Cross-Over Concentration in Polydisperse Polymer Solutions

Abstract

ABSTRACT:Correlation length and osmotic compressibility of blends of narrow distribution polystyrenes in benzene solutions were measured by dilute and semidilute regimes. Universal curves were obtained for correlation length and osmotic compressibility. These curves were the same as those of monodisperse polystyrenes. The cross-over concentration C* of polydisperse systems can be calculated by the equation, 1IC* = l:;(w;/Ct), where w, and Cf are the weight fractions and cross-over concentrations of i-th components, respectively.