Polycarbonate/phenoxy blends: Physical behavior and development of interchange reactions in melt‐processing conditions

The miscibility of the polycarbonate of bisphenol A with the polyhydroxyether of bisphenol A was analyzed using differential scanning calorimetry and the, results are compared with the torque data obtained using a Brabender Plasticorder. The possibility of interchange reactions was analyzed by means of the observation of the melt‐viscosity variation versus processing time in the mixer‐bowl. These reactions form graft‐copolymers that develop into crosslinked copolymers at higher residence times. It was also shown that the speed of these reactions depends on the processing temperature. The variation produced on the glass‐transition temperature because of branching was also analyzed.