CN112521651A - Polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by heating and preparation method thereof - Google Patents
Polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by heating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a polyethylene glycol-graphene composite material capable of inducing thermal conductivity to be increased by heating and a preparation method thereof. The material is in a loose porous foam state at normal temperature and has excellent heat-insulating property; when the ambient temperature exceeds 60 ℃, the material shrinks into a compact block state, and the compressed graphene is mutually stacked and connected to form a heat conduction network, so that the heat conduction capability is obviously enhanced, and the heat conductivity can be increased from 0.04W/(mK) to 0.61W/(mK). The transformation of the heat conduction capability enables the material to have the intelligent heat management characteristic of temperature response, and is suitable for the special heat management requirements of light-weight and small-sized systems.
Description
Technical Field
The invention relates to a polyethylene glycol-graphene composite material capable of inducing the thermal conductivity of the material to be increased by heating and a preparation method thereof, belonging to the field of thermal management materials.
Background
Thermal management materials generally fall into two categories, namely thermally conductive materials and thermally insulating materials. The heat conducting material can rapidly diffuse heat inside the system to the outside, and the heat insulating material can block heat transfer between the inside and the outside of the system. In order to ensure reliable operation of components and reduce energy consumption, a thermal insulation layer needs to be arranged outside a system working in a low-temperature environment to reduce heat diffusion loss. However, if the internal components are out of control due to system or human reasons, heat generation is increased, heat accumulation in the system is caused, the temperature is continuously increased, stable and reliable operation of the system is affected, and even safety accidents are caused. In order to prevent thermal runaway, heat conduction materials and heat insulation materials are commonly adopted to be matched with each other and a complex control system is adopted to precisely regulate and control so as to keep the internal temperature of the system proper. For example, in a biological test science popularization load device of Chang 'e' IV, in a large temperature difference environment of the moon of-183-127 ℃, in order to maintain the internal biological growth temperature of 1-30 ℃, heat conduction elements such as a radiating fin, a semiconductor refrigerator and the like, and heat insulation elements such as a heat insulation layer, an electric heating sheet and the like are required to be assembled, so that the energy consumption and the space test cost are greatly increased. These lightweight, miniaturized systems place a need for intelligent response characteristics of thermal management materials that are expected to be controllably tuned between thermally conductive and thermally insulative states.
From the material perspective, if the thermal insulation material can be changed into a thermal conduction material after the temperature inside the system exceeds a threshold value, the excess heat can be quickly dissipated, and thermal runaway is prevented. However, for most materials, with the increase of temperature, phonon transmission and scattering between crystal planes are increased, the thermal conductivity of the material is reduced, namely, the thermal insulation performance of the thermal insulation material at high temperature is better, and at present, no material can realize the remarkable improvement of the thermal conductivity with the increase of temperature. Whereas thermal insulation materials are typically loose cellular foams, thermal conductive materials are typically dense blocks, their thermal conductivity is expected to increase significantly if the thermal insulation material can transition from a loose cellular state to a dense packed state at elevated temperatures.
Shape memory polymers are a new class of smart actuating materials that can be deformed from shape a to shape B in a predefined manner by a specific stimulus, such as heat, light, an electric field, a magnetic field, water or a solution. The shape memory polymer foam has the characteristics of small density, high compressibility, porous structure and shape memory recovery of the shape memory polymer, and has research value in many aspects. The graphene is a planar flaky nano material obtained by oxidizing, intercalating and stripping natural crystalline flake graphite. Graphene has a regular and ordered graphite atomic layer, and thus has less phonon conduction inhibition, fewer in-plane defects, and high heat conduction efficiency, and is often used as a polymer-based heat conduction filler. The shape memory polymer foam is used as a matrix, the graphene is used as a heat conducting filler, and the shape memory polymer foam and the graphene are compounded to form an intelligent heat management material which is expected to realize temperature response, so that the defects of the prior art are overcome.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a polyethylene glycol-graphene composite material capable of inducing the thermal conductivity of the material to be increased by heating and a preparation method thereof. The material is in a loose and porous state at the temperature of below 60 ℃, and has excellent heat insulation performance. When the temperature rises to 60 ℃, the material shrinks into a compact block state, the thermal conductivity is obviously improved, and thermal runaway is prevented.
