Spreading rate, polymer droplets

The spreading rate of a polymer droplet on a surface has been measured (363,364). The diffusion constant was at least an order of magnitude smaller than that of the bulk. The monomer—surface friction coefficient for polystyrene has been measured on a number of surfaces and excellent... 

In addition to incorporating a cationic material into the composition, deposition of unmodified silicones onto hair may be influenced by varying the viscosity of the silicone polymer or the particle size of the emulsion droplet (102-110). Quantitatively, the spreading of liquids on solid surfaces was discussed by Dodge, and is given by the following equation, which demonstrates the dependence of spreading rate on the droplet volmne and viscosity ... 

As mentioned above, the most important adjuvants are surface active agents of the anionic, nonionic or zwitterionic type. In some cases polymers are added as stickers or antidrift agents. The production of spray droplets (from a spray nozzle) is determined by the adsorption of surfactants under dynamic conditions (with time in the region of 1 ms). The droplet adhesion to the target surface and its wetting and spreading is also determined by the dynamic contact angle which is also determined by the rate of surfactant adsorption to the surfeice. Above the critical micelle concentration (cmc), the supply of monomers is determined by the relaxation time of micelle formation and its breakdown. The dynamics of surfactant adsorption is determined by the monomer concentration and the diffusion coefftcient of the surfactant molecules to the interface. 

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