CN108275674A - A kind of super-elasticity graphene aerogel and preparation method thereof with pyroelectric effect - Google Patents
A kind of super-elasticity graphene aerogel and preparation method thereof with pyroelectric effect Download PDFInfo
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- CN108275674A CN108275674A CN201810105518.XA CN201810105518A CN108275674A CN 108275674 A CN108275674 A CN 108275674A CN 201810105518 A CN201810105518 A CN 201810105518A CN 108275674 A CN108275674 A CN 108275674A
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- C01B2204/00—Structure or properties of graphene
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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Abstract
The present invention relates to a kind of super-elasticity graphene aerogel and preparation method thereof with pyroelectric effect has twin-stage skeleton structure, and wherein level-one skeleton is polyurethane fiber network, and two level skeleton is the three-dimensional network being made of active thermoelectric material.Preparation method includes：By Sb2Te3Two-dimensional nano piece is disperseed in deionized water, stirring, and ultrasound obtains Sb2Te3Two-dimensional nano piece dispersion liquid；Graphite oxide is dispersed in dispersion liquid, is stirred, ultrasound obtains graphene oxide/Sb2Te3Two-dimensional nano piece composite dispersion liquid；Pretreated polyurethane foam is immersed in composite dispersion liquid, ultrasonic immersing absorption, freeze-drying obtains graphite oxide aerogel；Restored, it is washed, freeze-drying to get.The graphene aerogel of the present invention can convert the thermal energy in environment to electric energy, and the energy is provided for microelectronic component, with important application prospects in the wearable field such as medical monitoring, intelligent clothing.
Description
Technical field
The invention belongs to field of thermoelectric material technique, more particularly to a kind of super-elasticity graphene airsetting with pyroelectric effect
Glue and preparation method thereof.
Background technology
Thermoelectric material refers to a kind of functional material that can mutually convert thermal energy and electric energy.Thermoelectric material is in thermo-electric generation
There are boundless research and application prospect in terms of energization refrigeration, is mainly used in waste heat of automotive exhaust gas power generation, work at present
In industry heat recovery, deep space bathyscaphe and the electrical integrated system of solar energy highly effective photo-thermal.Thermoelectric material has will
Waste heat is converted into the characteristic of electric energy, is causing more and more to pay close attention to.So far, high conversion efficiency Bi2Te3Ceramics, flexibility
Conducting polymer thermo-electric device and a series of high conductivity carbon nanomaterial thermo-electric devices developed in succession.
With the development of intelligent wearable device, energy supply problem is at urgent problem to be solved.Compared to flexible solar electricity
Pond, thermoelectric material have the advantages that be not only restricted to external environment, therefore thermoelectric material especially elastic thermoelectric material is researched and developed
To very big concern.Thermal energy can be directly changed into electric energy to be that can wear by elastic thermoelectric material while conducting human heat
Wear equipment energy supply.However the problems such as flexible thermoelectric material generally existing transfer efficiency is not high at present and poor flexibility, therefore improve heat
The transfer efficiency of electric material and elasticity are extremely urgent.
Invention content
Technical problem to be solved by the invention is to provide a kind of super-elasticity graphene aerogel with pyroelectric effect and
Preparation method, super-elasticity graphene aerogel obtained, which can be realized, converts thermal energy into electric energy, the thermoelectricity with efficient stable
Transfer efficiency.
A kind of super-elasticity graphene aerogel with pyroelectric effect of the present invention has twin-stage skeleton structure, wherein one
Grade skeleton is polyurethane fiber network, and two level skeleton is the three-dimensional network being made of active thermoelectric material.
A kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect of the present invention, including：
(1) by Sb2Te3Two-dimensional nano piece is disperseed in deionized water, stirring, ultrasound, obtain a concentration of 1.00~
2.50mg/ml Sb2Te3Two-dimensional nano piece dispersion liquid；
(2) graphite oxide is dispersed in the dispersion liquid that step (1) obtains, is stirred, ultrasound, obtain a concentration of 10~
Graphene oxide/Sb of 25mg/ml2Te3Two-dimensional nano piece composite dispersion liquid；
(3) pretreated polyurethane foam is immersed in the composite dispersion liquid that step (2) obtains, carries out ultrasonic immersing suction
Attached, freeze-drying obtains graphite oxide aerogel；
(4) graphite oxide aerogel obtained to step (3) restores, washed, freeze-drying, obtains having heat
The super-elasticity graphene aerogel of electrical effect.
