ABSTRACT
It is well known that polyimides (PIs) are a class of thermally stable polymers that are related to their stiff aromatic backbones. In the past decades, PIs have been extensively studied owing to both scienti–c and industrial interests. In membranebasedtechnologies, PI membranes have been used for along time for awide variety of applications due to their excellent thermal stability, high mechanical strength and modulus, good –lm forming ability, and superior chemical resistance [1]. These merits are just what are required for the polymer electrolyte membrane (PEM) materials employed in fuel cell systems.
