Caracterisation de la structure des membranes lonomeres (NAFION) par diffusion de rayons X aux petits angles

摘要

Ionomer membranes, like Nafion used in fuel cell, present a nano-phase separation between domains with different ionic concentrations. Up to now models describe the ionic domains as spheres of about 40 A diameter. Small angles X-ray scattering studies over a large range of wave vectors, lead to a new assumption for th Nafion structure, describing the polymer aggregation as elongated objects surrounding by the ionic charges.