Cyanoethyl cellulose based high-dielectric flexible nano-composite film and preparation method thereof

Abstract

The invention discloses a cyanoethyl cellulose based high-dielectric flexible nano-composite film and a preparation method thereof, and aims to provide a cyanoethyl cellulose based high-dielectric flexible nano-composite film which has high dielectric constant, low dielectric loss, good mechanical properties and good thermal stability as well as a preparation method of the nano-composite film. The cyanoethyl cellulose based high-dielectric flexible nano-composite film is prepared through the steps as follows: a solution is prepared from cyanoethyl cellulose serving as a matrix as well as ceramic filler and conductive filler which serve as auxiliaries, the film is subjected to film casting and forming, and the film is prepared. The cyanoethyl cellulose based high-dielectric flexible nano-composite film and the preparation method thereof have the following benefits: raw materials have wide sources and are renewable; a product has high dielectric constant and lower dielectric loss, can be applied to the industries of electronics, motors and cables, and has certain application prospect in the fields of artificial muscles, wave-absorbing materials, drug release and the like; the product has glossy surface, certain flexibility, good mechanical properties and good thermal stability; the production method is safe, the technological process is simple, the production cost is low, and the market prospect is broad.

Description

technical field [0001] The invention relates to a cyanoethyl cellulose-based high-dielectric flexible nanocomposite film and a preparation method thereof, belonging to the field of materials. Background technique [0002] Polymer-based composites with high dielectric constants have attracted increasing attention due to their wide applications in high-energy storage devices, capacitors, brakes, etc. Polymers are commonly used for energy storage due to their high breakdown strength, low dielectric loss, good processability, and low cost. However, the dielectric constant of ordinary polymers is very low, therefore, it becomes an important issue to improve the dielectric constant of polymers on the basis of retaining their own good properties. A simple method is to add ceramic fillers with high dielectric constant to the polymer matrix, but with this method, it is difficult to obtain composite materials with a dielectric constant higher than 100 even with a high content of cera...

AI Technical Summary

Problems solved by technology

Hu Zhiwei et al. prepared ethylene-vinyl carboxylate / barium titanate / carbon nanotube nanocomposites. The barium titanate used was modified with a silane coupling agent. Although the dielectric constant of the composite material was significantly increased near the percolation threshold, But its dielectric loss is also significantly improved (Hu Zhiwei et al. Effect of multi-walled carbon nanotubes on the dielectric and thermal conductivity of polymer / barium titanate nanocomposites[J]. Insulation Materials, 2013,46(5):58 -61,65.)