The technical purpose of the invention is realized by the following technical scheme.
A polyethylene glycol-graphene composite material capable of inducing thermal conductivity to be increased by heating and a preparation method thereof are carried out according to the following steps:
step 1, synthesizing polyethylene glycol acrylate
Uniformly dispersing hydroxyl-terminated polyethylene glycol in a solvent, adding acryloyl chloride under inert protective gas to carry out pre-reaction at the room temperature of 20-25 ℃, adding an acid-binding agent, and heating to 55-70 ℃ to continue the reaction to obtain polyethylene glycol acrylate; the molar ratio of the hydroxyl groups in the acryloyl chloride and the polyethylene glycol is (1-5): 1, the molar ratio of hydroxyl in the acid-binding agent to the polyethylene glycol is (1-3): 1
In step 1, the solvent is anhydrous tetrahydrofuran; the inert protective gas is nitrogen, helium or argon.
In step 1, the molar ratio of the hydroxyl groups in the acryloyl chloride and the polyethylene glycol is (3-5): 1.
in the step 1, the acid-binding agent is triethylamine, and the molar ratio of hydroxyl groups in the triethylamine to the polyethylene glycol is (2-3): 1.
in step 1, the pre-reaction is carried out at room temperature of 20-25 ℃ for 1-3 hours.
In the step 1, after the acid binding agent is added, the reaction temperature is 60-70 ℃, and the reaction time is 1-5 hours.
In the step 1, the number average molecular weight of the hydroxyl-terminated polyethylene glycol is 2000-6000 g/mol, and the concentration of the polyethylene glycol in a solvent is 15-40 g/mL.
In the step 1, after the reaction is finished, condensing and refluxing, centrifuging while hot to remove insoluble triethylamine salt, collecting supernatant, concentrating by rotary evaporation, then settling the concentrated solution twice in glacial ethyl ether, performing suction filtration to collect white powder, and performing vacuum drying to obtain the polyethylene glycol acrylate.
The reaction process of step 1 is shown as the following formula:
step 2, preparing the polyethylene glycol-graphene composite material
Uniformly dispersing the polyethylene glycol acrylate obtained in the step (1) in a partially reduced graphene oxide aqueous dispersion, adding an initiator, heating to a temperature higher than an initiation temperature to perform reaction, curing, demolding to obtain polyethylene glycol-graphene composite hydrogel, and removing an ice phase after freeze drying to obtain a polyethylene glycol-graphene composite material; in the partially reduced graphene oxide aqueous dispersion, the concentration of the partially reduced graphene oxide is 1-5 mg/mL, and after polyethylene glycol acrylate is added, the mass percentage of the polyethylene glycol acrylate is 10-50 wt%.
In the step 2, the initiator is ammonium persulfate, an ammonium persulfate aqueous solution is selectively added, and the concentration of the ammonium persulfate in the ammonium persulfate aqueous solution is 0.04-0.12 g/mL, preferably 0.08-0.12 g/mL; the adding amount of the aqueous solution of the peroxymethionine is 5-20 wt%, preferably 10-20 wt% of the total mass of the reaction system.
In the step 2, the polyethylene glycol-graphene composite hydrogel obtained by demolding is soaked in water for 24-48 h to fully swell, the surface water is wiped dry, and the hydrogel is placed in a refrigerator at the temperature of-30 to-10 ℃ for 4-8 h to gradually freeze the water in the hydrogel.
In the step 2, the concentration of the partially reduced graphene oxide in the partially reduced graphene oxide aqueous dispersion is 3-5 mg/mL, and after polyethylene glycol acrylate is added, the mass percentage of the polyethylene glycol acrylate is 20-40 wt%.
In the step 2, adding an initiator, heating to 50-70 ℃ and reacting for 20-24 hours.