Stirring is magnetic agitation in the step (1), and the magnetic agitation time is 20~50min；Ultrasound is water bath sonicator, water
Bath ultrasonic time is 30~60min.
Stirring is magnetic agitation in the step (2), and the magnetic agitation time is 20~50min；Ultrasound is water bath sonicator, water
Bath ultrasonic time is 72~90h.
The process conditions of pretreatment polyurethane foam are in the step (3)：It is alternately washed respectively using deionized water, ethyl alcohol
It washs 2~5 times and dry.
The technological parameter of ultrasonic immersing absorption is in the step (3)：Dip time is 10~25min, and ultrasound intensity is
20~50W.
The technological parameter of freeze-drying is in the step (3)：Cryogenic temperature is -5~-196 DEG C, cooling time 0.1
~for 24 hours, freeze-drying vacuum degree is 5~20Pa, and sublimation drying is 48~84h.
The process conditions of reduction are in the step (4)：Using the ascorbic acid solution of a concentration of 30~75mg/ml, add
Heat is to 75~90 DEG C and keeps the temperature 10~25min, then carries out 1~4h of reduction to graphite oxide aerogel.
The process conditions of washing are in the step (4)：It is soaked in 2~5h in absolute ethyl alcohol, is washed repeatedly 2~5 times.
The technological parameter of freeze-drying is in the step (4)：Freeze-drying vacuum degree is 5~20Pa, when freeze-drying
Between be 48~84h.
The present invention is by changing Sb2Te3The concentration and water bath sonicator of two-dimensional nano piece and graphite oxide dispersion and freezing
The regulation and control to active thermoelectricity three-dimensional net structure inside super-elasticity graphene aerogel may be implemented in drying time.It is obtained
The graphene airsetting of the dual-gripper skeleton structure not only high conductivity with graphene, but also the porous knot of macropore with polyurethane foam
Structure has prodigious application prospect in flexible wearable self energizing equipment.
Super-elasticity graphene aerogel prepared by the present invention has higher conversion efficiency of thermoelectric, main reason is that stone
Black alkene has excellent conductivity, and the porous structure of foam, which is formed by multi phase interface again, reduces the thermal conductivity of graphene aerogel
Rate, the interior Sb filled of porous structure2Te3Two-dimensional nano piece enhances the conversion efficiency of thermoelectric of graphene aerogel again.
Advantageous effect
(1) present invention realizes the elastification of conventional thermoelectric materials, and the thermal energy capture for curved surface machinery, the confined space provides
Solution.
(2) the super-elasticity graphene aerogel prepared by the present invention has three-dimensional network porous structure, three-dimensional compared to other
Thermoelectric material, conversion efficiency of thermoelectric significantly improve.
(3) preparation process of the present invention is simple, environment friendly and pollution-free, is suitble to industrialized production, of low cost.
Description of the drawings
Fig. 1 is the digital photograph that super-elasticity graphene aerogel is sprung back under finger pressing in embodiment 1；Wherein from a left side to
The right side is followed successively by the graphene aerogel before pressing, graphene aerogel when pressing, the graphene aerogel after rebound.
Fig. 2 is the scanning electron microscope (SEM) photograph of super-elasticity graphene aerogel in embodiment 2；Wherein left figure is the graphite of porous structure
The scanning electron microscope (SEM) photograph of alkene aeroge, right figure are the scanning electron microscope (SEM) photograph of graphene coated polyurethane fiber.
Fig. 3 is Sb in embodiment 32Te3The scanning electron microscope (SEM) photograph of two-dimensional nano piece.
Fig. 4 be in embodiment 4 super-elasticity graphene aerogel generated when with temperature difference open-circuit voltage figure (on) and it is right
Answer temperature lift-down curve figure (under).
