Thermally induced phase separation in homogeneous blends of poly(2,6‐dimethyl‐1,4‐phenylene oxide) with poly(o‐fluorostyrene‐co‐p‐chlorostyrene) and with poly(o‐fluorostyrene‐co‐o‐chlorostyrene)

摘要

AbstractThe phase separation behavior of initially compatible blends of poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) with poly(o‐fluorostyrene‐co‐p‐chlorostyrene) poly(oFS‐co‐pCIS) and with poly(o‐fluorostyrene‐co‐o‐chlorostyrene) poly(oFS‐co‐oCIS) was studied by DSC. It was found that copolymers of poly(oFS‐co‐pCIS) containing between 15 and 62 mol pCIS have shown no phase separation after annealing at temperatures up to 320°C. It was also observed that blends containing this copolymer with 74 mol pCIS show phase separation at 250°C, which depended on blend composition. Additionally, all PPO/poly(oFS‐co‐oCIS) blends exhibit phase separation after annealing to a temperature of 230°C. Thermal degradation of the polymer blends was