COHESION PARAMETERS FOR SURFACES, PIGMENTS, AND FILLERS

Relationships between the parameters of cohesion and surface energy, a nd their practical significance are discussed. Cohesion parameters (so lubility parameters) con be used with full theoreticol justification t o characterize many surfaces including pigment and filler surfaces, su bstrates, coatings, plastics, etc, in addition to the binder or polyme r used in a given product. Important relationships between the hinder and the surroundings then become obvious. Cohesion parameter data are given for some newer pigments. The use of cohesion parameters in a tot al characterization clearly shows how the single point concepts of the critical surface tension and the wetting tension fit into a larger en ergy concept. A test for on-site evaluation of the degree of contamina tion is discussed. Hansen solubility parameters and Prigogine's corres ponding states theory of polymer solutions ore mutually confirming. Th e mathematical expressions of both these theories contain the some con stant '4', a number which has been confirmed experimentally by well ov er a thousand solubility (cohesion) porometer correlations.