Novel method for modifying graphene with polymer

A graphene and polymer technology, applied in the field of surface modification and dispersion of graphene, can solve the problems of easy damage, weakened transmission, unstable composite structure, etc., and achieves the effect of strong universality

Inactive Publication Date: 2015-12-16
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The covalently modified graphene is connected to the polymer in a covalent bond, which has a strong force, but the formation of the covalent bond makes the graphene surface sp 2 Hybridized carbon becomes sp 3 Hybridization, which destroys the original electronic structure of graphene, will weaken the transmission of electrons or phonons on the surface of graphene, limiting the application of modified graphene
Although the non-covalent bonding method preserves the electronic structure of carbon on the surface of graphene to the greatest extent, graphene and polymers are combined by intermolecular forces such as hydrogen bonds, van der Waals forces, ionic bonds, and π-π interactions. The force is easily destroyed when the external conditions are changed, so the load transfer efficiency of the graphene sheet should be low in theory, and the structure of the composite material formed is extremely unstable.

Method used

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  • Novel method for modifying graphene with polymer

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Experimental program
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Effect test

Embodiment 1

[0022] The first step is to weigh 0.4g dopamine (DA) and dissolve it in 10mL DMF, and add 2-bromo-2-methylpropionyl bromide (BiBB) and triethylamine (TEA) in an equimolar amount to BiBB, and the molar ratio of BiBB to dopamine 1:1, through N 2 Oxygen was removed for 15 minutes, and stirred for 12 hours in an ice-water bath.

[0023] The second step is to weigh 0.1g of graphene oxide (GO), add 50mL of water, ultrasonically disperse for 30min, add it into the reaction system, and stir at room temperature for 12h. After the reaction is completed, the product is centrifuged and washed with deionized water until the supernatant is colorless, and the obtained solid is dispersed in deionized water again, and freeze-dried to obtain the macromolecular initiator RGOPDA-Br.

[0024] The third step is to dissolve 40 mg of initiator RGOPDA-Br in 4 mL of DMF and ultrasonically disperse for 1 h, add 4 mL of styrene (St), 110 μL of initiator ligand N, N, N', N, 'N"-pentamethyldiethylene Bas...

Embodiment 2

[0026] In the first step, weigh 0.4g DA and dissolve it in 10mL DMF, add BiBB and TEA in an equimolar amount to BiBB, the molar ratio of BiBB to DA is 2:1, pass N 2 Oxygen was removed for 15 minutes, and stirred for 12 hours in an ice-water bath.

[0027] The second step is to weigh 0.1gGO, add 50mL water, ultrasonically disperse for 30min, add it to the reaction system, and stir at room temperature for 12h. After the reaction is completed, the product is centrifuged and washed with deionized water until the supernatant is colorless, and the obtained solid is dispersed in deionized water again, and freeze-dried to obtain the macromolecular initiator RGOPDA-Br.

[0028] The third step is to dissolve 40 mg of initiator RGOPDA-Br in 4 mL of DMF and ultrasonically disperse for 1 h, add 4 mL of St, 110 μL of initiator ligand PMDETA, 30 mg of CuBr, and copper wire, remove water and oxygen in the system by freezing and thawing pump circulation, and place React in an oil bath at 90°C...

Embodiment 3

[0030] In the first step, weigh 0.4g DA and dissolve it in 10mL DMF, add BiBB and TEA in an equimolar amount to BiBB, the molar ratio of BiBB to DA is 2:1, pass N 2 Oxygen was removed for 15 minutes, and stirred for 12 hours in an ice-water bath.

[0031] The second step is to weigh 0.1gGO, add 50mL water, ultrasonically disperse for 30min, add it to the reaction system, and stir at room temperature for 12h. After the reaction is completed, the product is centrifuged and washed with deionized water until the supernatant is colorless, and the obtained solid is dispersed in deionized water again, and freeze-dried to obtain the macromolecular initiator RGOPDA-Br.

[0032] The third step is to dissolve 40mg of initiator RGOPDA-Br in 4mL of DMF and ultrasonically disperse for 1h, add 4mL of tert-butyl acrylate (tBA), 110μL of initiator ligand PMDETA, 30mg of CuBr, and copper wire, and remove it from the system by freezing and thawing pump circulation. water and oxygen, placed in a...

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Abstract

The invention discloses a novel method for modifying graphene with polymer. By introducing polydopamine and combining covalent modification with non-covalent modification, the method increases the stability of the modified product structure under the premise of ensuring the integrity of the graphene structure. Firstly, by utilizing the strong adhesion of dopamine, the dopamine is self-polymerized to form a film on the surface of a graphene sheet, moreover, 2-Bromo-2-methylpropionyl bromide (BiBB) as common initiator for atom transfer radical polymerization (ATRP) is grafted on the dopamine by amidation, at the same time, graphene oxide (GO) is partially reduced by the dopamine (DA), and thereby graphene macroinitiator RGO@PDA-Br is obtained. Polymeric monomer is then added, so that the ATRP of the polymeric monomer is initiated on the surface of the graphene, and thereby a polymer-modified graphene material is obtained. By controlling conditions such as monomer concentration and reaction time, the novel method can obtain modified graphene materials with different densities and chain lengths of polymer grafted on the surfaces, meeting the characteristics of controllable/living ATRP. In addition, the feasibility and universality of the novel method for modifying graphene with polymer put forward by the invention are applicable to various monomers suitable for ATRP.

Description

technical field [0001] The invention relates to the field of surface modification and dispersion of graphene, in particular to a method for modifying graphene by grafting polymer chains on the surface of graphene through "grafting from". Background technique [0002] Before the discovery of graphene, the superior properties of polymer-carbon-based material composites have led to extensive research on such composite materials, especially carbon nanotube-polymer composites. As a new member of the carbon family, graphene can also be used as an assembly material to compound with polymers. However, on the road to the application of graphene-based composite materials, an important problem is faced, that is, how to improve its compatibility with solvents and polymer matrices. In order to solve this problem, the most effective method is to functionalize graphene with polymers, and the functionalization methods can be divided into two types according to their combination methods: no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00
Inventor 罗静赵芳巧费小马刘晓亚
Owner JIANGNAN UNIV
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