CN110004712A - A kind of preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber - Google Patents
A kind of preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber Download PDFInfo
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Abstract
The preparation method of the invention discloses a kind of high-intensitive heat conducting film based on Kevlar nanofiber, it is characterized in that, using the boron nitride nanosheet of urea functionalization and the Kevlar nanofiber of functionalization as membrane material assembly, self assembly, which is filtered, by decompression obtains boron nitride nanosheet/functionalization Kevlar nanofiber composite film first, then its heating conduction and mechanical performance are improved by glutaraldehyde cross-linking, boron nitride nanosheet/functionalization Kevlar nanofiber composite membrane is obtained, i.e., based on the heat conducting film of Kevlar nanofiber.The present invention is assembly using the modified Kevlar nanofiber of the boron nitride nanosheet of functionalization and surface, the chemical crosslinking structure of boron nitride nanosheet and Kevlar nanofiber is realized by glutaraldehyde cross-linking, the significant increase tensile strength of compound film material, assign composite membrane excellent heating conduction simultaneously, this method is simple, effective, and high intensity heat conducting film obtained is expected to be used for for fields such as the energy, electronics.
Description
Technical field
The present invention relates to a kind of preparation methods of nanocomposite, and in particular to a kind of based on Kevlar nanofiber
The preparation method of high-intensitive heat conducting film.
Background technique
It is strong providing as contemporary electronic technology rapidly develops and the continuous improvement of the degree of integration of electronic component
While big use function, increased dramatically for its operating power consumption and calorific value is also resulted in.High temperature will be to electronic component
Stability, reliability and service life generate harmful influence.Thereby, it is ensured that heat caused by heating electronic component can and
When discharge, have become an importance of microelectronic product system assembles, and all for degree of integration and packing density
Higher portable electronic product, heat dissipation even become the technical bottleneck problem of entire product.
Kevlar is the high macroscopic fibres of the tensile strength that is synthesized by p-aramid fiber, the length of the Kev bracing wire of reticular structure
Strand is made of poly(p-phenylene terephthalamide) (PPTA), and the key that interchain is formed makes this material have high intensity
And thermal stability: tensile strength is about 3.6GPa.This density of material is low, intensity is high, good toughness, high temperature resistant, it is easy to process and
Molding, intensity is 5 times of equal quality steel, but density is only 1/5th of steel, therefore is valued by people.Though
So macroscopic view Kevlar has a wide range of applications at many aspects, but the status of Kevlar macroscopic view limits it in the composite
Potential application.In fact, the polymer of Nano grade is contained in macroscopical Kevlar, the ammonia through analyzing, on different amide groups
Interchain hydrogen bond can be formed between base and carbonyl, in addition to this, the Π-Π conjugation between phenyl ring attracts each other.Therefore want system
Standby Kevlar nanofiber needs two kinds of power of saboteur.After searching and discovering the prior art, macroscopical Kafra fiber is added
Enter into the solution system of dimethyl sulfoxide and potassium hydroxide, weakens intermolecular strong hydrogen bond using the process of protonation, it will
The Kafra fiber of macroscopic view tears into Kevlar nanofiber, provides for the application of Kafra fiber on the composite important
Method.
Boron nitride becomes a kind of heat filling having many uses due to its high thermal conductivity and good insulating properties.As
The isoelectronic species of graphene, the hexagon bi-dimensional cellular shape lattice knot that boron nitride is made of alternate B and N atom sp2 hydridization
Structure.Since its structure is similar with graphene, many excellent performances are likewise supplied with, thus also by favor.Such as boron nitride table
Reveal good mechanical performance, high thermal stability and high-termal conductivity etc..Therefore, it is anticipated that this intrinsic height of boron nitride
Thermal coefficient and mechanical strength will significantly improve the heating conduction and mechanical performance of composite material, but largely experimental result table
As the bright fact is not prediction.Filler is mainly derived from good point in the polymer of filler to the promotion of polymer performance
The scattered and interaction between polymeric matrix.Therefore, usually the surface of BNNS is modified, enhances itself and polymer matrix
Interaction between body.By the compound system of the Kevlar nanofiber of the boron nitride nanosheet of urea functionalization and phosphoric acid functionalized
Standby nanocomposite, can improve significantly the comprehensive performance of composite material, while assigning composite material new property
Energy and characteristic.
