We have used photon correlation spectroscopy to compare the dynamic properties of poly(methacrylic acid) solutions and gels as a function of polymer concentration and degree of crosslinking. The slow diffusive mode, which is frequently observed in aqueous polyelectrolyte solutions, was not found in poly (methacrylic acid) gels or in solutions of branched macromolecules below the gel point. The intensity correlation function of samples at the gel threshold has a logarithmic time dependence ~ t ~ with q~ lying between 0.3 and 0.25, which is consistent with the percolation prediction.
Посилання на статтю:
Dynamic behaviour of semidilute solutions and gels of poly( methacrylic acid ) / C. Konak // Polymer. – 1992. – Vol 33. – P. 2238-2239.