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A kind of emulsion gel-based polyacrylonitrile/carbon porous material and preparation method thereof

A technology of carbon porous material and polyacrylonitrile, which is applied in the field of porous materials to achieve the effects of small density, easy large-scale production and practical application, and high porosity

Active Publication Date: 2017-12-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many precedents for the preparation of porous materials by the emulsion template method, an oil-in-water emulsion is prepared by dissolving polyacrylonitrile in a salt solution, and the salt in the continuous phase is removed by the emulsion gel method to lower the freezing point of the continuous phase to facilitate freeze-drying. method not yet reported

Method used

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  • A kind of emulsion gel-based polyacrylonitrile/carbon porous material and preparation method thereof
  • A kind of emulsion gel-based polyacrylonitrile/carbon porous material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0034]Dissolve 0.12g of polyacrylonitrile with a molecular weight of 80,000 in 2mL of 60% (mass concentration, the same below) zinc chloride solution under stirring at 70°C. After the polyacrylonitrile is completely dissolved, stop stirring and cool to room temperature , to obtain a polyacrylonitrile salt solution; add 0.12 g of acrylamide monomer, 5 mg of potassium persulfate, and 1.2 mg of N,N-methylenebisacrylamide to the solution in sequence, and disperse it evenly by ultrasonication. Then add 40 µL Tween-20, and add 8 mL of cyclohexane four times (2 mL each time), and emulsify by hand to prepare a homogeneous emulsion with an oil-water ratio of 4:1. The emulsion was polymerized in an oil bath at 70° C. for 12 hours to obtain an emulsion gel. The emulsion gel was taken out from the glass bottle, soaked in 1L of deionized water for 36 hours, frozen in the refrigerator, and then placed in a freeze dryer for 48 hours to freeze-dry to obtain a polyacrylonitrile porous material...

Embodiment 2

[0036] Dissolve 0.12g of polyacrylonitrile with a molecular weight of 80,000 in 2mL of 60% zinc chloride solution under stirring at 70°C. After the polyacrylonitrile is completely dissolved, stop stirring and cool to room temperature to obtain a polyacrylonitrile salt solution. ; Add 0.16g of acrylamide monomer, 6mg of ammonium persulfate, and 2.4mg of N,N-methylenebisacrylamide to the solution in sequence, and disperse it evenly by ultrasonication. Then add 40 µL Tween-40, and add 6 mL of cyclohexane three times (2 mL each time), and emulsify by hand to prepare a homogeneous emulsion with an oil-water ratio of 3:1. The emulsion was polymerized in an oil bath at 65° C. for 18 hours to obtain an emulsion gel. The emulsion gel was taken out from the glass bottle, soaked in 1L of deionized water for 36 hours, frozen in the refrigerator, and then placed in a freeze dryer for 48 hours to freeze-dry to obtain a polyacrylonitrile porous material. The polyacrylonitrile porous materia...

Embodiment 3

[0038] Dissolve 0.16g of polyacrylonitrile with a molecular weight of 70,000 in 2mL of 50% sodium thiocyanate solution under stirring at 70°C. After the polyacrylonitrile is completely dissolved, stop stirring and cool to room temperature to obtain polyacrylonitrile salt Solution; add 0.12g of acrylamide monomer, 5mg of potassium persulfate, 1.2mg of N,N-methylenebisacrylamide, and 0.04g of hydrophilic silica particles to the solution in sequence, and disperse it evenly by ultrasonication. Then add 8 mL of benzene four times (2 mL each time), and emulsify by hand to prepare a homogeneous emulsion with an oil-water ratio of 4:1. The emulsion was polymerized in an oil bath at 70° C. for 12 hours to obtain an emulsion gel. The emulsion gel was taken out from the glass bottle, soaked in 1 L of deionized water for 48 hours, frozen in liquid nitrogen, and then placed in a freeze dryer for 48 hours to freeze-dry to obtain a polyacrylonitrile porous material. The polyacrylonitrile po...

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Abstract

The present invention discloses an emulsion gel based polyacrylonitrile / carbon porous material and a preparation method thereof. The method comprises the following steps: with emulsion gel as a template, dissolving polyacrylonitrile in a salt solution of zinc chloride or sodium thiocyanate, then adding a water-soluble monomer, an initiator, a crosslinking agent and an emulsifier into the obtained solution, carrying out uniform dispersing, then adding an oil phase, and carrying out emulsification so as to prepare an emulsion; and placing the emulsion at a certain temperature, allowing the water-soluble monomer in a continuous phase to polymerize so as to prepare the emulsion gel, then placing the emulsion gel into deionized water, carrying out soaking, removing salt in the continuous phase, carrying out freeze drying so as to prepare a polyacrylonitrile porous material, and carrying out cyclization and carbonization so as to prepare a porous material. The preparation method provided by the invention has the advantages of simple preparation process, cheap raw materials and mild preparation conditions; meanwhile, the prepared polyacrylonitrile / carbon porous material has the advantages of low density, high porosity, large specific surface area, good connectivity of internal pores, etc., and has potential application prospects in the fields of catalyst carriers, oil-water separation, etc.

Description

technical field [0001] The invention belongs to the field of porous materials, in particular to an emulsion gel-based polyacrylonitrile / carbon porous material and a preparation method thereof. technical background [0002] Polymer / carbon porous composites with low density, high specific surface area and good internal connectivity have been widely used in many special fields such as energy storage, catalyst carrier, electrochemistry, aerospace, marine decontamination, etc. One of the research hotspots of workers. According to the properties of the internal pores of porous materials, they can be divided into closed-cell porous materials and open-cell porous materials. The pores inside the closed-cell porous material are separated by the matrix material and are independent of each other without connectivity; while the pores inside the open-cell porous material are connected to each other. Due to the connectivity of the internal pores, the open-cell porous material not only fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C04B38/00C08F220/56C08F222/38C08J9/26
CPCC01P2004/03C01P2006/12C04B38/0045C08F220/56C08J9/26C08J2333/20C08F222/385
Inventor 王朝阳张光照
Owner SOUTH CHINA UNIV OF TECH
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