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The miscibility of random copolymers of o‐chlorostyrene and p‐chlorostyrene [P(oClS‐pClS)] with polystyrene (PS) has been studied by differential scanning calorimetry (DSC). A miscibility ‘‘window’’ was found, extending in copolymer composition from about 68 to 98 mole % o‐chlorostyrene at a temperature of 150 °C. The maximum in the miscibility window occurred at approximately 170 °C and a composition of 83 mole % o‐chlorostyrene. This result differs only slightly from theoretical predictions based on interaction parameters previously calculated from miscibility behavior in blends of poly(2,6‐dimethyl‐1,4‐phenylene oxide) with P(oClS‐pClS), poly(styrene‐co‐o‐chlorostyrene) and poly(styrene‐co‐p‐chlorostyrene). The implication of this result for the numerical values of the six interaction parameters required to describe these blends is discussed.