▎ 摘　　要

NOVELTY - Producing polymethacrylimide (PMI) foam, comprises uniformly mixing a reactant comprising 30-80 wt.% methacrylic acid, and 20-70 wt.% acrylonitrile, and/or 1-3 wt.% acrylamide or their derivatives, as a weight ratio of the components, where the components contain a polymerization initiator, a nucleating agent and a foaming agent in a mixing vessel (3) so that it forms a reaction mixture (4); obtaining a crosslinked foamable prepolymerization product by exposing the reaction mixture to a UV light arriving from a UV source (6) during a pre-polymerization; and obtaining a copolymer PMI block by performing the polymerization reaction of the prepolymerization product in a container at 20-80 degrees C, and subsequently producing foam with a temperature of 100-260 degrees C. USE - The method is useful for producing PMI foam (claimed) which is used in e.g. thermal insulation, packaging, mechanical support, aeronautics, defense, aerospace applications, structural materials, and/or thermal insulation applications for transportation vehicles. ADVANTAGE - The method: provides polymer foam that has density of 40-140 kg/m3, pore size of 50-700 mu m, compressive strength of 0.7-8 MPa, and electrical conductivity of greater than 10-3 S/cm; and shorten the synthesizing time in the polymethacrylimide foam production process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a polymer foam obtained by the PMI foam production method. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the PMI production method. Liquid components (1) Vessel (3) Reaction mixture (4) UV source (6) Glass plate (9)