Summary of the invention
The technical problems to be solved by the present invention are: how to utilize the spy of Kevlar nanofiber and functionalization boron nitride
Property, solve the heat dissipation problem of electronic component.
To solve the above-mentioned problems, the system of the present invention provides a kind of high-intensitive heat conducting film based on Kevlar nanofiber
Preparation Method, which is characterized in that using the boron nitride nanosheet of urea functionalization and the Kevlar nanofiber conduct of functionalization
Membrane material assembly filters self assembly by decompression and obtains boron nitride nanosheet/functionalization Kevlar nanofiber THIN COMPOSITE first
Film then improves its heating conduction and mechanical performance by glutaraldehyde cross-linking, obtains boron nitride nanosheet/functionalization Kev Rana
Rice composite fiber membrane, i.e., based on the heat conducting film of Kevlar nanofiber.
Preferably, above-mentioned preparation method the following steps are included:
Step 1): boron nitride powder is calcined into 2~4h in 800~1000 DEG C of nitrogen furnace；
Step 2): boron nitride powder after calcined and urea 3~6h of frit reaction in a nitrogen atmosphere；
Step 3): after the reaction was completed, in deionized water by the dispersion of obtained solid, after ultrasound removing, centrifugation, filtering is received
Collection, washing, dry, the boron nitride nanosheet of acquisition urea functionalization；
Step 4): Kevlar and potassium hydroxide are dissolved in dimethyl sulfoxide solvent, are stirred to react 7 at 20~40 DEG C
~10 days, obtain Kevlar nanofiber/dimethyl sulfoxide dispersion liquid；
Step 5): in Kevlar nanofiber/dimethyl sulfoxide dispersion liquid, being added phosphoric acid and deionized water, 90~
5~6h of reaction is hydrolyzed at 110 DEG C；
Step 6): after the reaction was completed, product being centrifuged and is washed, remove remaining dimethyl sulfoxide, be then dispersed in from
In sub- water, Kevlar nanofiber/aqueous dispersions are obtained；
Step 7): boron nitride nanosheet aqueous dispersions are added in Kevlar nanofiber/aqueous dispersions, and stirring is adopted
Boron nitride nanosheet/Kevlar nanofiber composite film is made with vacuum filtration method, is dried in vacuo；
Step 8): the laminated film after drying being immersed in glutaraldehyde solution and is chemically crosslinked, and is taken out after reaction dry
It is dry, boron nitride nanosheet/functionalization Kevlar nanofiber composite membrane is obtained, i.e., based on the heat conducting film of Kevlar nanofiber.
It is highly preferred that boron nitride powder with 2~5 DEG C/min is increased to 800~1000 DEG C in the step 1), and keep 2
~4h.
It is highly preferred that the mass ratio of boron nitride powder and urea is 1:5~1:7, the temperature of frit reaction in the step 2)
Degree is 130~140 DEG C.
It is highly preferred that the time of ultrasound removing is 8~12h in the step 3)；The speed of centrifugation be 3000~
10~20min of 4000rpm, Shi Changwei；Drying temperature is 60~80 DEG C, and drying time is 12~48h.
It is highly preferred that the mass ratio of Kevlar and potassium hydroxide is (0.2~2): (0.5~3) in the step 4)；It is triumphant
The mass volume ratio of Fu La and dimethyl sulfoxide is (0.2~2) g:(100~1000) mL.
It is highly preferred that taking Kevlar nanofiber/dimethyl sulfoxide dispersion liquid, phosphoric acid, deionized water in the step 5)
Volume ratio be (50~200): (1.25~5): (2.5~10).
It is highly preferred that the mass concentration of the phosphoric acid is not less than 85%.
It is highly preferred that drying temperature is 60~80 DEG C in the step 7), drying time is 12~48h.
It is highly preferred that the mass concentration of glutaraldehyde solution is 50% in the step 8), dosage is laminated film submergence
In glutaraldehyde solution.
