Heat-conducting graphene-polymer composite thin film and preparation method and application thereof

A technology of composite film and heat-conducting graphite, which is applied in the field of heat-conducting polymer composite materials, shape-memory polymer composite materials, and functional composite materials. The effects of industrialized manufacturing and low-cost promotion and application, compact process, and easy-to-obtain components

Inactive Publication Date: 2020-01-31
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The thermal deformation temperature of the shape memory high thermal conductivity medical external fixation multilayer material provided by the invention is 50-70°C, but its main components are high-priced raw materials such as polycaprolactone and silicone rubber, and special preparation of nano-silver is required. Loading graphene microchips leads to more preparation procedures and higher costs, making it difficult to industrialize preparation and promotion, which limits its application.

Method used

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  • Heat-conducting graphene-polymer composite thin film and preparation method and application thereof
  • Heat-conducting graphene-polymer composite thin film and preparation method and application thereof
  • Heat-conducting graphene-polymer composite thin film and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] See attached Figure 1~3 , the heat-driven shape memory heat-conducting graphene-polymer composite film material provided by this embodiment is made of the following components by weight percentage:

[0032] Graphene 10-30,

[0033] Nanocellulose 35-45,

[0034] Polyethylene glycol 35-45.

[0035] The average horizontal size of the graphene is 5-10 μm, the average thickness is 6-8 nm, and the oxygen element content is ≤2.50%; the diameter of the nanocellulose is 5-100 nm, and the aspect ratio is 100-1000; polyethylene Diols have a molecular weight of 6,000 to 10,000.

[0036] The preparation method of the heat-conducting graphene-polymer composite film of aforementioned heat-driven shape memory, comprises the following steps:

[0037] (1) Graphene is added into deionized water, ultrasonically dispersed for 0.5-1 h, and a graphene dispersion with a concentration of 1-5 mg / mL is prepared;

[0038] (2) Nanocellulose is added to deionized water, ultrasonically disperse...

Embodiment 2

[0045] The thermally-driven shape memory heat-conducting graphene-polymer composite film material, preparation method and application thereof provided in this embodiment are basically the same as in Example 1, except that:

[0046] The weight percentage of graphene, nanocellulose and polyethylene glycol for preparing the composite film material is 20:40:40.

[0047] The preparation method of the thermally-driven shape memory heat-conducting graphene-polymer composite film comprises the following steps:

[0048] (1) Graphene is added into deionized water, ultrasonically dispersed for 0.5h, and a graphene dispersion with a concentration of 5mg / mL is prepared;

[0049] (2) adding nanocellulose into deionized water, ultrasonically dispersing for 0.5 h, and preparing a nanocellulose dispersion with a concentration of 5 mg / mL;

[0050] (3) Polyethylene glycol was added to deionized water, ultrasonically dispersed for 0.5 h, and a polyethylene glycol dispersion with a concentration of...

Embodiment 3

[0055] The steps of this embodiment are the same as those of Example 1, the difference being the weight ratio of graphene, nanocellulose and polyethylene glycol in the thermally conductive graphene-polymer composite film of heat-driven shape memory described in this embodiment For 25:37.5:37.5.

[0056] The thermal conductivity of the thermally actuated shape memory thermally conductive graphene-polymer composite film prepared in Example 3 was tested with a laser thermal conductivity meter LFA447 from the German Netzsch Company, and the test result was: the transverse thermal conductivity was 12.46W m -1 ·K -1 , and has very good flexibility, after bending 500 degrees, the thermal conductivity ranges from 0 to 10%. The shape recovery rate of the composite film within 60s at 70°C is greater than 90%.

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Abstract

The invention discloses a heat-conducting graphene-polymer composite thin film which is prepared from the following components by the weight percentage: 10%-30% of graphene, 35%-45% of nano-celluloseand 35%-45% of polyethylene glycol. The invention also discloses a preparation method of the heat-conducting graphene-polymer composite thin film, wherein the preparation method comprises the steps: uniformly mixing and stirring a prepared graphene dispersion liquid, a nano-cellulose dispersion liquid and a polyethylene glycol dispersion liquid according to a certain weight ratio, and then carrying out ultrasonic treatment for 0.5-1 h to obtain a graphene-nano-cellulose-polyethylene glycol mixed solution with the concentration of 1-5 mg / mL; putting the graphene-polyethylene glycol-nano-cellulose mixed solution into a vacuum drying oven, standing for 1-2 h in a vacuum environment at room temperature, removing gas existing in the mixed solution, pouring the liquid into a mold, putting the mold into a drying oven, and drying for 12-24 h at the temperature of 40-50 DEG C, so as to obtain the heat-conducting graphene-polymer composite thin film. The preparation method disclosed by the invention is simple in process and easy to industrialize; the prepared composite thin film has flexibility, high transverse thermal conductivity and thermally driven shape memory performance, and can be applied to manufacturing of intelligent products.

Description

technical field [0001] The invention relates to the technical field of functional composite materials, in particular to a thermally conductive graphene-polymer composite film with thermally driven shape memory and a preparation method thereof, belonging to the fields of thermally conductive polymer composite materials and shape memory polymer composite materials. Background technique [0002] Graphene is a new type of two-dimensional carbon nanomaterial with high specific surface area, excellent mechanical properties and thermal conductivity. Theoretical research shows that the thermal conductivity of graphene at room temperature is 5300W·m -1 ·K -1 , is currently known to have the highest thermal conductivity of the material, is a very ideal thermal conductivity filler. After adding graphene, the thermal conductivity of polymer materials can be greatly improved, while maintaining other properties of itself. [0003] Cellulose materials have the characteristics of wide so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/04C08L71/02C08K3/04
CPCC08J5/18C08J2301/04C08J2371/02C08K3/042
Inventor 丁鹏崔思奇宋娜施利毅
Owner SHANGHAI UNIV
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