Method for preparing polyamide-amine in-situ intercalation graphene composite material

A polyamidoamine, in-situ intercalation technology, which is applied in the field of preparation of dendrimer in-situ intercalated graphene to achieve the effect of good product stability

Active Publication Date: 2012-03-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The excellent performance of graphene needs to be realized through its specific application, and a huge challenge in the application process is that graphene, due to its high surface energy and strong Π-Π interaction, is stable in solid phase or in common solvents. Very prone to irreversible reunions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of graphene suspension: ultrasonically disperse natural flake graphite in 1-cyanoethyl-2-ethyl-4-methylimidazole acetonitrile solvent for 1 h, the ultrasonic power is 400 w, the mass of graphite and acetonitrile The volume ratio was 2 mg / ml, and after standing still for 24 hours, the supernatant was collected by centrifugation to obtain a clear graphene suspension.

[0027] (2) The above-prepared graphene suspension, methanol solvent and 0.16 mol of ethylenediamine were fully mixed, 1.2 mol of methyl acrylate was added dropwise, and the mixture was continuously stirred and reacted for 24 hours at 30° C. under a nitrogen atmosphere. Distill under reduced pressure to remove excess solvent and methyl acrylate to obtain 0.5 generation polyamidoamine intercalation graphene composite material, then add methanol and drop in 1.0mol ethylenediamine to continue the reaction for 30h, remove excess organic solvent and excess ethylenediamine by distillation under redu...

Embodiment 2

[0030] (1) Preparation of graphene suspension: ultrasonically disperse colloidal graphite in 4,5-dicyanoimidazole acetonitrile solvent for 3 hours, the power of ultrasonic is 200 W, the mass-volume ratio of graphite to acetonitrile is 5 mg / ml, let stand After 24 hours, the supernatant was collected by centrifugation to obtain a clear graphene suspension.

[0031](2) The above-prepared graphene suspension, methanol solvent and 0.16 mol of ethylenediamine were fully mixed, 1.2 mol of methyl acrylate was added dropwise, and the mixture was continuously stirred for 24 hours at 10°C under a nitrogen atmosphere. Distill under reduced pressure to remove excess solvent and methyl acrylate to obtain 0.5 generation polyamidoamine intercalation graphene composite material, then add methanol and drop in 1.0mol ethylenediamine to continue the reaction for 30h, remove excess organic solvent and excess ethylenediamine by distillation under reduced pressure Amines yield 1.0 generation PAMAM i...

Embodiment 3

[0034] (1) Preparation of graphene suspension: ultrasonically disperse the expanded graphite in the ethanol solvent of 4,5-diphenylimidazole for 3 hours, the ultrasonic power is 200 w, the mass-volume ratio of graphite to ethanol is 10 mg / ml, let stand After 24 hours, the supernatant was collected by centrifugation to obtain a clear graphene suspension.

[0035] (2) Fully mix the graphene suspension prepared above, methanol solvent and 0.16mol ethylenediamine, add dropwise 1.2mol methyl acrylate, stir continuously for 24 hours at 20°C under a nitrogen atmosphere, and distill off excess solvent and methyl acrylate The 0.5 generation polyamidoamine intercalated graphene composite material was obtained by ester, then methanol and 1.0mol ethylenediamine were added dropwise to continue the reaction for 30h, and the excess organic solvent and excess ethylenediamine were distilled off under reduced pressure to obtain the 1.0 generation PAMAM intercalated graphene Complex. Add methan...

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Abstract

The invention discloses a method for preparing a polyamide-amine in-situ intercalation graphene composite material. The method comprises the following steps of: (1) dispersing graphite in an imidazole-compound-containing organic solvent with ultrasonic, and centrifuging to obtain multi-layer graphene suspension; and (2) polymerizing to generate polyamide-amine in the multilayer graphene by adopting an in-situ polymerization method to prepare the polyamide-amine in-situ intercalation graphene composite material. According to the method, natural graphite is directly subjected to ultrasonic exfoliation in the organic solvent to obtain single-layer or multi-layer graphene suspension, the original sp2 structure of the graphene is slightly damaged because an oxidation step is not carried out, the polyamide-amine in-situ intercalation graphene composite material is prepared by using an in-situ polymerization method, so that graphene laminas are spread, interlamellar spacings are enlarged, the polyamide-amine on the surface of the graphene functionally prevents agglomeration of the graphene laminas, the graphene laminas are uniformly dispersed, and the product has good stability and is hardly precipitated.

Description

technical field [0001] The invention relates to a preparation method of dendrimer in-situ intercalation graphene, in particular to a preparation method of polyamidoamine functionalized graphene. Background technique [0002] In 2004, Geim's group at the University of Manchester obtained a new type of two-dimensional atomic crystal - graphene for the first time through mechanical exfoliation. 2 The theoretical thickness of the two-dimensional honeycomb lattice composed of hybrid connections is only 0.35 nm, which is the thinnest two-dimensional material discovered so far. The special structure of graphene makes it exhibit excellent physical and chemical properties. For example, graphene has the highest strength among known materials; its carrier mobility reaches 1.5×10 4 cm 2 ·V -1 ·s -1 , which is twice that of the currently known indium antimonide material with the highest mobility. Under certain conditions (such as low-temperature quenching, etc.), its mobility can e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 刘岚刘孔华贾德民罗远芳
Owner SOUTH CHINA UNIV OF TECH
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