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Preparation method for graphene based compound hydrogel modified with poly (N-isopropylacrylamide)

A technology of isopropylacrylamide and composite hydrogel, which is applied in the field of graphene hydrogel preparation, can solve problems such as inability to form three-dimensional graphene materials, and achieve high mechanical strength, high electrical conductivity, and broad application space Effect

Inactive Publication Date: 2012-05-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For two-dimensional graphene sheets, this problem can be effectively solved by surface modification, and this method will also inhibit the interaction of π bonds, so that the graphene skeleton structure cannot be formed to obtain three-dimensional graphene materials

Method used

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  • Preparation method for graphene based compound hydrogel modified with poly (N-isopropylacrylamide)
  • Preparation method for graphene based compound hydrogel modified with poly (N-isopropylacrylamide)
  • Preparation method for graphene based compound hydrogel modified with poly (N-isopropylacrylamide)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 50mg of graphite oxide and add 50ml of deionized water, ultrasonically disperse at 200W power for 2 hours, after the dispersion is uniform, then weigh 2.5g of N-isopropylacrylamide and 250mg of potassium persulfate into the above graphite oxide aqueous solution, in a nitrogen atmosphere Continue ultrasonic dispersion for 60min (200W) under protection. Put the above precursor solution into the reaction kettle, raise the temperature to 100° C., and react for 12 hours. After the reaction is finished, the hydrogel product can be taken out.

[0027] figure 1 It is the X-ray diffraction pattern of product, and the diffraction peak in the figure shows that graphite oxide is reduced into graphene. figure 2 It is the Fourier transform infrared spectrum of the product, and it can be seen that poly-N-isopropylacrylamide is contained in the composite hydrogel. image 3 It is a scanning electron microscope photo of the product. It can be seen that the hydrogel product cons...

Embodiment 2

[0029] Weigh 100mg of graphite oxide and add 50ml of deionized water, ultrasonically disperse at 300W power for 1.5h. Continue ultrasonic dispersion for 45min (300W) under protection. Put the above precursor solution into the reaction kettle, raise the temperature to 150°C, and react for 16h. After the reaction is finished, the hydrogel product can be taken out.

[0030] X-ray diffraction and Fourier transform infrared measurements showed that the composite hydrogel contained graphene and poly-N-isopropylacrylamide components, respectively. It was observed by scanning electron microscopy that the hydrogel product consisted of multi-layer graphene sheets to form a network skeleton structure, and poly-N-isopropylacrylamide was distributed in the intercalation of graphene sheets and between the skeleton structures. The graphene-based composite hydrogel product has high mechanical strength, good chemical stability, high electrical conductivity, and has a reversible swelling / de-s...

Embodiment 3

[0032] Weigh 200mg of graphite oxide and add 50ml of deionized water, ultrasonically disperse at 400W power for 1h, after the dispersion is uniform, then weigh 2g of N-isopropylacrylamide and 20mg of potassium persulfate into the above graphite oxide aqueous solution, protect Continue ultrasonic dispersion for 30min (400W). Put the above precursor solution into the reaction kettle, raise the temperature to 200°C, and react for 8 hours. After the reaction is finished, the hydrogel product can be taken out.

[0033] X-ray diffraction and Fourier transform infrared measurements showed that the composite hydrogel contained graphene and poly-N-isopropylacrylamide components, respectively. It was observed by scanning electron microscopy that the hydrogel product consisted of multi-layer graphene sheets to form a network skeleton structure, and poly-N-isopropylacrylamide was distributed in the intercalation of graphene sheets and between the skeleton structures. The graphene-based ...

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Abstract

The invention relates to a preparation method for a graphene based compound hydrogel modified with poly (N-isopropylacrylamide). The preparation method comprises the following steps: (1) at room temperature, adding graphite oxide in water, ultrasonically dispersing so as to form a graphite oxide aqueous solution, and then adding monomer N-isopropylacrylamide and trigger potassium peroxydisulfate,and ultrasonically dispersing under a nitrogen atmosphere, thereby forming a precursor solution; and (2) performing hydro-thermal reaction on the precursor solution, after the reaction, cooling the precursor solution to room temperature, and taking out a product. The preparation method is simple in process and short in reaction time, thereby being suitable for industrial production. The graphene based compound hydrogel prepared according to the preparation method has the advantages that the graphene is served as a three-dimensional network skeleton, the mechanical strength is high, the chemical stability is excellent, the conductivity is high, the reversible swelling / deswelling response to ambient temperature is achieved, the change in conductivity is triggered, and the application prospect in the fields of electronics, biomedicine, and the like is wide.

Description

technical field [0001] The invention belongs to the field of graphene hydrogel preparation, in particular to a preparation method of poly-N-isopropylacrylamide modified graphene-based composite hydrogel. Background technique [0002] Two-dimensional graphene materials have the characteristics of ultra-thin, ultra-strong, and super-conductive properties, and have been widely used in nanoelectronic devices, composite materials, energy storage, and biomedicine. In recent years, scientists have discovered that three-dimensional graphene materials assembled from graphene sheets can be prepared using a variety of methods. This material maintains the excellent electrical conductivity of graphene sheets. The three-dimensional skeleton structure assembled by π bonds has high mechanical strength and good chemical stability. Based on the above characteristics, this new type of three-dimensional graphene material is regarded as an excellent energy storage material. Y.Zhu et al. report...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/54C08F2/44C08K9/00C08K3/04
Inventor 李耀刚侯成义张青红王宏志
Owner DONGHUA UNIV
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