Here, a semiempirical method for predicting the solubility limit of polymer solutions at high temperatures is proposed. This method has been developed for infinite-chain-length polymers dissolved in Θ solvents. The development is based on several data for polystyrene solutions, and it has been tested also for polyethylene and polypropylene solutions. This method only requires the critical density and temperature of the solvent for the prediction of the hightemperature miscibility limit. The prediction appears to be reasonable considering the simplicity of the correlation model and gives better prediction than earlier comparably simple methods.

No abstract

No abstract

No abstract

We investigate lysozyme-lysozyme and lysozyme-salt interactions in electrolyte solutions using a molecular-thermodynamic model. An equation of state based on the statistical mechanical perturbation theory is applied to describe the interactions. The perturbation term includes a new square-well potential of mean force, which implies the information about the lysozyme surface and salt type. The attractive energy of the potential of mean force is correlated with experimental cloud-point temperatures of lysozyme in various solution conditions. The same attractive energy is used to predict osmotic pressure of a given system with no additional parameters. The new potential shows a satisfactory improvement in understanding the interactions between lysozymes in aqueous salt solutions.