Specific implementation mode
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, people in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiment 1
(1) 100mg Sb are weighed2Te3Two-dimensional nano piece is scattered in 100ml deionized waters, magnetic agitation 20min, water-bath
Ultrasonic 30min obtains the Sb of a concentration of 1.00mg/ml2Te3Two-dimensional nano piece dispersion liquid.
(2) graphite oxide of 1.00g is weighed in the Sb for being scattered in step (1) and obtaining2Te3In two-dimensional nano piece dispersion liquid, magnetic
Power stirs 20min, water bath sonicator 72h, obtains uniform and stable graphene oxide/Sb of a concentration of 10mg/ml2Te3Two-dimensional nano
Piece composite dispersion liquid.
(3) polyurethane foam is subjected to pre-treatment, deionized water, ethyl alcohol is used to replace washing respectively 2 times and drying successively, with
Pretreated polyurethane foam is immersed into graphene oxide/Sb that step (2) obtains afterwards2Te3Two-dimensional nano piece composite dispersion liquid
In, ultrasonic immersing absorption is carried out, wherein dip time is 10min, and ultrasound intensity 20W then takes out, and will be adsorbed with oxidation stone
Black alkene/Sb2Te3The polyurethane foam of two-dimensional nano piece composite dispersion liquid, which is placed in -5 DEG C of environment, to be freezed for 24 hours, then rapidly will
Polyurethane foam after freezing is placed on from taking-up in liquid nitrogen in vacuum freeze drier, true under conditions of vacuum degree is 5Pa
Vacuum freecing-dry 48h, obtains graphite oxide aerogel.
(4) compound concentration is the ascorbic acid solution of 30mg/ml and is heated to 75 DEG C, and heat preservation 10min obtains step (3)
To graphite oxide aerogel be placed in above-mentioned 75 DEG C of ascorbic acid solution and restore 1h, be then soaked in absolute ethyl alcohol
2h is washed repeatedly 2 times, is subsequently placed in freeze drier and is dried, and wherein vacuum degree is 5Pa, and sublimation drying is
48h obtains the super-elasticity graphene aerogel with pyroelectric effect.
Graphene aerogel made from the present embodiment has twin-stage skeleton structure, and wherein level-one skeleton is polyurethane fiber net
Network, two level skeleton are the three-dimensional network being made of active thermoelectric material.
Fig. 1 is digital photograph of the super-elasticity graphene aerogel in finger by pressure, it can be seen that：Super-elasticity graphene gas
Gel presses pressure energetically finger, can be compressed to 20% height in itself；When release finger, super-elasticity graphene aerogel
Can in 5s momentary recovery be more than itself 98% height.It is non-that this shows that super-elasticity graphene aerogel prepared by this method has
The compression performance and resilience of Chang Youliang, and conductivity is constant after rebound.
To made from the present embodiment graphene aerogel carry out pyroelectric effect performance test, by test with calculate it is found that
The Seebeck value S=22 μ V/K of graphene aerogel in the present embodiment.
Embodiment 2
(1) 150mg Sb are weighed2Te3Two-dimensional nano piece is scattered in 100ml deionized waters, magnetic agitation 30min, water-bath
Ultrasonic 40min obtains the Sb of a concentration of 1.50mg/ml2Te3Two-dimensional nano piece dispersion liquid.
(2) graphite oxide of 1.50g is weighed in the Sb for being scattered in step (1) and obtaining2Te3In two-dimensional nano piece dispersion liquid, magnetic
Power stirs 30min, water bath sonicator 78h, obtains uniform and stable graphene oxide/Sb of a concentration of 15mg/ml2Te3Two-dimensional nano
Piece composite dispersion liquid.
(3) polyurethane foam is subjected to pre-treatment, deionized water, ethyl alcohol is used to replace washing respectively 3 times and drying successively, with
Pretreated polyurethane foam is immersed into graphene oxide/Sb that step (2) obtains afterwards2Te3Two-dimensional nano piece composite dispersion liquid
In, ultrasonic immersing absorption is carried out, wherein dip time is 15min, and ultrasound intensity 30W then takes out, and will be adsorbed with oxidation stone
Black alkene/Sb2Te3The polyurethane foam of two-dimensional nano piece composite dispersion liquid, which is placed in -60 DEG C of environment, freezes 16h, then rapidly will
Polyurethane foam after freezing is placed on from taking-up in liquid nitrogen in vacuum freeze drier, true under conditions of vacuum degree is 10Pa
Vacuum freecing-dry 60h, obtains graphite oxide aerogel.