The polyethylene glycol-graphene composite material with the heat shrinkage effect is obtained by using polyethylene glycol and graphene as raw materials through end group crosslinking and freeze drying. The polyethylene glycol-graphene composite hydrogel is subjected to phase separation in the low-temperature freezing process, is frozen by water separation, and is used as a framework to pull polyethylene glycol molecular chains to be oriented and crystallized, so that the polyethylene glycol phase shape memory effect is endowed. In the temperature rising process, the polyethylene glycol molecular chains are unfrozen, the molecular chains are induced to shrink and recover through entropy elasticity, the polyethylene glycol-graphene composite material is shrunk into a compact block from foam, meanwhile, compressed graphene is stacked and connected to form a heat conducting network, and the heat conductivity is increased from 0.04W/(mK) to 0.61W/(mK). The obtained material has obviously increased heat conduction capability along with the temperature rise to the threshold value, realizes the intelligent heat management characteristic of temperature response, and makes up the defects of the prior art.
Drawings
Fig. 1 is a schematic diagram of structure transition of the polyethylene glycol-graphene composite material in the temperature rise process.
Fig. 2 is a scanning electron microscope photograph of the polyethylene glycol-graphene composite material at normal temperature.
FIG. 3 is a scanning electron micrograph of the polyethylene glycol-graphene composite material of the present invention after heat treatment at 60 ℃.
Detailed Description
The following 4 examples of the present invention are given to further illustrate the present invention and not to limit the scope of the present invention. Wherein the partially reduced graphene oxide dispersion is commercially available. The number of moles of terminal hydroxyl groups was calculated based on the number average molecular weight, mass and capping of the hydroxyl-terminated polyethylene glycol.
Example 1
1) Synthesis of polyethylene glycol acrylate: the hydroxyl-terminated polyethylene glycol having a number average molecular weight of 3500 was dissolved in anhydrous tetrahydrofuran to prepare a solution having a concentration of 30 g/mL. Under the protection of argon, slowly dropwise adding acryloyl chloride with the molar equivalent of 4 times of hydroxyl, pre-reacting for 1 hour at room temperature, then adding triethylamine with the molar equivalent of 2 times of hydroxyl as an acid-binding agent, heating to 65 ℃, continuing to react for 4 hours, and condensing and refluxing. The insoluble triethylamine salt was removed by centrifugation while hot and the supernatant collected and concentrated by rotary evaporation. And then, settling the concentrated solution twice in glacial ethyl ether, performing suction filtration to collect white powder, and performing vacuum drying to obtain the polyethylene glycol acrylate.
2) Preparing a polyethylene glycol-graphene composite material: dissolving a proper amount of polyethylene glycol acrylate obtained in the step 1) in a partially reduced graphene oxide aqueous dispersion with the concentration of 5mg/mL, wherein the mass fraction of the polyethylene glycol acrylate is 30 wt%. And then adding 10 wt% of ammonium persulfate aqueous solution with the concentration of 0.08g/mL as an initiator, uniformly stirring, placing in a 60 ℃ drying oven for curing for 24h, and demolding to obtain the polyethylene glycol-graphene composite hydrogel. Soaking the hydrogel in water for 48h for swelling, wiping off surface water, and placing in a refrigerator at-20 deg.C for 4h to gradually freeze the water in the hydrogel and separate from polyethylene glycol. And immediately freezing and drying to remove the ice phase to obtain the polyethylene glycol-graphene composite material.
Measuring the thermal conductivity of the polyethylene glycol-graphene composite material by using a hot plate method, wherein the thermal conductivity of the material is 0.04W/(mK) when the ambient temperature is 25 ℃; after the ambient temperature is raised to 60 ℃, the thermal conductivity of the material is 0.61W/(mK).
