A method for preparing fluorine-containing hierarchical porous structure polymer based on etching polylactic acid

A technology of structural polymers and porous polymers, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of long etching polylactic acid, complicated operation steps, high energy consumption, etc., and increase porosity and specific surface area Effect

Active Publication Date: 2021-05-14
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has disadvantages, such as figure 1 As shown, the scanning electron microscope pictures of the porous material obtained before and after the treatment by the sodium hydroxide method, from the scanning electron microscope pictures before and after etching, fine particles and square crystals appear on the inner wall of the porous material after etching, which is due to residual It is caused by the crystallization of the sodium hydroxide solution in the porous material after volatilization. In order to remove these particles, further extraction treatment is required. The operation steps are complicated, the energy consumption is high, and the etching of polylactic acid takes a long time.

Method used

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  • A method for preparing fluorine-containing hierarchical porous structure polymer based on etching polylactic acid
  • A method for preparing fluorine-containing hierarchical porous structure polymer based on etching polylactic acid
  • A method for preparing fluorine-containing hierarchical porous structure polymer based on etching polylactic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] An oil phase was prepared by mixing 2.0020 parts of trifluoroethyl methacrylate, 1.0100 parts of divinylbenzene, 0.2030 parts of b246, 0.7501 parts of PLA-11000 and 0.0311 parts of azobisisobutyronitrile (AIBN). 18.00 parts of an aqueous calcium chloride solution was used as the aqueous phase. Stir the oil phase at a speed of 400 rpm, slowly drop the water phase into the oil phase, stir and mix thoroughly, increase the stirring speed to 500 rpm after the addition, and stir for 30 minutes. The temperature is raised to 65°C in the reactor to initiate polymerization, and the reaction is stopped after 24 hours of polymerization, and the polymerization product is taken out and dried to obtain a fluorine-containing porous polymer material. The obtained porous material has an average pore diameter of 2.90 μm and a density of 0.1783 cm 3 / g, the porosity is 89.55%, and the internal specific surface area is 17.9376m 2 / g.

[0054] Take 0.3484g of the obtained porous material ...

Embodiment 2

[0062] An oil phase was prepared by mixing 2.0612 parts of hexafluorobutyl methacrylate, 1.0027 parts of divinylbenzene, 0.2988 parts of b246, 0.7500 parts of PLA-11000 and 0.0309 parts of azobisisobutyronitrile (AIBN). 18.00 parts of an aqueous calcium chloride solution and 0.0410 parts of potassium persulfate were mixed to obtain an aqueous phase. Stir the oil phase at a speed of 400 rpm, slowly drop the water phase into the oil phase, stir and mix thoroughly, increase the rotation speed to 500 rpm and continue stirring for 30 minutes after the addition is complete. Then the emulsion was transferred into the reactor and the temperature was raised to 65°C to initiate polymerization, and the reaction was stopped after 24 hours of polymerization, and the polymerization product was taken out and dried to obtain a fluorine-containing porous polymer material. The obtained porous material has an average pore diameter of 2.77 μm and a density of 0.1698 cm 3 / g, the porosity is 92.7...

Embodiment 3

[0067] An oil phase was prepared by mixing 2.0020 parts of trifluoroethyl methacrylate, 1.0100 parts of divinylbenzene, 0.3030 parts of b246, 1.0020 parts of PLA-11000 and 0.0310 parts of azobisisobutyronitrile (AIBN). 18.00 parts of an aqueous calcium chloride solution was used as the aqueous phase. Stir the oil phase at a speed of 400 rpm, slowly drop the water phase into the oil phase, stir and mix thoroughly, increase the stirring speed to 500 rpm after the addition, and stir for 30 minutes. Transfer the emulsion into a reactor and raise the temperature to 65°C to initiate polymerization, stop the reaction after 24 hours of polymerization, take out the polymer product and dry it to obtain a fluorine-containing porous polymer material.

[0068] The obtained porous material has an average pore diameter of 2.65 μm and a density of 0.1683 cm 3 / g, the porosity is 91.85%, and the internal specific surface area is 21.1712m 2 / g.

[0069] Take 0.3508g of the obtained porous mate...

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Abstract

The present invention combines the etching method and the high internal phase emulsion template method, and the steps of preparing the fluorine-containing porous polymer rich in hierarchical pore structure based on etching polylactic acid are as follows: disperse the polylactic acid, surfactant and initiator in the fluorine-containing In the oil phase composed of monomer and crosslinking agent, the water phase is added dropwise into the oil phase under mechanical stirring to form a stable water-in-oil type fluorine-containing high internal phase emulsion. Then move it into a polyethylene bottle for polymerization reaction, take it out after a period of time and dry it to obtain a porous material. After removing polylactic acid after the Soxhlet extraction step, a fluorine-containing porous polymer with a higher specific surface area and a hierarchical pore structure is obtained. The preparation method of the present invention is environmentally friendly, simple and easy to implement. On the basis that the adjustment of the pore size can be realized by changing the content or molecular weight of the polylactic acid, the number of through holes is further increased by etching the polylactic acid and a nanoscale pore structure is generated in the pore wall. Increased its porosity and specific surface area.

Description

technical field [0001] The invention relates to a preparation method of a fluorine-containing hierarchical porous polymer, in particular to a method for preparing a fluorine-containing hierarchical porous polymer based on etching polylactic acid. Background technique [0002] Nanoporous substrates have always been a key research direction in material science due to their unique properties such as high specific surface area, strong adsorption and catalytic properties, and dielectric properties. The advantages of mesoporous, obtain multi-level porous structure materials, through the modification and modification of the pore surface, endow the material with special functions and uses, in photonic crystals, optical devices, sensors, adsorption separation, catalysts and catalyst carriers, capacitor electrode materials, Lightweight structural materials, nanoreactors, energy storage and drug loading have broad application prospects. [0003] There are many methods to prepare porou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/02C08F220/24C08J9/26B01J20/26B01J20/30
CPCB01J20/261C08F283/02C08J9/26C08J2201/0422C08J2351/08C08F220/24
Inventor 耿兵王永康梁吉虹陈健
Owner UNIV OF JINAN
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