Preparation of New Poly(ether imide) Film and Related Graphene Nanocomposites

In the present study, a novel pyridine-based diamine monomer (BAPPP) was designed and synthesized to overcome a number of common difficulties in processing of polyimides, namely, lack of solubility and very high glass transition temperature. The exact chemical structure of synthesized diamine was confirmed using FTIR and HNMR spectroscopy and also elemental analysis. BAPPP was polycondensed with 4,4 -(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and resulted poly(amic acid) was thermally imidized to prepare polyimide film. Three different graphene-based nanocomposites were also prepared containing 1, 2, and 3 wt% graphene nanosheets. Thermal, mechanical and physical properties of prepared PI and nanocomposite films were investigated. TEM method was applied to study the morphology of samples and dispersion and distribution behavior of graphene nanosheets in the PI matrix.