Polypyrrole porous hollow nano microsphere and preparation method and application thereof

A technology of nano-microspheres and polypyrrole, applied in the field of nanotechnology, can solve problems such as poor application in industrial production, single structure of polypyrrole, toxic and harmful chemicals, etc.

Inactive Publication Date: 2020-11-24

TIANJIN POLYTECHNIC UNIV

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AI-Extracted Technical Summary

Problems solved by technology

At present, the synthesis methods of polypyrrole include electrochemical oxidation polymerization and chemical polymerization. However, the prepared polypyrrole has a single structure and cannot be well applied to industrial production.

In order to prepare polypyrrole with a special structure, researchers have developed a variety of methods including template polymerization, interfacial polymerization, seed polymer...

Abstract

The invention relates to a nano technology and a high polymer technology, and in particular to a polypyrrole hollow nano microsphere with a porous shell and a preparation method and application thereof. The preparation process can be carried out as follows: under an action of ferric chloride serving as an oxidant, pyrrole monomer polymerizes on a surface of nano silicon dioxide template at a low temperature, then hydrofluoric acid is used for etching, a hollow structure is formed after the template is removed, and nano-scale holes are left in the polypyrrole shell layer. The polypyrrole poroushollow nanospheres can be used as fillers for preparing gas separation membranes, pervaporation membranes, nanofiltration membranes and the like.

Application Domain

Semi-permeable membranesDispersed particle separation +2

Technology Topic

PyrroleNanofiltration +13

Image

Examples

Experimental program(4)

Example Embodiment

[0013] Example 1

[0014] A certain amount of Pebax1657 is dissolved in a mixed solution of ethanol/water (70wt%/30wt%), heated at 80°C for two hours, and a certain amount of polypyrrole porous hollow nanospheres are added to the mixed solution. The mixture was poured into a polytetrafluoroethylene mold, placed at room temperature for 24 hours, and vacuum dried in a vacuum oven at 45°C for 24 hours.

[0015] Table 1 Permeation and separation performance of Pebax/polypyrrole porous hollow nanosphere mixed matrix membrane

[0016]

Example Embodiment

[0017] Example 2

[0018] Polyethylene glycol methacrylate (PEGMEA) is used as the monomer, pentaerythritol triacrylate (PETA) is used as the crosslinking agent, and the porous hollow nanospheres of polypyrrole are used as the filling material. A certain amount of photoinitiator is added to The mixed solution is poured into a brown bottle and dispersed evenly by ultrasonic, placed between two glass plates, and the thickness is controlled by copper wire to prepare a series of gas separation membranes. The gas permeability test of the membrane found that N 2 , CH 4 , CO 2 Compared with the original membrane, the permeability performance of the membrane is increased by about 2 times, and its selectivity remains unchanged.

Example Embodiment

[0019] Example 3

[0020] Weigh a certain proportion of polydimethylsiloxane and its crosslinking agent and n-heptane, stir evenly, then add polypyrrole porous hollow nanospheres, stir and ultrasonic, and coat them on the PVDF porous bottom membrane . Place the coated film in a fume hood, evaporate naturally for several hours, and then place it in an oven for thermal crosslinking. The mass ratio of polypyrrole porous hollow nano microspheres to polydimethylsiloxane is 1% to 5%, and the prepared membrane is dried and used for pervaporation. Pervaporation test conditions: vacuum degree of 5mmHg absolute negative pressure on the downstream side, cold well condensation collection; operating temperature on the upstream side is 40°C, and the feed liquid is 5wt% ethanol aqueous solution (mass fraction). Its performance is shown in Table 2.

[0021] Table 2 Ethanol separation performance of polydimethylsiloxane/polypyrrole porous hollow nanosphere mixed matrix membrane

[0022]

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Description & Claims & Application Information

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