Example 2
1) Synthesis of polyethylene glycol acrylate: hydroxyl-terminated polyethylene glycol having a number average molecular weight of 2000 was dissolved in anhydrous tetrahydrofuran to prepare a solution having a concentration of 30 g/mL. Under the protection of argon, slowly dropwise adding acryloyl chloride with the molar equivalent of 4 times of hydroxyl, pre-reacting for 1 hour at room temperature, then adding triethylamine with the molar equivalent of 2 times of hydroxyl as an acid-binding agent, heating to 65 ℃, continuing to react for 4 hours, and condensing and refluxing. The insoluble triethylamine salt was removed by centrifugation while hot and the supernatant collected and concentrated by rotary evaporation. And then, settling the concentrated solution twice in glacial ethyl ether, performing suction filtration to collect white powder, and performing vacuum drying to obtain the polyethylene glycol acrylate.
2) Preparing a polyethylene glycol-graphene composite material: dissolving a proper amount of polyethylene glycol acrylate obtained in the step 1) in a partially reduced graphene oxide aqueous dispersion with the concentration of 5mg/mL, wherein the mass fraction of the polyethylene glycol acrylate is 30 wt%. And then adding 10 wt% of ammonium persulfate aqueous solution with the concentration of 0.08g/mL as an initiator, uniformly stirring, placing in a 60 ℃ drying oven for curing for 24h, and demolding to obtain the polyethylene glycol-graphene composite hydrogel. Soaking the hydrogel in water for 48h for swelling, wiping off surface water, and placing in a refrigerator at-20 deg.C for 4h to gradually freeze the water in the hydrogel and separate from polyethylene glycol. And immediately freezing and drying to remove the ice phase to obtain the polyethylene glycol-graphene composite material.
Measuring the thermal conductivity of the polyethylene glycol-graphene composite material by using a hot plate method, wherein the thermal conductivity of the material is 0.11W/(mK) when the ambient temperature is 25 ℃; after the ambient temperature is raised to 60 ℃, the thermal conductivity of the material is 0.70W/(mK).
Example 3
1) Synthesis of polyethylene glycol acrylate: the hydroxyl-terminated polyethylene glycol having a number average molecular weight of 3500 was dissolved in anhydrous tetrahydrofuran to prepare a solution having a concentration of 30 g/mL. Under the protection of argon, slowly dropwise adding acryloyl chloride with the molar equivalent of 4 times of hydroxyl, pre-reacting for 1 hour at room temperature, then adding triethylamine with the molar equivalent of 2 times of hydroxyl as an acid-binding agent, heating to 65 ℃, continuing to react for 4 hours, and condensing and refluxing. The insoluble triethylamine salt was removed by centrifugation while hot and the supernatant collected and concentrated by rotary evaporation. And then, settling the concentrated solution twice in glacial ethyl ether, performing suction filtration to collect white powder, and performing vacuum drying to obtain the polyethylene glycol acrylate.
2) Preparing a polyethylene glycol-graphene composite material: dissolving a proper amount of polyethylene glycol acrylate obtained in the step 1) in a partially reduced graphene oxide aqueous dispersion with the concentration of 2mg/mL, wherein the mass fraction of the polyethylene glycol acrylate is 30 wt%. And then adding 10 wt% of ammonium persulfate aqueous solution with the concentration of 0.08g/mL as an initiator, uniformly stirring, placing in a 60 ℃ drying oven for curing for 24h, and demolding to obtain the polyethylene glycol-graphene composite hydrogel. Soaking the hydrogel in water for 48h for swelling, wiping off surface water, and placing in a refrigerator at-20 deg.C for 4h to gradually freeze the water in the hydrogel and separate from polyethylene glycol. And immediately freezing and drying to remove the ice phase to obtain the polyethylene glycol-graphene composite material.
Measuring the thermal conductivity of the polyethylene glycol-graphene composite material by using a hot plate method, wherein the thermal conductivity of the material is 0.04W/(mK) when the ambient temperature is 25 ℃; after the ambient temperature is raised to 60 ℃, the thermal conductivity of the material is 0.31W/(mK).
