8-10h so that dimethylbenzene is therefrom volatilized.It is added according to the ratio that curing agent and PDMS are 1:10
Curing agent simultaneously stirs deaeration with homogenizer again under vacuum conditions, mixed liquor, that is, liquid form G-ODA/PDMS after deaeration
Nanocomposite；The mould having a size of 80 × 80 × 1mm is fabricated to using the electro-conductive glass that specification is 100 × 100 × 1mm
Tool, sticks conductive copper glue in opposite side and insulating tape is fixed.By the liquid of the G-ODA/PDMS nanocomposite of preparation
It pours into after mould inside and presses upper electro-conductive glass in upper surface.Using oscillograph, D.C. regulated power supply, signal generator, generate
Extra electric field applies voltage to sample, and wherein Frequency Of Signal Generator is 100Hz, amplitude 5V, waveform are sine wave.With this
It allows sample to be placed on 80 DEG C simultaneously, heating orientation solidification 30min is carried out to sample, after to be solidified, takes out the 1mm in mold
Thick flexible membrane.
Embodiment 2.
Material therefor type and process flow with embodiment 1, unlike the G-ODA of PDMS20g, 2/1000ths is added
Xylene solution 5mL.
Comparative example 1.
Material therefor type and dosage are with embodiment 1, the difference is that it is 100 × 100 × 1mm that mixing liquid, which is poured into specification,
Simple glass be fabricated in the mold having a size of 80 × 80 × 1mm, then press the common glass of upper same specification pair in upper surface
Glass heats 15min under 80 DEG C of environment to get the normal film of 1mm thickness is arrived.
Comparative example 2.
The similar embodiment 1 of material therefor kind, unlike be added PDMS20g, 2/1000ths G-ODA dimethylbenzene it is molten
Mixing liquid is poured into the simple glass that specification is 100 × 100 × 1mm and is fabricated to the mould having a size of 80 × 80 × 1mm by liquid 5mL
In tool, then in the simple glass of the upper same specification pair of upper surface pressure, 15min is heated under 80 DEG C of environment to get the general of 1mm thickness is arrived
Logical film.
Fig. 2 expression changes in PDMS and G-ODA different proportion dielectric constant with frequency.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit the invention, all in spirit of that invention and original
Within then, any modification, equivalent substitution, improvement and etc. done be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of high dielectric flexible film, which is characterized in that the film is a kind of graphene/PDMS composite material, and can be produced
The film of any thickness, and there is smooth surface texture, the graphene/PDMS composite material includes PDMS matrix and graphite
Alkene powder, the graphene powder are dispersed in the PDMS matrix, graphene in the graphene/PDMS composite membrane
Mass content is 0.02% to 0.2%.
2. graphene/PDMS composite material according to claim 1, it is characterised in that: in the graphene/PDMS composite membrane
The mass content of graphene is 0.02% to 0.2%.
3. graphene/PDMS composite material according to claim 1, it is characterised in that: the graphene/PDMS composite membrane is logical
Following method is crossed to obtain:
1) it prepares graphene oxide: taking 2g graphite, 6g potassium permanganate, the 120ml concentrated sulfuric acid in reaction vessel, first at 0 DEG C
It is stirred to react 2 hours, then is warming up at 50 DEG C with 600r/min heating stirring 6 hours with 400r/min, obtain that pre- oxygen has occurred
The graphene of change.Then product is poured into and stands 10min in clear water, add H2O2, stirred with glass bar to there is no bubbles.
Resulting mixture carries out centrifugally operated, centrifugation time 30min under conditions of 8000r/min and 20 DEG C；
2) modified graphene oxide: being diluted to 2.5mg/mL for graphite oxide (GO), surveys its PH, then with a small amount of ammonia spirit tune PH
8 or so.Configure the ethanol solution of 7.5mg/mL octadecylamine.The ethanol solution of the mutual solvent octadecylamine (ODA) of previous step is fallen
Enter in graphene oxide, volume ratio 1:2 reacts return stirring for 24 hours at a high temperature of 90 DEG C.It is than hydrazine hydrate then according to GO
Hydrazine hydrate is added the reaction was continued 4h in the volume ratio of 400:1.Suction filtration is carried out to the ethanol solution of mixture heat after reaction to clean
Afterwards, it places into vacuum drier and is dried for 24 hours under 75 DEG C of high temperature, products therefrom is the modified graphene (G- of octadecylamine
ODA)；
3) prepare graphene/dimethyl silicone polymer composite material: it is thousand points that G-ODA and dimethylbenzene, which are mixed and made into mass fraction,
Two G-ODA xylene solution, place into ultrasonic machine progress ultrasonic disperse 2h, stand 30min obtain it is evenly dispersed
Dispersion liquid.Take PDMS to be uniformly mixed in non-medium homogenizer with dispersion liquid according to required concentration ratio, uniformly after mixed liquor
80 DEG C at a temperature of heating 8-10h so that dimethylbenzene is therefrom volatilized.Solidification is added according to the ratio that curing agent and PDMS are 1:10
Agent simultaneously stirs deaeration with homogenizer again under vacuum conditions, the nanometer of mixed liquor, that is, liquid form G-ODA/PDMS after deaeration
Composite material；
4) prepare high dielectric flexible film: using ITO electro-conductive glass make needed for mold, opposite side stick conductive copper glue and absolutely
Edge adhesive tape is fixed.The liquid of the G-ODA/PDMS nanocomposite of preparation is poured into after mould inside and is led in upper surface pressure
Electric glass.Using oscillograph, D.C. regulated power supply, signal generator, extra electric field is generated, voltage is applied to sample, wherein believing
Number frequency generator is 100Hz, amplitude 5V, waveform are sine wave.It allows sample to be placed on 80 DEG C at the same time, sample is added
Heat orientation solidification 30min, after to be solidified, takes out the 1mm thickness flexible membrane in mold.
4. graphene/PDMS composite material according to claim 3, it is characterised in that: the graphene/PDMS composite membrane exists
3) after preparing graphene/PDMS composite material, material is solidified, solidification temperature is 70 to 90 DEG C.
5. graphene/PDMS composite material according to claim 3, it is characterised in that: the graphene/PDMS composite membrane exists
3) preparation means for using extra electric field after graphene/PDMS composite material to material, the signal generator frequency of electric field are prepared
Rate is 100Hz, amplitude 5V, waveform are dextrorotation wave.
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