By the present invention in that handling Kafra fiber with phosphoric acid functionalized, the active nano grade aramid fiber knot of different shape is prepared
Structure unit is further filled with urea-modified boron nitride nanosheet and assembles them into laminated film, using mutual hydrogen bond action,
Boron nitride nanosheet/Kevlar nanofiber floccule is obtained, after filtering film forming drying, is steeped in glutaraldehyde solution.Phosphoric acid is used
In the high aspect ratio Kafra fiber that hydrolysis is dispersed in dimethyl sulphoxide solution, and make them that there is chemical reactivity.Then
It is polymerize again by the aromatic polyamides nanostructure that the condensation reaction with glutaraldehyde hydrolyzes these, obtains the high mechanicalness of high thermal conductivity
Boron nitride nanosheet/functionalization Kevlar nanofiber composite membrane of energy.
Compared with prior art, the present invention Kevlar nanometer modified using the boron nitride nanosheet of functionalization and surface
Fiber is assembly, and the chemical crosslinking structure of boron nitride nanosheet and Kevlar nanofiber, pole are realized by glutaraldehyde cross-linking
The tensile strength of compound film material is improved greatly, while assigning composite membrane excellent heating conduction, this method is simple, effective, is made
High-intensitive heat conducting film be expected to be used for for the fields such as the energy, electronics.
Detailed description of the invention
Fig. 1 is the flow chart of preparation method provided by the invention；
Fig. 2 is the comparison diagram of the SEM figure of boron nitride nanosheet obtained in commercially available boron nitride and embodiment 1；
Fig. 3 schemes for the TEM of boron nitride nanosheet obtained in embodiment 2-4；
Fig. 4 is boron nitride nanosheet/functionalization Kevlar nanofiber composite film section made from embodiment 2-4
The comparison diagram of SEM figure；
Fig. 5 is that boron nitride nanosheet/functionalization Kevlar nanofiber composite film stress made from embodiment 1-4 is answered
Varied curve figure；
Fig. 6 is the thermally conductive system of boron nitride nanosheet/functionalization Kevlar nanofiber composite film made from embodiment 1-4
Number curve figure.
Specific embodiment
In order to make the present invention more obvious and understandable, hereby with preferred embodiment, and attached drawing is cooperated to be described in detail below.
Embodiment 1
A kind of preparation method of pure function Kevlar nano thin-film, the specific steps are as follows:
(1) 1g Kevlar and 1.5g potassium hydroxide are dissolved in 500mL dimethyl sulfoxide solvent, water-bath at 40~80 DEG C
Heating stirs one week, obtains Kevlar nanofiber/dimethyl sulfoxide dispersion liquid；
(2) it takes 50mL Kevlar nanofiber/dimethyl sulfoxide dispersion liquid, is added 2.5mL phosphoric acid, 5mL deionized water,
5h is reacted at 90~110 DEG C；
(3) centrifuge washing removes dimethyl sulfoxide, and dispersion is in deionized water；
(4) it is 50mm, organic nylon leaching film that aperture is 0.45 μm, vacuum filtration, obtained boron nitride that filter membrane, which selects diameter,
Nanometer sheet/Kevlar nanofiber composite film, 80 DEG C of dryings are for 24 hours；
(5) it takes out, is immersed in the glutaraldehyde solution of 3.5mL 50% after drying, at 70 DEG C, 40min, as functionalization
Kevlar nanofiber film.
