METHOD FOR PREPARING GRAPHENE-MODIFIED POLYMETHYL METHACRYLATE COMPOSITE MATERIAL HAVING ULTRA-HIGH CONDUCTIVITY

摘要

The present invention relates to a method for preparing a graphene-modified polymethyl methacrylate complex having ultra-high conductivity. The method comprises the following steps: (1) firstly, slightly oxidizing an expanded graphite to obtain an expanded graphite intercalation compound (EGIC); (2) modifying the EGIC with a silane coupling agent to obtain an mEGIC; (3) adding the mEGIC, methyl methacrylate and dibenzoyl peroxide to an 1-methyl-2-pyrrolidone solvent, stirring the mixture at room temperature for a period of time, and then warming to a reaction temperature for polymerization reaction; after the reaction, pouring the product into methanol for centrifugation, washing and vacuum drying, thus obtaining a graphene-modified polymethyl methacrylate complex. In the present invention, when the mEGIC content reaches 10wt%, the glass transition temperature of the complex can be increased to be 18°C higher than that of polymethyl methacrylate, the elastic storage modulus is increased by approximately 300%, and the electrical conductivity can reach 1700 S/m or more.