Abstract
SANS and light scattering experiments have been performed on partially neutralized poly(acrylic acid) (PAA) solutions and swollen network with various cross-link densities. The ensemble-averaged intensity of light scattered from gels was measured by a procedure that allows the scanning of many independent speckles across the detector. For all investigated samples, the scattered light intensity was found to be independent of the scattering wave vector q in contrast with the behavior observed in neutral gels. SANS shows a peak in the structure factor, revealing the existence of microstructure at a small scale (∼100 A)
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