Embodiment 2
A kind of preparation method of the laminated film containing 5wt% boron nitride nanosheet, the specific steps are as follows:
(1) boron nitride powder is calcined into 3h under nitrogen gas in 1000 DEG C of tube furnaces；
(2) boron nitride powder and 6g urea after taking 1g calcined are set in a round bottom flask, under nitrogen gas, oil bath heating
To 130 DEG C~140 DEG C progress frit reaction 4h；
(3) after the reaction was completed, solid is dispersed in 500mL deionized water, ultrasound 8~12h of removing, is surpassed in the present embodiment
Then dispersion liquid is centrifuged min under 3000rpm revolving speed, obtains supernatant by sonication 10h；By supernatant liquid filtering, and spend from
Sub- water washing, wherein the method filtered preferably filters, by the solid being collected into, dry 10h obtains urea functionalization at 65 DEG C
Boron nitride nanosheet；
(4) 1g Kevlar and 1.5g potassium hydroxide are dissolved in 500mL dimethyl sulfoxide solvent, water-bath adds at 60 DEG C
Heat stirs one week, obtains Kevlar nanofiber/dimethyl sulfoxide dispersion liquid；
(5) it takes 50mL Kevlar nanofiber/dimethyl sulfoxide dispersion liquid, is added 2.5mL phosphoric acid, 5mL deionized water,
5h is reacted at 90~110 DEG C；
(6) centrifuge washing removes dimethyl sulfoxide, disperses in deionized water, as Kevlar nanofiber/water dispersion
Liquid；
(7) boron nitride nanosheet of 5.2mg is taken to disperse in deionized water, to be added to Kevlar nanofiber/water dispersion
In liquid；
(8) it is 50mm, organic nylon leaching film that aperture is 0.45 μm, vacuum filtration, obtained boron nitride that filter membrane, which selects diameter,
Nanometer sheet/Kevlar nanofiber composite film, 80 DEG C of dryings are for 24 hours；
(9) it takes out, is immersed in the glutaraldehyde solution of 3.5mL 50% after drying, at 70 DEG C, 40min, as high thermal conductivity
The boron nitride nanosheet of high-mechanical property/functionalization Kevlar nanofiber composite membrane.
Embodiment 3
A kind of preparation method of the laminated film containing 10wt% boron nitride nanosheet, the specific steps are as follows:
(1) boron nitride powder is calcined into 3h under nitrogen gas in 1000 DEG C of tube furnaces；
(2) boron nitride powder and 6g urea after taking 1g calcined are set in a round bottom flask, under nitrogen gas, oil bath heating
To 130 DEG C~140 DEG C progress frit reaction 4h；
(3) after the reaction was completed, solid is dispersed in 500mL deionized water, ultrasound 8~12h of removing, is surpassed in the present embodiment
Then dispersion liquid is centrifuged 10min under 3000rpm revolving speed, obtains supernatant by sonication 10h；By supernatant liquid filtering, and spend
Ion water washing, wherein the method filtered preferably filters, by the solid being collected into, dry 10h obtains urea function at 65 DEG C
The boron nitride nanosheet of change；
(4) 1g Kevlar and 1.5g potassium hydroxide are dissolved in 500mL dimethyl sulfoxide solvent, water-bath adds at 60 DEG C
Heat stirs one week, obtains Kevlar nanofiber/dimethyl sulfoxide dispersion liquid；
(5) it takes 50mL Kevlar nanofiber/dimethyl sulfoxide dispersion liquid, is added 2.5mL phosphoric acid, 5mL deionized water,
5h is reacted at 90~110 DEG C；
(6) centrifuge washing removes dimethyl sulfoxide, disperses in deionized water, as Kevlar nanofiber/water dispersion
Liquid；
(7) boron nitride nanosheet of 11.2mg is taken to disperse in deionized water, to be added to Kevlar nanofiber/water dispersion
In liquid；
(8) it is 50mm, organic nylon leaching film that aperture is 0.45 μm, vacuum filtration, obtained boron nitride that filter membrane, which selects diameter,
Nanometer sheet/Kevlar nanofiber composite film, 80 DEG C of dryings are for 24 hours；
(9) it takes out, is immersed in the glutaraldehyde solution of 3.5mL 50% after drying, at 70 DEG C, 40min, as high thermal conductivity
The boron nitride nanosheet of high-mechanical property/functionalization Kevlar nanofiber composite membrane.
