Porous multi-hollow flexible composite nanofiber membrane material and preparation method thereof

Abstract

The invention relates to a porous multi-hollow flexible composite nanofiber membrane material and a preparation method thereof. The method is to prepare a porous multi-hollow flexible composite nanofiber membrane through coaxial electrospinning; the outer layer solution of coaxial electrospinning is prepared by sacrificial Composed of high molecular polymer, retained high molecular polymer and solvent A; the inner layer solution of coaxial electrospinning is composed of sacrificial high molecular polymer, which can generate both semiconducting properties and low surface energy substances during the spinning process. material and solvent B; then remove the sacrificial polymer in the porous multi-hollow flexible composite nanofiber membrane to obtain a membrane material composed of porous multi-hollow nanofiber stacks, the porous multi-hollow nanofiber has multiple hollow The three-dimensional through-hole micro-nano structure from the pipe and the surface to the hollow; the membrane material of the present invention has good flexibility and mechanical strength, and solves the problems of brittleness and low mechanical strength of porous composite fiber materials and single hollow fiber materials.

Description

Porous multi-hollow flexible composite nanofiber membrane material and preparation method thereof technical field The invention belongs to the technical field of nanofiber membrane materials, and relates to a porous multi-hollow flexible composite nanofiber membrane material materials and methods for their preparation. Background technique In recent years, nanofiber membrane materials have been widely used due to their large specific surface area, high porosity and three-dimensional network structure. It is widely used in new energy, sensing, filtration, desalination, aerospace and other fields. Chinese patent CN101445963A published A method for preparing ultrafine polymer fibers by wet electrospinning technology, the fiber diameter can be controlled from nanometers to micrometers class. Designing synthetic porous fibers can increase the specific surface area of ​​the fibers. Chinese patent CN103225135A combines pore-forming agent calcium carbonate, high The spi...

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Problems solved by technology

Titanium dioxide coatings prepared by this method have poor adhesion to carbon fiber substrates, resulting in reduced long-term performance

Chinese patent CN104452268A discloses a method for preparing a fiber composite material loaded with titanium dioxide nanoparticles, but the loading of titanium dioxide in this method is less (4.5%)

Chinese patent CN109346690A prepares carbon fiber in advance, and then attaches zinc oxide to the surface of carbon fiber through hydrothermal reaction as the negative electrode material of lithium ion battery, but the adhesion between zinc oxide and carbon fiber is poor

[0005] It can be seen that in the prior art, metal oxide nanoparticles are directly mixed with fiber materials, but there are still problems of uneven dispersion of nanoparticles, low loading capacity, poor adhesion to fibers or brittle fibers.

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