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Dielectric Characterization of Polyurethane Foam Reactivity

«All terms and measuring procedures for the simple description of the kinetics of the polyurethane reaction are derived from factory practice and observations of macroscopic phenomena and are based on visual observations as a function of time». The dielectric technique describes the reaction on a molecular/ionic basis and allows one to evaluate, more fully, the polyurethane reaction as a continuum. Taken together, the conventional and dielectric measurements provide a more comprehensive understanding of the foaming process and aid formulators and processors in producing better insulation systems. Dielectric curves of conventional rigid polyurethane foam systems will be compared showing the effects of catalyst concentration on the reactivity profile