Prior works show exfoliated layered silicate reinforcement improves polymer composite properties . However , achieving full clay exfoliation in high performance thermoset polyimides remains a challenge . This study explores a new method of clay exfoliation , which includes clay intercalation by lower molecular weight PMR monomer under conditions of low and high shear and sonication , clay treatments by aliphatic and aromatic surfactants , and clay dispersion in primary , higher molecular weight PMR resin . Clay spacing , thermal , and mechanical properties were evaluated and compared with the best results available in literature for PMR polyimide systems .