New approach to nanocomposites of polyimides containing polyhedral oligomeric silsesquioxane for dielectric applications

Low dielectric constant nanocomposites of polyintides with grafted methacrylate side chains containing polyhedral oligomeric silsesquioxane (POSS) were successfully synthesized by thermally initiated free-radical graft copolymerization of methacrylcyclopentyl-POSS (MA-POSS) with the ozone-preactivated poly(arnic acid), followed by thermal imidization. The dielectric constant of the film can be tuned by varying the molar ratio of the grafted MA-POSS side chains in the copolymer. (C) 2004 Elsevier B.V. All rights reserved.