Dopamine-based polymer heat-conducting composite material and preparation method thereof
By using the strong interface interaction of polydopamine and the high thermal conductivity of liquid metals, the composite system of dopamine-based polymer and liquid metal is used to solve the problem of difficulty in uniform recombination when blending liquid metals and polymers, and high thermal conductivity is achieved The improvement of capabilities meets the requirements of high thermal conductivity and long-term stability of electronic devices.
Patent Information
- Application Number
- CN202311028578.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-16
- Publication Date
- 2025-02-21
AI Technical Summary
Liquid metals are difficult to recombine uniformly when blended with polymers, resulting in insufficient thermal conductivity and cannot meet the high thermal conductivity and long-term stability requirements of electronic devices.
By utilizing the strong interface interaction of polydopamine, combined with the high thermal conductivity and low modulus of liquid metal, a composite system of dopamine-based polymer and liquid metal is used to uniformly distribute the liquid metal in the polymerization through grinding and vacuum drying methods. In the object.
The uniform composite of liquid metals in dopamineral polymer thermal composite materials has been achieved, which significantly improves the thermal conductivity of the composite materials and can better adapt to the high thermal conductivity needs of electronic devices.
Smart Images
Figure HSA0000297281830000011 
Figure HSA0000297281830000012
Abstract
Description
Technical Field
[0001] The invention belongs to the field of polymer materials, and in particular relates to a dopamine-based polymer thermal conductive composite material and a preparation method thereof. Background Art
[0002] The significant miniaturization and integration of electronic devices requires next-generation thermal interface materials with higher performance and long-term stability. Traditional methods use thermal interface materials with high thermal conductivity and geometric adaptability to improve cross-interface heat transfer.
[0003] Liquid metal has both high thermal conductivity and low modulus, and is a thermally conductive filler with great application prospects. However, the high surface tension of liquid metal hinders its device process, making it difficult for liquid metal to wet most surfaces and spontaneously form spherical droplets, which usually causes the risk of leakage and short circuit.
[0004] The catechol group of polydopamine has strong covalent and non-covalent interaction capabilities, which enables it to adhere to almost all substrate materials, even polytetrafluoroethylene with extremely low surface energy. Therefore, it can be used as a surface modification functional group to enhance the interaction between polymers and fillers, which is expected to solve the problem of liquid metal being difficult to wet.
[0005] Based on the above problems, the present invention utilizes the strong interfacial interaction of polydopamine and the high thermal conductivity and low modulus of liquid metal to solve the problem of difficulty in uniformly compounding liquid metal and polymer when blending, so that the dopamine-based polymer thermal conductive composite material has higher thermal conductivity. Summary of the invention
[0006] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a dopamine-based polymer thermal conductive composite material and a preparation method thereof, which utilizes the strong interface interaction of polydopamine and the thermal conductivity advantage of liquid metal to improve the uniform composite ability of liquid metal in the dopamine-based polymer thermal conductive composite material and the thermal conductivity of the composite material. The present invention provides the following technical solutions:
[0007] S1. Dissolve 3-methacryloyl dopamine monomer and methacryloyloxypropyl di-terminated polydimethylsiloxane monomer in tetrahydrofuran in proportion and transfer to a three-necked flask. After stirring for 30 minutes under argon, add azobisisobutyronitrile as an initiator, then heat to 60°C and stir for reaction.
[0008] S2. A small amount of methanol was added to the reactants to terminate the reaction, and then the reactants were precipitated in ice ether. The supernatant was poured off and then rotary evaporated and dried in a vacuum drying oven to obtain a dopamine-based polymer P (DMS-DMA).
[0009] S3. Dissolve the dopamine-based polymer in tetrahydrofuran in proportion, then mix the liquid metal and the polymer solution in proportion in a mortar and grind for 30 minutes to make the liquid metal and the polymer mix evenly and evaporate the solvent, and finally dry the mixture in a vacuum oven to obtain a dopamine-based polymer thermal conductive composite material.
