Scale-invariant cluster structure of the chemical network of epoxy-phenol polymer

The concentration dependences of the relative viscosity of a mixture of precondensates of epoxy-4,4′-isopropylidenediphenol and phenol-formaldehyde resins in a Cellosolve solution were examined. The surface tension curves at the solution-air interface at concentrations c = 0.5–45 % were obtained. The optimal concentration modes of preparation of coatings from solutions of precondensates of the resin mixture were calculated on the basis of the cluster model. Using electron microscopy with silver chloride surface decoration, the cluster structure parameters of the chemical network of the epoxy-phenol polymer were determined for coatings with high protective performance.