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Method for preparing through-hole polymer porous aquagel by using graphene oxide (GO)

A porous hydrogel and polymer technology, applied in the field of materials, can solve problems such as limiting the application of porous hydrogels, and achieve the effects of low cost, good swelling performance and adsorption performance, and wide applicability

Inactive Publication Date: 2015-07-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, it is precisely because of the high adsorption energy of solid particles at the droplet interface that the stability of the emulsion is high, and it is difficult to coalesce during the polymerization process, and the solid particles form a thicker barrier layer at the droplet interface, so the polymerization The volume shrinkage in the process and the mechanical action in the post-treatment process are difficult to break through this obstacle, so often only porous materials with closed-pore structure can be obtained by polymerization, which greatly limits the application of porous hydrogels in many fields

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  • Method for preparing through-hole polymer porous aquagel by using graphene oxide (GO)
  • Method for preparing through-hole polymer porous aquagel by using graphene oxide (GO)

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Embodiment 1

[0021] 1. Disperse graphene oxide (GO) in water to prepare an aqueous solution with a mass fraction of 0.5%. The average size of the GO sheet is 1000 nm. The ionic surfactant cetyltrimethylammonium bromide (CTAB) was added, and its mass accounted for 6% of the GO mass. The reaction was stirred at room temperature for 1 h, then centrifuged and washed three times, and dried in a vacuum oven at 60 °C for 24 h to obtain the modified GO.

[0022] 2. The above modified GO was ultrasonically dispersed in water for 30 min, and the mass of water was 500 times that of GO; acrylic monomer was added to the aqueous dispersion of GO, and its mass was 360 times that of GO; then cross-linking was added. N,N'-methylenebisacrylamide, the mass of which is 15 times the mass of GO; and potassium persulfate, an initiator, whose mass is 12 times that of GO; and finally water is added to control the mass of GO to account for the total amount of water in the water phase. 0.08% of mass.

[0023] 3. A...

Embodiment 2

[0026] 1. The experimental device and operation are the same as in Example 1, except that the GO aqueous solution in Example 1 was changed to GO ethanol solution, and the average size of GO sheets was changed from 1000 nm to 600 nm; the ionic surfactant cetyltrimethyl Ammonium bromide was changed to amino modifier dodecylamine, 6% of GO mass of lipophilic modifier was changed to 80%, and stirring time of 1 h was changed to 12 h.

[0027] 2. The experimental device and operation are the same as in Example 1, except that the mass of water in Example 1 is 500 times that of GO and changed to 100 times that of GO; the monomer acrylic acid is changed to acrylamide, and its mass is 75 times that of GO; cross-linking The agent N,N'-methylenebisacrylamide was changed to polyethylene glycol diacrylate, and its mass was 4 times that of GO; the initiator potassium persulfate was changed to ammonium persulfate, and its mass was 3 times that of GO ; Control the mass of GO to 0.08% of the to...

Embodiment 3

[0031] 1. The experimental device and operation are the same as in Example 1, except that the GO aqueous solution in Example 1 was changed to GO N, N-dimethylformamide solution, and the average size of GO sheets was changed from 1000 nm to 50 nm; ionic surface activity The agent cetyltrimethylammonium bromide was changed to isocyanate modifier phenyl isocyanate, the mass of lipophilic modifier was changed to 200% of 6% of the mass of GO, and the stirring time was changed from 1 h to 24 h.

[0032]2. The experimental device and operation are the same as in Example 1, except that the mass of water in Example 1 is 500 times that of GO; the monomer acrylic acid is changed to N-vinylpyrrolidone, and its mass is 25 times that of GO ; The crosslinking agent N, N'-methylenebisacrylamide was changed to polyethylene glycol dimethacrylate, and its mass was twice that of GO; the initiator potassium persulfate was changed to azobisisobutyramidine salt Acid, its mass is 1 times the mass of ...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to a method for preparing a through-hole polymer porous aquagel by using graphene oxide (GO). The method mainly comprises the following steps: carrying out surface modification on hydrophilic GO by using an oleophylic modifier, wherein the modified GO is used as a stabilizer of a Pickering emulsion; and adding a monomer, a crosslinking agent, an initiator and a pore-forming agent, emulsifying to obtain an oil-in-water high-inner-phase emulsion, and carrying out continuous phase polymerization on the high-inner-phase emulsion to obtain the through-hole-structure polymer porous aquagel. The method has the advantages of simple preparation process and lower cost. The prepared through-hole polymer porous aquagel has the advantages of controllable pore structure, large pore size (5-200 mu m), large interconnection size (2-70 mu m), favorable permeability, favorable swelling capacity and favorable adsorbability.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a through-hole polymer porous hydrogel by utilizing graphene oxide. Background technique [0002] Hydrogels are hydrophilic but water-insoluble polymers that swell rapidly in water while maintaining their shape and three-dimensional network structure. Due to their unique water absorption, water retention and biomimetic properties, hydrogels are widely used in the fields of controlled drug release, material separation, tissue engineering and so on. However, the low water absorption rate of traditional hydrogels limits its application, while porous hydrogels have a high specific surface area, which greatly improves their use efficiency, and thus receive more and more attention. [0003] The preparation methods of polymer porous hydrogel mainly include phase separation method, foaming method and template method. Among them, the high internal ph...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/56C08F226/10C08F222/38C08F222/20C08F290/06C08F2/44C08K9/04C08K3/04C08J9/28
Inventor 易文媛王海涛杜强国
Owner FUDAN UNIV
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