Suspension polymerization and characterization of NPMI/St heat-resistant modifier

NPMI/St copolymer was synthesized by a suspension method.A small amount of MAH was used in the monomers.Air atmosphere and nitrogen atmosphere were compared.The characterization of the copolymers was measured by element analysis,DSC,TGA,HPLC,color view and so on.The copolymer exhibits excellent properties.Its glass transition temperature is more than 213 ℃.The residue of NPMI is less than 300 ppm.And the yellow index is 50.