[0010] Furthermore, the molecular weight of the methacryloxypropyl di-terminated polydimethylsiloxane monomer described in step S1 is 2500-25000 g / mol.
[0011] Furthermore, the mass ratio of the 3-methacryloyl dopamine monomer to the methacryloyloxypropyl di-terminated polydimethylsiloxane monomer in step S1 is (1:11-55).
[0012] Furthermore, the volume of tetrahydrofuran in step S1 is 20-40 mL.
[0013] Furthermore, in step S1, the mass percentage of azobisisobutyronitrile to the total monomer content is 1%-2%.
[0014] Furthermore, in step S1, the temperature is raised to 60° C. and the stirring reaction time is 48-72 hours.
[0015] Furthermore, the concentration of the dopamine-based polymer tetrahydrofuran solution in step S3 is 0.1-0.5 g / mL.
[0016] Furthermore, in step S3, the volume content of the liquid metal in the dopamine-based polymer thermally conductive composite material is 20%-60%.
[0017] The dopamine-based polymer thermally conductive composite material prepared by the present invention adopts a composite system of dopamine-based polymer and liquid metal. The present invention utilizes the strong interfacial interaction of polydopamine and the high thermal conductivity and low modulus of liquid metal to solve the problem that liquid metal and polymer are difficult to be uniformly compounded when blended, so that the dopamine-based polymer thermally conductive composite material has higher thermal conductivity. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is the structural formula of the dopamine-based polymer obtained in the present invention;
[0019] Figure 2 This is a scanning electron microscope image of the dopamine-based polymer thermal conductive composite material obtained by the present invention. DETAILED DESCRIPTION
[0020] Three embodiments of the present invention are given below to further illustrate the present invention, rather than to limit the scope of the present invention, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.
[0021] Example 1
[0022] S1. 3-Methacryloyldopamine monomer and methacryloxypropyl di-terminated polydimethylsiloxane monomer (25000 g / mol) were dissolved in 30 mL of tetrahydrofuran in a ratio of (1:11) and transferred to a three-necked flask. After stirring for 30 minutes under argon, azobisisobutyronitrile was added as an initiator, and then the temperature was raised to 60°C and stirred for 48 hours.
[0023] S2. A small amount of methanol was added to the reactants to terminate the reaction, and then the reactants were precipitated in ice ether. The supernatant was poured off and then rotary evaporated and dried in a vacuum drying oven to obtain a dopamine-based polymer P (DMS-DMA).
[0024] S3. Dissolve 1 g of dopamine-based polymer in 10 mL of tetrahydrofuran, then mix the liquid metal and the polymer solution in a proportion (the volume content of the liquid metal is 40%) in a mortar and grind for 30 minutes to allow the liquid metal and the polymer to mix evenly and allow the solvent to evaporate. Finally, place the mixture in a vacuum oven and dry it to obtain a dopamine-based polyether thermal conductive composite material.
[0025] Example 2
[0026] S1. 3-Methacryloyldopamine monomer and methacryloxypropyl di-terminated polydimethylsiloxane monomer (25000 g / mol) were dissolved in 30 mL of tetrahydrofuran in a ratio of (1:11) and transferred to a three-necked flask. After stirring for 30 minutes under argon, azobisisobutyronitrile was added as an initiator, and then the temperature was raised to 60°C and stirred for 48 hours.
[0027] S2. A small amount of methanol was added to the reactants to terminate the reaction, and then the reactants were precipitated in ice ether. The supernatant was poured off and then rotary evaporated and dried in a vacuum drying oven to obtain a dopamine-based polymer P (DMS-DMA).
[0028] S3. Dissolve 1 g of dopamine-based polymer in 10 mL of tetrahydrofuran, then mix the liquid metal and the polymer solution in proportion (the volume content of the liquid metal is 60%) in a mortar and grind for 30 minutes to allow the liquid metal and the polymer to be evenly mixed and the solvent to evaporate. Finally, place the mixture in a vacuum oven and dry it to obtain a dopamine-based polymer thermally conductive composite material.