Embodiment 4
A kind of preparation method of the laminated film containing 15wt% boron nitride nanosheet, the specific steps are as follows:
(1) boron nitride powder is calcined into 3h under nitrogen gas in 1000 DEG C of tube furnaces；
(2) boron nitride powder and 6g urea after taking 1g calcined are set in a round bottom flask, under nitrogen gas, oil bath heating
To 130 DEG C~140 DEG C progress frit reaction 4h；
(3) after the reaction was completed, solid is dispersed in 500mL deionized water, ultrasound 8~12h of removing, is surpassed in the present embodiment
Then dispersion liquid is centrifuged min under 3000 revolving speeds, obtains supernatant by sonication 10h；By supernatant liquid filtering, and use deionization
Water washing, wherein the method filtered preferably filters, by the solid being collected into, dry 10h obtains urea functionalization at 65 DEG C
Boron nitride nanosheet；
(4) 1g Kevlar and 1.5g potassium hydroxide are dissolved in 500mL dimethyl sulfoxide solvent, water-bath adds at 60 DEG C
Heat stirs one week, obtains Kevlar nanofiber/dimethyl sulfoxide dispersion liquid；
(5) it takes 50mL Kevlar nanofiber/dimethyl sulfoxide dispersion liquid, is added 2.5mL phosphoric acid, 5mL deionized water,
5h is reacted at 90~110 DEG C；
(6) centrifuge washing removes dimethyl sulfoxide, disperses in deionized water, as Kevlar nanofiber/water dispersion
Liquid；
(7) boron nitride nanosheet of 17.6mg is taken to disperse in deionized water, to be added to Kevlar nanofiber/water dispersion
In liquid；
(8) filter membrane select diameter be 50mm, aperture be 0.45 μm organic nylon leaching film (, vacuum filtration, be made boron nitride
Nanometer sheet/Kevlar nanofiber composite film, 80 DEG C of dryings are for 24 hours；
(9) it takes out, is immersed in the glutaraldehyde solution of 3.5mL 50% after drying, at 70 DEG C, 40min, as high thermal conductivity
The boron nitride nanosheet of high-mechanical property/functionalization Kevlar nanofiber composite membrane.
Fig. 1 is boron nitride nanosheet/functionalization Kevlar nanofiber composite membrane of high thermal conductivity high-mechanical property of the present invention
Experiment flow schematic diagram.
Fig. 2 schemes for the SEM figure of boron nitride nanosheet obtained in embodiment 2-4 and the SEM of commercially available boron nitride, You Tuke
See, boron nitride has obtained preferable peeling effect.
Fig. 3 is the TEM figure of boron nitride nanosheet obtained in embodiment 2-4, and as seen from the figure, boron nitride has obtained preferably
Peeling effect.
Fig. 4 is the section of boron nitride nanosheet/functionalization Kevlar nanofiber composite film obtained in embodiment 1-4
SEM figure, as seen from the figure, with the filling of boron nitride nanosheet, the section of film is no longer smooth, this is because boron nitride nanosheet
Hydrogen bond action between Kevlar nanofiber.
Fig. 5 is the stress of boron nitride nanosheet/functionalization Kevlar nanofiber composite film obtained in embodiment 1-4
Strain curve figure, as seen from the figure, as boron nitride nanosheet is inserted, tensile strength is gradually increased, when the boron nitride nanometer of filling
When the content of piece is 10wt%, tensile strength reaches peak, up to 500Mpa.
Fig. 6 is thermally conductive for boron nitride nanosheet functionalization/Kevlar nanofiber composite film obtained in embodiment 1-4
Charts for finned heat, as seen from the figure, as boron nitride nanosheet is inserted, the thermal coefficient of laminated film is also being gradually increased.
Claims (10)
1. a kind of preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber, which is characterized in that use urea function
It is first to filter self assembly by decompression as membrane material assembly for the boron nitride nanosheet of change and the Kevlar nanofiber of functionalization
Boron nitride nanosheet/functionalization Kevlar nanofiber composite film is first obtained, it is thermally conductive then to improve its by glutaraldehyde cross-linking
Performance and mechanical performance obtain boron nitride nanosheet/functionalization Kevlar nanofiber composite membrane, that is, are based on Kevlar Nanowire
The heat conducting film of dimension.
2. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber as described in claim 1, which is characterized in that
The following steps are included:
Step 1): boron nitride powder is calcined into 2~4h in 800~1000 DEG C of nitrogen furnace；
Step 2): boron nitride powder after calcined and urea 3~6h of frit reaction in a nitrogen atmosphere；
Step 3): after the reaction was completed, in deionized water by the dispersion of obtained solid, after ultrasound removing, centrifugation is collected by filtration,
Washing, dry, the boron nitride nanosheet of acquisition urea functionalization；
Step 4): Kevlar and potassium hydroxide are dissolved in dimethyl sulfoxide solvent, are stirred to react 7~10 at 20~40 DEG C
It, obtains Kevlar nanofiber/dimethyl sulfoxide dispersion liquid；
Step 5): in Kevlar nanofiber/dimethyl sulfoxide dispersion liquid, phosphoric acid and deionized water is added, at 90~110 DEG C
Under 5~6h of reaction is hydrolyzed；
Step 6): after the reaction was completed, product is centrifuged and is washed, removed remaining dimethyl sulfoxide, be then dispersed in deionized water
In, obtain Kevlar nanofiber/aqueous dispersions；
Step 7): boron nitride nanosheet aqueous dispersions are added in Kevlar nanofiber/aqueous dispersions, stirring, using true
Empty pump filter legal system obtains boron nitride nanosheet/Kevlar nanofiber composite film, is dried in vacuo；
Step 8): the laminated film after drying being immersed in glutaraldehyde solution and is chemically crosslinked, and drying is taken out after reaction, is obtained
To boron nitride nanosheet/functionalization Kevlar nanofiber composite membrane, i.e., based on the heat conducting film of Kevlar nanofiber.
3. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber as claimed in claim 2, which is characterized in that
Boron nitride powder is increased to 800~1000 DEG C with 2~5 DEG C/min in the step 1), and keeps 2~4h.
4. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber as claimed in claim 2, which is characterized in that
The mass ratio of boron nitride powder and urea is 1:5~1:7 in the step 2), and the temperature of frit reaction is 130~140 DEG C.
5. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber as claimed in claim 2, which is characterized in that
In the step 3), the time of ultrasound removing is 8~12h；The speed of centrifugation be 3000~4000rpm, Shi Changwei 10~
20min；Drying temperature is 60~80 DEG C, and drying time is 12~48h.
6. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber as claimed in claim 2, which is characterized in that
In the step 4), the mass ratio of Kevlar and potassium hydroxide is (0.2~2): (0.5~3)；Kevlar and dimethyl sulfoxide
Mass volume ratio is (0.2~2) g:(100~1000) mL.
7. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber as claimed in claim 2, which is characterized in that
In the step 5), take Kevlar nanofiber/dimethyl sulfoxide dispersion liquid, phosphoric acid, deionized water volume ratio be (50~
200): (1.25~5): (2.5~10).
8. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber as described in claim 2 or 7, feature exist
In the mass concentration of the phosphoric acid is not less than 85%.
9. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber as claimed in claim 2, which is characterized in that
In the step 7), drying temperature is 60~80 DEG C, and drying time is 12~48h.
10. the preparation method of the high-intensitive heat conducting film based on Kevlar nanofiber, feature exist as claimed in claim 2
In in the step 8), the mass concentration of glutaraldehyde solution is 50%, and dosage is that laminated film is immersed in glutaraldehyde solution
?.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113278294A (en) * | 2021-05-28 | 2021-08-20 | 西南大学 | Kevlar nanofiber/regenerated silk fibroin composite film and preparation method thereof |
| CN115260550A (en) * | 2022-07-12 | 2022-11-01 | 哈尔滨理工大学 | Method for improving insulation and thermal conductivity of polyetherimide film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112316567A (en) * | 2020-10-19 | 2021-02-05 | 江苏大学 | Nanofiber filter membrane and preparation method and device thereof |
| CN113278294A (en) * | 2021-05-28 | 2021-08-20 | 西南大学 | Kevlar nanofiber/regenerated silk fibroin composite film and preparation method thereof |
| CN113278294B (en) * | 2021-05-28 | 2022-03-01 | 西南大学 | Kevlar nanofiber/regenerated silk fibroin composite film and preparation method thereof |
| CN115260550A (en) * | 2022-07-12 | 2022-11-01 | 哈尔滨理工大学 | Method for improving insulation and thermal conductivity of polyetherimide film |
| CN115260550B (en) * | 2022-07-12 | 2024-02-06 | 哈尔滨理工大学 | Method for improving insulation heat conductivity of polyetherimide film |
| CN116478615A (en) * | 2023-03-16 | 2023-07-25 | 杭州师范大学 | Transparent flame-retardant early-warning water-based paint and preparation method and application thereof |
| CN116478615B (en) * | 2023-03-16 | 2023-10-20 | 杭州师范大学 | Transparent flame-retardant early-warning water-based paint and preparation method and application thereof |
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