▎ 摘　　要

NOVELTY - A composite material comprises sulfur-containing polymer prepared by anionic ring-opening copolymerization reaction of sulfur-containing carbon monomer, epoxy monomer and acid anhydride under action of catalyst, where the epoxy monomer is selected from one or more of trifluoropropylene oxide, 3-(2,2,3,3-tetrafluoropropoxy)-1,2-propylene oxide, hexafluoropropylene oxide, heptafluorobutyl ethylene oxide, octafluoropentyloxy-1,2-propylene oxide, nonafluoropentyl ethylene oxide, perfluoro-2-methyl-2,3-epoxypentane, tridecafluoroheptyl ethylene oxide, glycidyl ether hexafluorononyl ether, naphthyl glycidyl ether, anthryl glycidyl ether, azophenyl glycidyl ether and biphenyl glycidyl ether. USE - Composite material with low dielectric constant and low dielectric loss, used for manufacturing Fifth-generation (5G) mobile phone antenna materials (claimed). ADVANTAGE - The composite material has low dielectric constant and low dielectric loss under high frequency, and the polymer main chain has no water-absorbing group. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing composite material with low dielectric constant and low dielectric loss, which involves (1) blending sulfur-containing carbon monomer, epoxy monomer, acid anhydride, catalyst and optionally added solvent, and carrying out anionic ring-opening polymerization to obtain sulfur-containing polymer after post-treatment, (2) blending sulfur-containing polymer prepared in step (1), optionally added polymer additive, and optionally added nanoporous material, and hot-pressing.