Abstract
Abstract The angular dependence of the intensity of SANS by semi-dilute solutions of polystyrene in deuterated cyclohexane near θ temperature was measured in order to determine the density-density correlation function of polymer segments. The concentration dependence of the measured screening length was analyzed based on a simple statistical theory in which only the contributions of the diagrams of chain type are taken into account. This theory enables us to obtain separately the binary and ternary cluster integrals of polymer segments for each temperature. It was found that the binary cluster integral changes its sign at about 40°C, the θ temperature, whereas the ternary cluster integral is almost independent of temperature near the θ point. Slightly below the θ temperature there occurred, for each concentration, a compensation point at which polymer coils become ideal due to the opposite contribution of the two cluster integrals.
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