Abstract
AbstractThe kinetics of the gel formation of phenol sulfonic acid‐formaldehyde‐water mixture is studied by small angle scattering of X‐rays. The X‐ray scattering properties of the gels in equilibrium with water are also investigated. The experiments are evaluated in terms of the random two phase model (correlation function of local fluctuations of electron density: C(r) = exp(−r/a). The data show that the X‐ray scattering of the swollen resin is caused by two kinds of inhomogeneities. The values of the characteristic length of the corresponding correlation functions are about 10 · 10−8 cm and 50 · 10−8 cm respectively. This finding supplements the structural picture of these gets developed on the basis of measurements of freezing‐point depression, light scattering and elastic properties.
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