Example 4
1) Synthesis of polyethylene glycol acrylate: hydroxyl-terminated polyethylene glycol having a number average molecular weight of 6000 was dissolved in anhydrous tetrahydrofuran to prepare a solution having a concentration of 30 g/mL. Under the protection of argon, slowly dropwise adding acryloyl chloride with the molar equivalent of 4 times of hydroxyl, pre-reacting for 1 hour at room temperature, then adding triethylamine with the molar equivalent of 2 times of hydroxyl as an acid-binding agent, heating to 65 ℃, continuing to react for 4 hours, and condensing and refluxing. The insoluble triethylamine salt was removed by centrifugation while hot and the supernatant collected and concentrated by rotary evaporation. And then, settling the concentrated solution twice in glacial ethyl ether, performing suction filtration to collect white powder, and performing vacuum drying to obtain the polyethylene glycol acrylate.
2) Preparing a polyethylene glycol-graphene composite material: dissolving a proper amount of polyethylene glycol acrylate obtained in the step 1) in a partially reduced graphene oxide aqueous dispersion with the concentration of 2mg/mL, wherein the mass fraction of the polyethylene glycol acrylate is 30 wt%. And then adding 10 wt% of ammonium persulfate aqueous solution with the concentration of 0.08g/mL as an initiator, uniformly stirring, placing in a 60 ℃ drying oven for curing for 24h, and demolding to obtain the polyethylene glycol-graphene composite hydrogel. Soaking the hydrogel in water for 48h for swelling, wiping off surface water, and placing in a refrigerator at-20 deg.C for 4h to gradually freeze the water in the hydrogel and separate from polyethylene glycol. And immediately freezing and drying to remove the ice phase to obtain the polyethylene glycol-graphene composite material.
Measuring the thermal conductivity of the polyethylene glycol-graphene composite material by using a hot plate method, wherein the thermal conductivity of the material is 0.03W/(mK) when the ambient temperature is 25 ℃; after the ambient temperature is raised to 60 ℃, the thermal conductivity of the material is 0.35W/(mK).
The preparation of the polyethylene glycol-graphene composite material can be realized by adjusting the process parameters according to the content of the invention, and at 25 ℃ (namely below 60 ℃), the polyvinyl alcohol is in a loose and porous foam shape, the graphene is sparsely filled in foam holes or attached to foam walls, and the thermal conductivity of the material is relatively low, such as 0.02-0.12W/(mK); after the ambient temperature is raised to be higher than 60 ℃, polyvinyl alcohol shrinks into a compact block state, and simultaneously, compressed graphene is stacked and connected to form a heat conduction network, so that the heat conductivity is increased to 0.3-0.8W/(mK), and the polyvinyl alcohol is endowed with shape memory characteristics through end group crosslinking and freeze drying processing, namely the application of the polyethylene glycol-graphene composite material in an intelligent heat management material.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. The polyethylene glycol-graphene composite material capable of inducing thermal conductivity to be increased by heating is characterized in that at 25 ℃, polyvinyl alcohol is in a loose and porous foam shape, graphene is sparsely filled in foam holes or attached to a foam wall, and the thermal conductivity of the material is relatively low; after the ambient temperature rises to above 60 ℃, the polyvinyl alcohol shrinks into a compact block state, and the compressed graphene is stacked and connected to form a heat conducting network, so that the heat conductivity is increased, and the method comprises the following steps:
step 1, synthesizing polyethylene glycol acrylate
Uniformly dispersing hydroxyl-terminated polyethylene glycol in a solvent, adding acryloyl chloride under inert protective gas to carry out pre-reaction at the room temperature of 20-25 ℃, adding an acid-binding agent, and heating to 55-70 ℃ to continue the reaction to obtain polyethylene glycol acrylate; the molar ratio of the hydroxyl groups in the acryloyl chloride and the polyethylene glycol is (1-5): 1, the molar ratio of hydroxyl in the acid-binding agent to the polyethylene glycol is (1-3): 1;
step 2, preparing the polyethylene glycol-graphene composite material
Uniformly dispersing the polyethylene glycol acrylate obtained in the step (1) in a partially reduced graphene oxide aqueous dispersion, adding an initiator, heating to a temperature higher than an initiation temperature to perform reaction, curing, demolding to obtain polyethylene glycol-graphene composite hydrogel, and removing an ice phase after freeze drying to obtain a polyethylene glycol-graphene composite material; in the partially reduced graphene oxide aqueous dispersion, the concentration of the partially reduced graphene oxide is 1-5 mg/mL, and after polyethylene glycol acrylate is added, the mass percentage of the polyethylene glycol acrylate is 10-50 wt%.
