Preparation method of conductive macromolecule non-covalent functionalized graphene modified electrokinetic energy conversion polymer material

Abstract

The invention discloses a preparation method of a conductive macromolecule non-covalent functionalized graphene modified electrokinetic energy conversion polymer material. according to the method, conductive macromolecules are non-covalent functionalized onto the surface of nano-graphene; and then, the conductive macromolecule non-covalent functionalized graphene nano-material undergoes ultrasonic-assisted dispersion into an electrokinetic energy conversion polymer solution so as to finally obtain a conductive macromolecule non-covalent functionalized graphene / electrokinetic energy conversion polymer composite material. The electro-stimulate response intelligent polymer composite material obtained by the method has high dielectric constant and high electrodeformation value. When content of poly(3,4-ethylenedioxythiophene): polystyrolsulfon acid non-covalent functionalized graphene nanofiller is 3%, dielectric constant of the modified polyurethane dielectric elastomer intelligent material reaches up to 350 at room temperature and at the frequency of 1000 Hz, dielectric loss is 0.20, and loss modulus is 200 MPa. Under the action of a 32.2 MV / m electric field, electrodeformation value in the thickness direction reaches 162%. Performance of the material provided by the invention is far more excellent than performance of a regular nano-ceramic or nano-conductive filler modified intelligent polymer composite material.

Description

technical field [0001] The invention relates to the field of stimuli-responsive intelligent polymer composite materials, in particular to a method for non-covalently modifying graphene-modified electrokinetic energy conversion polymer materials by conductive polymers. Background technique [0002] Electrokinetic energy conversion polymer materials are a new type of flexible smart materials that can produce large size or shape changes under the excitation of an electric field. They have the characteristics of electrical energy-mechanical energy conversion. It has broad application prospects in many fields such as actuators, audio and ultrasonic sensors, biomedical sensors, electromechanical transducers and energy harvesters, robots, micro-motor systems, and artificial muscles. Compared with functional materials such as electroactive ceramics and shape memory alloys, electrokinetic energy conversion polymers have large deformation, high electromechanical response performance, ...

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Problems solved by technology

According to the percolation theory, the dielectric constant of polymer-based composites filled with conductive particles can be significantly increased when the filler content reaches the percolation threshold, and the percolation threshold filler content is very small (<5%), and graphite with high conductivity Graphene nanosheets are ideal conductive fillers, but the surface of graphene nanosheets is in a hydrophobic state, and there is a strong Van der Waals force between graphene sheets, which is easy to agglomerate, so that in the electrokinetic energy conversion polymer material matrix The formation of conductive channels in the material leads to a sharp increase in the dielectric loss and loss modulus of the material, and a decrease in the electrical breakdown strength, which limits the application of the material.

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