(4) compound concentration is the ascorbic acid solution of 45mg/ml and is heated to 80 DEG C, and heat preservation 15min obtains step (3)
To graphite oxide aerogel be placed in reductase 12 h in above-mentioned 80 DEG C of ascorbic acid solution, be then soaked in absolute ethyl alcohol
3h is washed repeatedly 3 times, is subsequently placed in freeze drier and is dried, and wherein vacuum degree is 10Pa, and sublimation drying is
60h obtains the super-elasticity graphene aerogel with pyroelectric effect.
Graphene aerogel made from the present embodiment has twin-stage skeleton structure, and wherein level-one skeleton is polyurethane fiber net
Network, two level skeleton are the three-dimensional network being made of active thermoelectric material.
Fig. 2 is the scanning electron microscope (SEM) photograph (SEM) of super-elasticity graphene aerogel made from the present embodiment, it can be seen that：Left figure
Middle graphene sheet layer is embedded in the hole between polyurethane fiber, Sb2Te3Two-dimensional nano piece is then inserted in graphene as filler
Between lamella and embedded in graphene film layer surface；Graphene sheet layer is closely coated on polyurethane fiber surface in right figure, wherein
Sb2Te3Two-dimensional nano piece is filled between graphene sheet layer and polyurethane fiber.
Pyroelectric effect and elasticity performance test are carried out to graphene aerogel made from the present embodiment, pass through test and meter
Calculate it is found that graphene aerogel can be compressed to the 22% of height itself in the present embodiment, and can in 6s momentary recovery itself
The 97.6% of height；The Seebeck value S=24 μ V/K of graphene aerogel.
Embodiment 3
(1) 200mg Sb are weighed2Te3Two-dimensional nano piece is scattered in 100ml deionized waters, magnetic agitation 40min, water-bath
Ultrasonic 50min obtains the Sb of a concentration of 2.00mg/ml2Te3Two-dimensional nano piece dispersion liquid.
(2) graphite oxide of 2.00g is weighed in the Sb for being scattered in step (1) and obtaining2Te3In two-dimensional nano piece dispersion liquid, magnetic
Power stirs 40min, water bath sonicator 84h, obtains uniform and stable graphene oxide/Sb of a concentration of 20mg/ml2Te3Two-dimensional nano
Piece composite dispersion liquid.
(3) polyurethane foam is subjected to pre-treatment, deionized water, ethyl alcohol is used to replace washing respectively 4 times and drying successively, with
Pretreated polyurethane foam is immersed into graphene oxide/Sb that step (2) obtains afterwards2Te3Two-dimensional nano piece composite dispersion liquid
In, ultrasonic immersing absorption is carried out, wherein dip time is 20min, and ultrasound intensity 40W then takes out, and will be adsorbed with oxidation stone
Black alkene/Sb2Te3The polyurethane foam of two-dimensional nano piece composite dispersion liquid, which is placed in -120 DEG C of environment, freezes 8h, then rapidly will
Polyurethane foam after freezing is placed on from taking-up in liquid nitrogen in vacuum freeze drier, true under conditions of vacuum degree is 15Pa
Vacuum freecing-dry 72h, obtains graphite oxide aerogel.
(4) compound concentration is the ascorbic acid solution of 60mg/ml and is heated to 85 DEG C, and heat preservation 20min obtains step (3)
To graphite oxide aerogel be placed in above-mentioned 85 DEG C of ascorbic acid solution and restore 3h, be then soaked in absolute ethyl alcohol
4h is washed repeatedly 4 times, is subsequently placed in freeze drier and is dried, and wherein vacuum degree is 15Pa, and sublimation drying is
72h obtains the super-elasticity graphene aerogel with pyroelectric effect.
Graphene aerogel made from the present embodiment has twin-stage skeleton structure, and wherein level-one skeleton is polyurethane fiber net
Network, two level skeleton are the three-dimensional network being made of active thermoelectric material.