2. The polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by temperature rise according to claim 1, wherein in the step 1, the number average molecular weight of the hydroxyl-terminated polyethylene glycol is 2000-6000 g/mol, and the concentration of the polyethylene glycol in the solvent is 15-40 g/mL; the solvent is anhydrous tetrahydrofuran; the inert protective gas is nitrogen, helium or argon; the molar ratio of the hydroxyl groups in the acryloyl chloride and the polyethylene glycol is (3-5): 1; the acid-binding agent is triethylamine, and the molar ratio of hydroxyl in triethylamine to hydroxyl in polyethylene glycol is (2-3): 1.
3. the polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by temperature rise according to claim 1, wherein in the step 1, pre-reaction is performed at room temperature of 20-25 ℃, and the pre-reaction time is 1-3 hours; after the acid binding agent is added, the reaction temperature is 60-70 ℃, and the reaction time is 1-5 hours.
4. The polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by heating according to claim 1, wherein in the step 2, an initiator is added, and the temperature is raised to 50-70 ℃ to react for 20-24 hours; the initiator is ammonium persulfate, an ammonium persulfate aqueous solution is selectively added, and the concentration of the ammonium persulfate in the ammonium persulfate aqueous solution is 0.04-0.12 g/mL, preferably 0.08-0.12 g/mL; the adding amount of the aqueous solution of the peroxymethionine is 5-20 wt%, preferably 10-20 wt% of the total mass of the reaction system.
5. The polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by heating according to claim 1, wherein in the step 2, the polyethylene glycol-graphene composite hydrogel obtained by demolding is immersed in water for 24-48 hours to fully swell, the surface moisture is wiped dry, and the polyethylene glycol-graphene composite hydrogel is placed in a refrigerator at-30 to-10 ℃ for 4-8 hours to gradually freeze the moisture in the hydrogel; in the partially reduced graphene oxide aqueous dispersion, the concentration of the partially reduced graphene oxide is 3-5 mg/mL, and after polyethylene glycol acrylate is added, the mass percentage of the polyethylene glycol acrylate is 20-40 wt%.
6. A preparation method of a polyethylene glycol-graphene composite material capable of inducing thermal conductivity to be increased by heating is characterized by comprising the following steps:
step 1, synthesizing polyethylene glycol acrylate
Uniformly dispersing hydroxyl-terminated polyethylene glycol in a solvent, adding acryloyl chloride under inert protective gas to carry out pre-reaction at the room temperature of 20-25 ℃, adding an acid-binding agent, and heating to 55-70 ℃ to continue the reaction to obtain polyethylene glycol acrylate; the molar ratio of the hydroxyl groups in the acryloyl chloride and the polyethylene glycol is (1-5): 1, the molar ratio of hydroxyl in the acid-binding agent to the polyethylene glycol is (1-3): 1;
step 2, preparing the polyethylene glycol-graphene composite material
Uniformly dispersing the polyethylene glycol acrylate obtained in the step (1) in a partially reduced graphene oxide aqueous dispersion, adding an initiator, heating to a temperature higher than an initiation temperature to perform reaction, curing, demolding to obtain polyethylene glycol-graphene composite hydrogel, and removing an ice phase after freeze drying to obtain a polyethylene glycol-graphene composite material; in the partially reduced graphene oxide aqueous dispersion, the concentration of the partially reduced graphene oxide is 1-5 mg/mL, and after polyethylene glycol acrylate is added, the mass percentage of the polyethylene glycol acrylate is 10-50 wt%.
