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Polyethylenimine modified graphene oxide and epoxy nano composite material thereof

A technology of polyethyleneimine and composite materials, which is applied in the treatment of dyed low-molecular organic compounds, dyed high-molecular organic compounds, and fibrous fillers. It can solve the problem of insufficient bonding strength of compatible interfaces and the inability to fully utilize the advantages of graphene. , The mechanical properties of composite materials need to be further improved, etc., to achieve the effects of improving mechanical properties, elongation at break, and good application prospects

Pending Publication Date: 2019-06-25
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the currently prepared graphene oxide / resin-based composite materials, due to the lack of compatibility and interfacial bonding strength between graphene oxide and resin matrix, the advantages of graphene cannot be fully utilized, and the mechanical properties of composite materials need to be further improved.

Method used

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  • Polyethylenimine modified graphene oxide and epoxy nano composite material thereof
  • Polyethylenimine modified graphene oxide and epoxy nano composite material thereof
  • Polyethylenimine modified graphene oxide and epoxy nano composite material thereof

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Embodiment 1

[0036] Embodiment 1, the preparation of polyethyleneimine modified graphene oxide of the present invention

[0037] according to figure 1 The synthetic route shown is to synthesize the polyethyleneimine-modified graphene oxide (PEI-GO) of the present invention.

[0038] Weigh 0.4g graphene oxide (GO), C / O molar ratio is (6.9~7.1): 3, purchased from Beijing Carbon Century Technology Co., Ltd.) cell crushing ultrasonic dispersion in 400mL dry dimethylacetamide (DMAC) , 4 mmol of dimethylaminopyridine (DMAP) and N, N-dicyclohexylcarbodiimide (DCC) were added in proportion to the dispersed GO suspension, and the water bath was ultrasonically activated for 2 h. The GO suspension after dispersion activation was added into a 1000mL three-necked flask, and 12mmol of polyethyleneimine (PEI, purchased from Shanghai Demao Co., Ltd.) was added. The mixture was reacted at 90° C. for 24 hours. After the reaction was completed, it was cooled to room temperature, and filtered under reduced ...

Embodiment 2

[0039] Embodiment 2, preparation of polyethyleneimine modified graphene oxide / epoxy nanocomposite (PEI-GO / EP) of the present invention According to the formula shown in Table 1, weigh modified graphene oxide PEI-GO, with 1 : Ultrasonic dispersion of 1mg / mL in acetone solution, and 70g of TDE-85 epoxy resin (purchased from Hubei Xinrunde Chemical Co., Ltd.) was added to the uniformly dispersed solution after ultrasonication, and mechanically stirred at 65°C for 14h to remove solvent. Put the obtained modified graphene oxide / TDE-85 epoxy resin mixture into a vacuum oven and dry it under vacuum at 65°C until no bubbles are generated in the mixture to remove residual solvent. Weigh 4' diaminodiphenylmethane (DDM) and 3,5-diethyl-2,4 toluenediamine (DETDA) mixed curing agent, add modified graphene oxide / TDE-85 epoxy resin after melting In the solution, electric constant speed stirring makes the curing agent and resin fully mixed. The resulting mixture was placed in a vacuum oven ...

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Abstract

The invention provides polyethyleneimine modified graphene oxide PEI-GO which is obtained by replacing-OH groups of carboxyl groups on the surface of graphene oxide with A groups. Polyethyleneimine modified graphene oxide / epoxy nano composite PEI-GO / EP is further prepared. The polyethyleneimine modified graphene oxide prepared by the method can greatly improve the mechanical properties of the epoxy nano composite material under a low addition dose, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, in particular to a polyethyleneimine-modified graphene oxide and an epoxy nanocomposite thereof. Background technique [0002] Epoxy resin (EP) is an excellent high-strength thermosetting resin and is a widely used matrix material. However, pure epoxy resin is difficult to meet the use requirements in practical applications, so its application is limited to a certain extent. [0003] Resin-based nanocomposites refer to the composite of small-sized nanoscale dispersed phases and resin bases. Due to the unique mechanical properties, large specific surface area and strong surface activity of doped phase nanoparticles, such nanoparticles are dispersed After being in the resin matrix, it can have a strong interaction with the matrix on a microscopic scale, thereby improving the strength, heat resistance and other properties of the composite material with a small amount of addition. [0004...

Claims

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Application Information

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IPC IPC(8): C08K9/04C08K3/04C09C1/46C09C3/10C09C3/08C08L63/00
Inventor 邹华维张雪琴梁梅陈洋
Owner SICHUAN UNIV
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