THE DIELECTRIC-CONSTANT NEAR THE LIQUID-LIQUID CRITICAL-POINT FOR POLYSTYRENE IN DIETHYL MALONATE

We have measured the dielectric constant as a function of temperature and frequency near the liquid-liquid critical point of a mixture of polystyrene (molecular weight 1. 02 multiplied by 10**5) in diethyl malonate at the critical composition. The range of the frequency was 20 kHz to 1 MHz. For the one-phase region above the critical point, the range of the temperature was 1. 1 multiplied by 10** minus **5 less than t less than 7. 9 multiplied by 10** minus **2. The dielectric constant in the one-phase region near the critical point shows an anomalous increase of about 0. 3% above the 'background' behavior far from the critical point.