Abstract
AbstractThe fractal distribution of pore sizes in a poly-4-vinylpyridine resin cross-linked by diamagnetic (Cd2+) or paramagnetic (VO2+, Cu2+) divalent metallic ions has been characterized by small-angle-X-ray scattering, nuclear paramagnetic relaxation and proton-pulsed-field gradient. These complementary techniques show a continuity in the fractal distribution of pore sizes through the same surface fractal dimension, Df = 2.6, over four orders of magnitude between 3 nm to 50 μm. Electron spin resonance yields a direct estimate of the overall fraction of solvent into the adsorption shell of the cross-linked polymer network as well as the dynamics and local viscosity of the solvent in this disordered material.
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