Preparation method of polyvinyl alcohol-oxidized graphene nano-belt composite thin film

Abstract

The invention relates to a preparation method of a polyvinyl alcohol-oxidized graphene nano-belt composite thin film. The preparation method includes the following steps that 1, 50 ml of concentrated sulfuric acid and 0.1 g of multiwalled carbon nanotubes are added into a 150 ml three-opening flask, the materials are stirred for 2 hours till the mixture looks like a uniform black solution from the appearance, 0.1-0.5 g of KMnO4 is slowly added into the solution, the materials are firstly stirred for 1 h at room temperature, the materials are heated to 70 DEGC for reacting for 1 h, reaction liquid is poured into 500 ml of deionized water, centrifugation precipitation is carried out, and after the materials are washed with a diluted hydrochloric acid solution and deionized water multiple times, an oxidized graphene nano-belt is obtained; 2, the oxidized graphene nano-belt is ultrasonically dispersed for 30 min in 5 ml of deionized water, 1 g of polyvinyl alcohol is dissolved in 10 ml of deionized water, the materials are stirred to be dissolved at the temperature of 90 DEG C, the two solutions are mixed, the content of the oxidized graphene nano-belt is 0.2-3 wt%, ultrasonic treatment is carried out for 30 min, a evenly-mixed composite solution is obtained, then the even mixed solution is poured to a flat substrate, drying is carried out at the temperature of 60 DEG C till the mass is constant, and the composite thin film is obtained. The physical performance of the composite thin film is greatly improved.

Description

Technical field [0001] The invention belongs to the technical field of materials, and specifically relates to a method for preparing a polyvinyl alcohol-graphene oxide nanoribbon composite film. Background technique [0002] Carbon nanotubes (CNT) can be regarded as cylinders formed by curling graphene and seamlessly connected. According to the number of curled graphene layers, CNTs can be divided into single-walled carbon nanotubes (SWNT) and multi-walled There are two major categories of carbon nanotubes (MWNT). Because of its excellent mechanical properties and excellent conductivity, CNT has attracted widespread interest in the scientific and industrial circles since it was discovered. In particular, its extremely high strength and hardness make it an ideal one-dimensional filler for the reinforcement of polymer composite materials. Generally, SWNT is considered to be more suitable for polymer reinforcement because of its smaller size, higher specific surface area, and bett...

AI Technical Summary

Problems solved by technology

However, previous work mainly focused on the dispersion and surface modification of MWNTs, so the shortcoming of the small effective interface area has not been resolved.