Light scattering study of partially ionized polyacrylic acid systems : comparison between gels and solutionsReport as inadecuate




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Abstract : Static and quasielastic light scattering experiments have been performed on the reaction bath of partially neutralized polyacrylic acid solutions and gels. The intensity scattered from gels is independent on the scattering wavevector, giving thus evidence that the gels are homogeneous at the scale of the wavelength of the light, contrary to what is generally observed in neutral gels. The comparison of the time and ensemble averages of the autocorrelation function of scattered light intensity shows that the gels behave with respect to that experiment as ergodic media. The variations of the intensity scattered from gels and solutions, with the ionization degree and the polymer concentration were found to be in good agreement with those predicted from simple theoretical arguments. The variations of the cooperative diffusion with these same parameters were found similar for gels and solutions.





Author: A. Moussaid J. Munch F. Schosseler S. Candau

Source: https://hal.archives-ouvertes.fr/



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