Method for preparing Nafion nanometer filter film

Abstract

The invention provides a method for preparing a Nafion nanometer filter film. The method comprises the following steps of: directly dissolving polyoxyethylene with a molecular weight being 90,000 into 5 wt% of Nafion solution, so as to prepare a solution with a polyoxyethylene concentration being 0.3-1.0 wt%; stirring the solution for 20 hours at a room temperature until the solution is transparent and uniformly dispersed, so as to obtain a uniform electro-spinning solution; placing the electro-spinning solution in an electrode rod groove, and adjusting the rotating speed of an electrode rod to be 0.9 rpm, a spinning voltage to be 20-50 kV and a distance between the spinning electrode rod and a receiving plate to be 16-20 cm; drying at a temperature for more than 24 h; and scanning an electron microscope to observe a nanometer filter state. According to the method provided by the invention, a small amount of PEO (polyoxyethylene) is added into the Nafion, so that the uniform and continuous nanometer fiber film is electro-spun. The method has high application values on aspects of a fuel cell, a catalyst, a sensor and the like. The method provided by the invention is simple; and the continuous fiber can be spun by adding the small amount of the PEO and the diameter distribution is even.

Description

(1) Technical field [0001] The invention relates to a composite material, in particular to a preparation method of a Nafion nanofiber membrane. (2) Background technology [0002] The preparation of polymer nanofiber membranes by electrospinning is based on the principle that polymer flow produces jets under high-voltage electric fields. There is an electrostatic interaction between the polymer solution or melt between the nozzle and the receiving plate. When the voltage increases and the electric field strength reaches a certain value, the electrostatic interaction increases, and the polymer solution or melt overcomes the surface tension and sprays out from the nozzle. When the electrostatic force is greater than the cohesive force of the polymer, it splits into multiple small polymer streams before reaching the receiving plate, and at the same time, due to the volatilization of the solvent, a polymer nanofibrous film can be obtained on the receiving plate. Nanofibers prepa...

AI Technical Summary

Problems solved by technology

The phase separation method is to obtain nano-polymer fibers through several processes of polymer dissolution, gelation, extraction, coagulation and drying, and its disadvantage is that it takes a long time

The template synthesis method is to form nanofibers through the polymerization and deposition of molecular monomers in the pores of the porous template. The disadvantage is that it cannot be continuous and the process of removing the template is complicated.

Images