Predicting Enthalpies of Interfacial Bonding of Polymers to Reinforcing Pigments

Abstract

The adsorption and adhesion of polymers to inorganic pigments depends very much on the degree of acid-base bonding between these materials. The H of acid-base bonding at the surface of silica particles has been measured calorimetrically during adsorption from neutral solvents, and has been measured by infrared spectral shifts of the carbonyl stretching frequency of esters and ketones resulting from adsorption on silica.The results obtained by these two methods are in excellent agreement, and allow accurate determination of the Drago C and E constants for the acidic silanol groups of silica (C =1.08 0.04 and E =4.36 0.2). With these values, predictions of the energetics of polymer adhesion to silica can be made quite reliably.

Analysis of interactions in multicomponent polymeric systems: The key-role of inverse gas chromatography

“…The acidity and the basicity of a substance are given by parameters expressing covalent (C) and electrostatic (E) contributions. The Drago approach has been much favoured by Fowkes [21][22][23]34,[132][133][134][135][136]. Using calorimetric data, C and E parameters have been obtained for a variety of organic solids and inorganic solids that are relevant to polymer systems.…”