Fig. 3 is Sb in the present embodiment2Te3The electron microscope (SEM) of two-dimensional nano piece, it can be seen that：Sb2Te3Two-dimensional nano piece
For class regular hexagon structure.
Pyroelectric effect and elasticity performance test are carried out to graphene aerogel made from the present embodiment, pass through test and meter
Calculate it is found that graphene aerogel can be compressed to the 24% of height itself in the present embodiment, and can in 7s momentary recovery itself
The 97.2% of height；The Seebeck value S=26 μ V/K of graphene aerogel.
Embodiment 4
(1) 250mg Sb are weighed2Te3Two-dimensional nano piece is scattered in 100ml deionized waters, magnetic agitation 50min, water-bath
Ultrasonic 60min obtains the Sb of a concentration of 2.50mg/ml2Te3Two-dimensional nano piece dispersion liquid.
(2) graphite oxide of 2.50g is weighed in the Sb for being scattered in step (1) and obtaining2Te3In two-dimensional nano piece dispersion liquid, magnetic
Power stirs 50min, water bath sonicator 90h, obtains uniform and stable graphene oxide/Sb of a concentration of 25mg/ml2Te3Two-dimensional nano
Piece composite dispersion liquid.
(3) polyurethane foam is subjected to pre-treatment, deionized water, ethyl alcohol is used to replace washing respectively 5 times and drying successively, with
Pretreated polyurethane foam is immersed into graphene oxide/Sb that step (2) obtains afterwards2Te3Two-dimensional nano piece composite dispersion liquid
In, ultrasonic immersing absorption is carried out, wherein dip time is 25min, and ultrasound intensity 50W then takes out, and will be adsorbed with oxidation stone
Black alkene/Sb2Te3The polyurethane foam of two-dimensional nano piece composite dispersion liquid, which is placed in -196 DEG C of environment, freezes 0.1h, then rapidly
Polyurethane foam after freezing is placed on from taking-up in liquid nitrogen in vacuum freeze drier, under conditions of vacuum degree is 20Pa
Vacuum freeze drying 84h, obtains graphite oxide aerogel.
(4) compound concentration is the ascorbic acid solution of 75mg/ml and is heated to 90 DEG C, and heat preservation 25min obtains step (3)
To graphite oxide aerogel be placed in above-mentioned 90 DEG C of ascorbic acid solution and restore 3h, be then soaked in absolute ethyl alcohol
5h is washed repeatedly 5 times, is subsequently placed in freeze drier and is dried, and wherein vacuum degree is 20Pa, and sublimation drying is
84h obtains the super-elasticity graphene aerogel with pyroelectric effect.
Graphene aerogel made from the present embodiment has twin-stage skeleton structure, and wherein level-one skeleton is polyurethane fiber net
Network, two level skeleton are the three-dimensional network being made of active thermoelectric material.
Fig. 4 be the present embodiment made from super-elasticity graphene aerogel generated when with temperature difference open-circuit voltage figure (on)
And corresponding temperature lift-down curve (under), it can be seen that：In corresponding heating and cooling, open circuit produced by super-elasticity graphene aerogel
Voltage increases with temperature difference and is increased, and it is 28 μ V/K that SeeBeck values, which are calculated,.
Elasticity performance test is carried out to graphene aerogel made from the present embodiment, by test with calculating it is found that this reality
The 26% of height itself can be compressed to by applying graphene aerogel in example, and can in 8s momentary recovery height itself
97.0%.
Claims (10)
1. a kind of super-elasticity graphene aerogel with pyroelectric effect, it is characterised in that：With twin-stage skeleton structure, wherein one
Grade skeleton is polyurethane fiber network, and two level skeleton is the three-dimensional network being made of active thermoelectric material.
