Preparation method of polyimide/graphene nanocomposite material

A nanocomposite material and polyimide technology, which is applied in the field of preparation of functional polymer materials, can solve the problems that graphene is not easy to be prepared in large quantities, and achieve the effects of convenient operation, easy industrialization, and simple process

Active Publication Date: 2011-12-07
YANGZHONG HUAXIN FUSHU ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, graphene is not easy to prepare in large quantities, and it exists in the form of aggregates in the macroscopic form. In order to make full use of its high strength, high modulus, high electrical conductivity, good chemical and heat resistance, and high specific surface area, it needs to be physically or chemically modified. The method of applying graphene to the reinforcement of polymer materials also has important academic value
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Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0009] Example 1

[0010] a. Synthesis of graphite oxide: use 5 g of natural graphite as raw material, add 200 ml of concentrated sulfuric acid and 5 g of sodium nitrate, stir in an ice bath for 30 min, then slowly add 10 g of potassium permanganate, and wait until the potassium permanganate is completely dissolved Afterwards, the reaction system was transferred to a 35°C water bath and stirred for half an hour. 200 ml of deionized water was slowly added to the reaction system. The stirring was continued, and then 50 ml of 30% hydrogen peroxide solution was added. Finally, the above solution The graphite oxide can be obtained by centrifugal filtration, washing with water for several times to neutrality and drying.

[0011] b. Preparation of polyimide / graphene nanocomposite: Take 0.1g of graphite oxide and disperse it in 100 ml of N,N-dimethylacetamide, N,N-dimethylformamide or methylpyrrolidone), and ultrasound After 30 minutes of dispersion, 10 ml of toluene diisocyanate was ad...

Example Embodiment

[0012] Example 2

[0013] a. The graphite oxide preparation process and steps in this example are the same as those in Example 1a. The difference is the preparation of polyimide / graphene nanocomposites.

[0014] b. Preparation of polyimide / graphene nanocomposite: Disperse 0.1 g of graphite oxide in 100 ml of organic solvent N,N-dimethylformamide. After ultrasonic dispersion for 30 minutes, add 10 ml of toluene diisocyanate and continue ultrasonication 30 minutes. Then add 5.05g of diaminodiphenylmethane, stir evenly, add 5.55g of biphenyltetracarboxylic dianhydride, stir for 12 hours at room temperature, and heat the product in an oven at 100°C for 30 minutes, 180°C for 30 minutes, 250°C Heating for 1 hour and 350° C. for 2 hours to obtain a polyimide / graphene nanocomposite material.

Example Embodiment

[0015] Example 3

[0016] a. The graphite oxide preparation process and steps in this example are the same as those in Example 1a. The difference is the preparation of polyimide / graphene nanocomposites.

[0017] b. Preparation of polyimide / graphene nanocomposite: Disperse 0.1g of graphite oxide in 100 ml of organic solvent methyl pyrrolidone. After ultrasonic dispersion for 30 minutes, add 10 ml of 1,6 hexamethylene diisocyanate and continue ultrasonication for 30 minutes . Then add 5.05g diaminodiphenylmethane, stir evenly, add 5.55g biphenyltetracarboxylic dianhydride, stir at room temperature for 24 hours, and heat the product in an oven at 100°C for 30 minutes, 180°C for 30 minutes, 250°C Heating for 1 hour and 350°C for 2 hours to obtain a polyimide / graphene nanocomposite material.

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Abstract

The invention discloses a preparation method for a polyimide/graphene nanocomposite material. The method is characterized by: adopting graphite as a raw material; adopting a modified Hummers method for synthesis of a graphene oxide; adopting an organic molecule containing isocyanic acid radical to modify the graphene oxide; uniformly dispersing the surface modified graphene oxide in an organic solvent system, adding equivalent dianhydride monomer and equivalent diamine monomer at a temperature of 0-25 DEG C after uniformly dispersing; continuously carrying out the reaction for 6-24 hours, followed by carrying out heat treatment for the resulting solution to prepare the high-performance polyimide/graphene nanocomposite material. With the prepared polyimide/graphene nanocomposite material through an in situ polymerization method, dispersing problems and compatibility problems of the graphene in the polyimide matrix are solved, the polyimide nanocomposite material with good dispersity isobtained. In addition, the prepared material provided by the present invention has potential application values in the fields of heat resistant materials, structural materials, conductive materials, adhesives, and the like.

Description

technical field [0001] The invention belongs to a preparation method of a functional polymer material, in particular to a preparation method of a polyimide / graphene nanocomposite material. Background technique [0002] Polyimide (PI) is an aromatic heterocyclic polymer containing imide groups in the repeating unit. Polyamic acid is formed by the reaction of organic aromatic diacid anhydride and organic aromatic diamine by melt polycondensation or solution polycondensation. After heating or A polymer material obtained by chemical imidization. Due to the very stable aromatic heterocyclic structural unit in the PI molecule, it has excellent properties unmatched by other polymers, so it is widely used in aerospace, electrical, microelectronics and automobile industries. However, due to the macromolecular orientation effect of the PI with rigid structure prepared by pyromellitic anhydride, which is widely used at present, the dielectric properties are anisotropic, which is diffi...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08K9/04C08K3/04
Inventor 贡津
Owner YANGZHONG HUAXIN FUSHU ELECTRICAL EQUIP
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