▎ 摘　　要

NOVELTY - Preparation of a polymer composite involves forming a reaction mixture comprising rigid rod monomers and oligomers comprising repeat units derived from the rigid rod monomer, adding graphene nanoparticles to the mixture, and polymerizing the mixture to form a polymer composite comprising a polymer and graphene nanoparticles dispersed in the polymer. The polymer comprises at least 50 wt.% rigid rod polymer derived from benzobisoxazole-containing repeat unit (I) or (II), and the graphene nanoparticles comprises less than 25 planar graphene sheets in a stacked arrangement. USE - Preparation of polymer composite used as sheets and fibers. Uses include but are not limited to bullet-proof vest, body armor, vehicular armor, ballistic protection equipment, tire cord for automobile tire, machine belt, ceramic, and laminate for aircraft. ADVANTAGE - The method efficiently provides polymer composite having uniform, aligned distribution of graphene nanoparticles and excellent tensile strength, modulus, stiffness, thermal stability, electrical or thermal conductivity, and electromagnetic and radio-frequency shielding, due to the presence of rigid rod polymers. DETAILED DESCRIPTION - Preparation of a polymer composite involves forming a reaction mixture comprising rigid rod monomers and oligomers comprising repeat units derived from the rigid rod monomer and having 5-10 repeat units on average, adding graphene nanoparticles to the reaction mixture, and polymerizing the reaction mixture to form a polymer composite comprising a polymer and graphene nanoparticles dispersed in the polymer. The polymer comprises at least 50 wt.% rigid rod polymer repeat units, and the graphene nanoparticles on average, comprises less than 25 planar graphene sheets in a stacked arrangement. The rigid rod polymer repeat units are derived from benzazole-containing repeat unit of formula (I) or (II). ring A1=6-membered aryl or heterocyclyl; Y'=-O-, -S- or -NR'; R'=H, hydrocarbyl, optionally substituted hydrocarbyl, or acyl;and X1,X2=bond, para-ordered aryl or para-ordered heterocyclyl.