2. a kind of preparation method of the super-elasticity graphene aerogel as described in claim 1 with pyroelectric effect, including：
(1) by Sb2Te3Two-dimensional nano piece is disperseed in deionized water, stirring, and ultrasound obtains a concentration of 1.00~2.50mg/ml
Sb2Te3Two-dimensional nano piece dispersion liquid；
(2) graphite oxide is dispersed in the dispersion liquid that step (1) obtains, is stirred, ultrasound obtains a concentration of 10~25mg/ml
Graphene oxide/Sb2Te3Two-dimensional nano piece composite dispersion liquid；
(3) pretreated polyurethane foam is immersed in the composite dispersion liquid that step (2) obtains, carries out ultrasonic immersing absorption,
Freeze-drying, obtains graphite oxide aerogel；
(4) graphite oxide aerogel obtained to step (3) restores, washed, and freeze-drying is obtained with thermoelectricity effect
The super-elasticity graphene aerogel answered.
3. a kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect according to claim 2, special
Sign is：Stirring is magnetic agitation in the step (1), and the magnetic agitation time is 20~50min；Ultrasound is water bath sonicator, water
Bath ultrasonic time is 30~60min.
4. a kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect according to claim 2, special
Sign is：Stirring is magnetic agitation in the step (2), and the magnetic agitation time is 20~50min；Ultrasound is water bath sonicator, water
Bath ultrasonic time is 72~90h.
5. a kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect according to claim 2, special
Sign is：The process conditions of pretreatment polyurethane foam are in the step (3)：It is alternately washed respectively using deionized water, ethyl alcohol
It washs 2~5 times and dry.
6. a kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect according to claim 2, special
Sign is：The technological parameter of ultrasonic immersing absorption is in the step (3)：Dip time is 10~25min, ultrasound intensity 20
~50W.
7. a kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect according to claim 2, special
Sign is：The technological parameter of freeze-drying is in the step (3)：Cryogenic temperature be -5~-196 DEG C, cooling time be 0.1~
For 24 hours, freeze-drying vacuum degree is 5~20Pa, and sublimation drying is 48~84h.
8. a kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect according to claim 2, special
Sign is：The process conditions of reduction are in the step (4)：Using the ascorbic acid solution of a concentration of 30~75mg/ml, heating
To 75~90 DEG C and 10~25min is kept the temperature, 1~4h of reduction then is carried out to graphite oxide aerogel.
9. a kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect according to claim 2, special
Sign is：The process conditions of washing are in the step (4)：It is soaked in 2~5h in absolute ethyl alcohol, is washed repeatedly 2~5 times.
10. a kind of preparation method of super-elasticity graphene aerogel with pyroelectric effect according to claim 2, special
Sign is：The technological parameter of freeze-drying is in the step (4)：Freeze-drying vacuum degree is 5~20Pa, sublimation drying
For 48~84h.
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Cited By (3)
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| CN109659540A (en) * | 2018-12-21 | 2019-04-19 | 合肥工业大学 | A kind of preparation method of porous carbon coating antimony telluride nanometer sheet and its application as metal ion cell negative electrode material |
| CN111616553A (en) * | 2020-06-04 | 2020-09-04 | 和也健康科技有限公司 | Antibacterial mite-killing magnetic comprehensive function mattress |
| CN115650215A (en) * | 2022-10-27 | 2023-01-31 | 厦门伟然新碳科技有限公司 | Preparation method of high-elasticity waterborne polyurethane/graphene aerogel |
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| WO2017060719A1 (en) * | 2015-10-08 | 2017-04-13 | The University Of Manchester | Aerogels |
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| US8852444B2 (en) * | 2009-08-14 | 2014-10-07 | Northwestern University | Sorting two-dimensional nanomaterials by thickness |
| CN102760827A (en) * | 2012-07-23 | 2012-10-31 | 浙江大学 | Bi2Te3 thin-piece/graphene composite material, preparation method and applications thereof |
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| CN109659540A (en) * | 2018-12-21 | 2019-04-19 | 合肥工业大学 | A kind of preparation method of porous carbon coating antimony telluride nanometer sheet and its application as metal ion cell negative electrode material |
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| CN111616553A (en) * | 2020-06-04 | 2020-09-04 | 和也健康科技有限公司 | Antibacterial mite-killing magnetic comprehensive function mattress |
| CN115650215A (en) * | 2022-10-27 | 2023-01-31 | 厦门伟然新碳科技有限公司 | Preparation method of high-elasticity waterborne polyurethane/graphene aerogel |
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