▎ 摘　　要

NOVELTY - Blend composition comprises graphene nanoparticles and a poly(styrene-co-methylmethacrylate). The content ratio (wt/wt) of styrene to methyl methacrylate in the poly(styrene-co-methylmethacrylate) is 50-90/20-40. The graphene nanoparticles are dispersed in the poly(styrene-co-methylmethacrylate), and the graphene nanoparticles are thermally oxidized and/or microwaved irradiated and comprise at least one surface modification consisting of carboxy group, carbonyl group, epoxy group or hydroxy group. USE - The blend composition is useful for preparing poly(styrene-co-methylmethacrylate)/graphene nanocomposites. ADVANTAGE - The blend composition exhibits: an intensity level of 2000-2200 D band at 1357 cm-1 and an intensity level of 2050-2200 G band at 1583 cm-1; storage modulus of 1800-2200 MPa at 100 degrees C and 1400-1800 MPa at 40 degrees C; glass transition temperature of 92-106 degrees C (claimed); and enhanced interaction between graphene nanoparticles and poly(styrene-co-methylmethacrylate).