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Method for preparing graphene oxide monolayer modified polyacrylonitrile nanofiber membrane

A nanofiber membrane, polyacrylonitrile technology, applied in fiber processing, textiles and papermaking, non-woven fabrics and other directions, can solve the problems of low graft density of graphene oxide, unguaranteed fiber bonding strength, difficult to promote production and application, etc. Achieve the effect of good practical value and potential value, mild experimental conditions, and simple method

Inactive Publication Date: 2017-08-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the small number of active points on the surface of the fiber, the graphene oxide grafted in the multi-scale structure prepared by this method has a small density, uneven distribution, and the bonding strength with the fiber cannot be guaranteed. Difficult to promote production application
At the same time, none of the above methods can carry out molecular level arrangement, regulation and design at the interface.

Method used

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  • Method for preparing graphene oxide monolayer modified polyacrylonitrile nanofiber membrane
  • Method for preparing graphene oxide monolayer modified polyacrylonitrile nanofiber membrane
  • Method for preparing graphene oxide monolayer modified polyacrylonitrile nanofiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of polyacrylonitrile nanofiber membrane comprises the steps:

[0027] Step 1: Accurately weigh 0.4g of polyacrylonitrile powder, dissolve it in 5ml of DMF and magnetically stir in a constant temperature water bath at 60°C for 12h to obtain a transparent and homogeneous spinning solution of 0.08g / ml.

[0028] Step 2: Adjust the spinning parameters as positive voltage 7v, negative voltage -8v, spinning speed 0.5ml / h, and spinning distance 18cm.

[0029] Step 3: Prepare the polyacrylonitrile nanofiber membrane by electrospinning method, then let it stand for 10 minutes, and then put it into a constant temperature drying oven at 37° C. to dry to obtain the polyacrylonitrile nanofiber membrane. figure 1 It is the SEM picture of the unmodified polyacrylonitrile nanofiber membrane.

Embodiment 2

[0031] The preparation of graphene oxide spreading solution comprises the steps:

[0032] First, 3.0 ml of a 1.0 mg / ml graphene oxide aqueous solution was prepared, then 15.0 ml of methanol was added to the above solution, and stirred for 20 min to obtain a graphene oxide spreading solution with a final concentration of 0.167 mg / ml.

Embodiment 3

[0034] The preparation of monomolecular layer graphene oxide comprises the steps:

[0035] Take 10.0ml of the above-mentioned graphene oxide spreading solution, and carefully spread it drop by drop on the water surface in the LB tank. The area of ​​the tank is 10*20cm, and let it stand for 20 minutes. After the methanol on the water surface is completely volatilized, move the sliding barrier at a speed of 1.0cm / min, when the distance to the sliding barrier is 1cm, stop moving, stand still, and wait for the self-assembly of monomolecular layer graphene oxide film to form.

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Abstract

The invention relates to a method for preparing a graphene oxide monolayer modified polyacrylonitrile nanofiber membrane. The method comprises the following steps: (1) preparing a polyacrylonitrile spinning solution, and performing electrostatic spinning to obtain a polyacrylonitrile nanofiber membrane; (2) preparing a graphene oxide spreading solution, then spreading the graphene oxide spreading solution on the surface of water to obtain monolayer graphene oxide, and compressing a sliding barrier to obtain a graphene oxide thin film; and (3) transferring the graphene oxide thin film on the surface of water onto the polyacrylonitrile nanofiber membrane through a film drawing machine to obtain the graphene oxide monolayer modified polyacrylonitrile nanofiber membrane. According to the method, molecular level regulation and control, arrangement, assembly and modification of graphene oxide on the surface of polyacrylonitrile are realized, molecular levels on the surfaces of polyacrylonitrile nanofibers are modified, and the method can be widely applied to the fields of textiles, biological medicines, functional materials, water treatment and the like, and has a very high practical value and potential value. The method is simple to operate and mild in condition, and the preparation process is nontoxic and pollution-free.

Description

technical field [0001] The invention belongs to the field of preparation of functional materials, and in particular relates to a method for preparing a graphene oxide monomolecular layer modified polyacrylonitrile nanofiber membrane. Background technique [0002] Graphene, a material that "changes the 21st century", has become one of the hotspots in the field of material science research because of its excellent mechanical and conductive properties. Taking the excellent mechanical properties of graphene as an example, its modulus can reach 1Tpa, and its tensile strength can reach as high as 240Gpa, which is the strongest material known at this stage. The discovery of graphene provides a new opportunity for the development of nanofiber reinforcements. The surface of graphene oxide has abundant functional groups and good dispersion, so it is easy to form a more ideal interface bonding state and prepare high-performance graphene oxide-reinforced composite materials. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/43D06M11/74
Inventor 聂华丽杨慧琴陈德强
Owner DONGHUA UNIV
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