7. The preparation method of the polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by temperature rise according to claim 6, wherein in the step 1, the number average molecular weight of the hydroxyl-terminated polyethylene glycol is 2000-6000 g/mol, and the concentration of the polyethylene glycol in the solvent is 15-40 g/mL; the solvent is anhydrous tetrahydrofuran; the inert protective gas is nitrogen, helium or argon; the molar ratio of the hydroxyl groups in the acryloyl chloride and the polyethylene glycol is (3-5): 1; the acid-binding agent is triethylamine, and the molar ratio of hydroxyl in triethylamine to hydroxyl in polyethylene glycol is (2-3): 1; pre-reacting at room temperature of 20-25 ℃ for 1-3 hours; after the acid binding agent is added, the reaction temperature is 60-70 ℃, and the reaction time is 1-5 hours.
8. The preparation method of the polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by heating according to claim 6, wherein in the step 2, an initiator is added, and the temperature is raised to 50-70 ℃ to react for 20-24 hours; the initiator is ammonium persulfate, an ammonium persulfate aqueous solution is selectively added, and the concentration of the ammonium persulfate in the ammonium persulfate aqueous solution is 0.04-0.12 g/mL, preferably 0.08-0.12 g/mL; the adding amount of the aqueous solution of the peroxymethionine is 5-20 wt%, preferably 10-20 wt% of the total mass of the reaction system.
9. The preparation method of the polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by heating according to claim 6, wherein in the step 2, the polyethylene glycol-graphene composite hydrogel obtained by demolding is soaked in water for 24-48 hours for full swelling, surface moisture is wiped off, and the polyethylene glycol-graphene composite hydrogel is placed in a refrigerator at the temperature of-30 ℃ to-10 ℃ for 4-8 hours to gradually freeze the moisture in the hydrogel; in the partially reduced graphene oxide aqueous dispersion, the concentration of the partially reduced graphene oxide is 3-5 mg/mL, and after polyethylene glycol acrylate is added, the mass percentage of the polyethylene glycol acrylate is 20-40 wt%.
10. Use of a polyethylene glycol-graphene composite material with increased temperature-induced thermal conductivity according to any one of claims 1-5 in an intelligent thermal management material.
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| CN201910887118.3A CN112521651B (en) | 2019-09-19 | 2019-09-19 | Polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by heating and preparation method thereof |
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| CN201910887118.3A CN112521651B (en) | 2019-09-19 | 2019-09-19 | Polyethylene glycol-graphene composite material capable of inducing thermal conductivity to increase by heating and preparation method thereof |
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| CN112521651A true CN112521651A (en) | 2021-03-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20150259212A1 (en) * | 2012-08-23 | 2015-09-17 | Monash University | Graphene-based materials |
| CN105694433A (en) * | 2016-03-30 | 2016-06-22 | 天津大学 | Preparation method of polymer foam/graphene composite material integrating high heat conductivity and high flexibility |
| CN107434905A (en) * | 2017-04-14 | 2017-12-05 | 深圳中科中聚创新材料有限公司 | Heat-conducting polymer composite material and preparation method and application thereof |
| CN108250728A (en) * | 2018-03-09 | 2018-07-06 | 四川大学 | A kind of polymer/graphene aeroge composite foam material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150259212A1 (en) * | 2012-08-23 | 2015-09-17 | Monash University | Graphene-based materials |
| CN105694433A (en) * | 2016-03-30 | 2016-06-22 | 天津大学 | Preparation method of polymer foam/graphene composite material integrating high heat conductivity and high flexibility |
| CN107434905A (en) * | 2017-04-14 | 2017-12-05 | 深圳中科中聚创新材料有限公司 | Heat-conducting polymer composite material and preparation method and application thereof |
| CN108250728A (en) * | 2018-03-09 | 2018-07-06 | 四川大学 | A kind of polymer/graphene aeroge composite foam material and preparation method thereof |
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