Time-dependent interactions in polymer and liquid crystal systems

The Surface Forces Apparatus technique was used to study the effects of adsorption time, force-measuring rate, and repeated compression-decompression on the interactions between high molecular weight polystyrenes ;Interaction forces were also measured between surfactant-coated mica surfaces in tetradecane containing polyethylene-propylene. Two molecular weights, ;In these model systems, we are able to distinguish between and accurately measure the magnitude of bridging and depletion attraction. The results agree well with theoretical predictions.;The normal forces, thin film-viscosity, and lateral (frictional) forces were measured for two surfaces interacting across thin films of a liquid crystal, 4-n-octyl-4...