[0029] Example 3
[0030] S1. 3-Methacryloyldopamine monomer and methacryloxypropyl di-terminated polydimethylsiloxane monomer (25000 g / mol) were dissolved in 30 mL of tetrahydrofuran in a ratio of (1:55) and transferred to a three-necked flask. After stirring for 30 minutes under argon, azobisisobutyronitrile was added as an initiator, and then the temperature was raised to 60°C and stirred for 48 hours.
[0031] S2. A small amount of methanol was added to the reactants to terminate the reaction, and then the reactants were precipitated in ice ether. The supernatant was poured off and then rotary evaporated and dried in a vacuum drying oven to obtain a dopamine-based polymer P (DMS-DMA).
[0032] S3. Dissolve 1 g of dopamine-based polymer in 10 mL of tetrahydrofuran, then mix the liquid metal and the polymer solution in proportion (the volume content of the liquid metal is 60%) in a mortar and grind for 30 minutes to allow the liquid metal and the polymer to be evenly mixed and the solvent to evaporate. Finally, place the mixture in a vacuum oven and dry it to obtain a dopamine-based polymer thermally conductive composite material.
[0033] Thermal conductivity: Tested using a thermal conductivity tester in accordance with standard ASTM D5470.
[0034] Thermal conductivity (W / m·K) Example 1 4.81 Example 2 6.94 Example 3 5.22
Claims
1. A dopamine-based polymer thermally conductive composite material and a preparation method thereof, characterized in that: S1. Dissolve 3-methacryloyl dopamine monomer and methacryloyloxypropyl di-terminated polydimethylsiloxane monomer in tetrahydrofuran in proportion and transfer to a three-necked flask. After stirring for 30 minutes under argon, add azobisisobutyronitrile as an initiator, then heat to 60°C and stir for reaction. S2. A small amount of methanol was added to the reactants to terminate the reaction, and then the reactants were precipitated in ice ether. The supernatant was poured off and then rotary evaporated and dried in a vacuum drying oven to obtain a dopamine-based polymer P (DMS-DMA). S3. Dissolve the dopamine-based polymer in tetrahydrofuran in proportion, then mix the liquid metal and the polymer solution in proportion in a mortar and grind for 30 minutes to make the liquid metal and the polymer mix evenly and evaporate the solvent, and finally dry the mixture in a vacuum oven to obtain a dopamine-based polymer thermal conductive composite material.
2. A dopamine-based polymer thermally conductive composite material and a preparation method thereof according to claim 1, characterized in that: The molecular weight of the methacryloxypropyl di-terminated polydimethylsiloxane monomer described in step S1 is 2500-25000 g / mol.
3. A dopamine-based polymer thermally conductive composite material and a preparation method thereof according to claim 1, characterized in that: The mass ratio of the 3-methacryloyl dopamine monomer to the methacryloyloxypropyl di-terminated polydimethylsiloxane monomer in step S1 is (1:11-55).
4. A dopamine-based polymer thermally conductive composite material and a preparation method thereof according to claim 1, characterized in that: The volume of tetrahydrofuran in step S1 is 20-40 mL.
5. A dopamine-based polymer thermally conductive composite material and a preparation method thereof according to claim 1, characterized in that: In step S1, the mass percentage of azobisisobutyronitrile to the total monomer content is 1%-2%.
6. A dopamine-based polymer thermally conductive composite material and a preparation method thereof according to claim 1, characterized in that: In step S1, the temperature is raised to 60° C. and the stirring reaction time is 48-72 hours.
7. A dopamine-based polymer thermally conductive composite material and a preparation method thereof according to claim 1, characterized in that: The concentration of the dopamine-based polymer tetrahydrofuran solution in step S3 is 0.1-0.5 g / mL.
8. A dopamine-based polymer thermally conductive composite material and a preparation method thereof according to claim 1, characterized in that: In step S3, the volume content of the liquid metal in the dopamine-based polymer thermal conductive composite material is 20%-60%.