Abstract
AbstractThe precipitation behaviour of polystyrene from solution was studied for the ternary system of polymer/solvent/precipitant, the solvent being toluene or ethyl methyl ketone and the precipitant methanol. The relationships between the efficiency of precipitation and temperature of precipitation, concentration of the solution, molecular weight of the polymer, and the solvent system were investigated. The optimum volume ratio of the polymer solution to precipitant, in order to obtain maximum efficiency of precipitation for a particular system, was derived from graphical plots. The results indicated that the efficiency increases with increasing concentration of the solution, molecular weight of polymer, and thermodynamically “poorer” solvent, but decreases with increasing temperature between 200 K and 300 K. It was also observed that a plot of the efficiency of precipitation versus the volume ratio of polymer solution to precipitant passes through a maximum for all the systems studied. The optimum volume ratio of polymer solution to precipitant exhibits a similar behaviour just as in the case of the efficiency of precipitation. Information obtained from this study enables one to select the best combination of the parameters affecting precipitation, in order to produce a high yield of precipitate of polystyrene at a relatively low cost of solvent and precipitant for a particular temperature of precipitation.
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