Miscible blends of poly(benzoyl paraphenylene) and polycarbonate

Substituted poly(paraphenylene! derivatives (PX) have recently gained inter est due to their unique properties [1-5]. They are amorphous thermoplastics with relatively modest glass transition temperatures (T-g similar to 150 d egreesC), are soluble in various common organic solvents, and yet possess t he strongest mechanical properties of any amorphous thermoplastic [6]. Howe ver, the blend behavior of these polymers is relatively unexplored. Here we report the phase behavior of PX and various thermoplastic blends and highl ight the PX and polycarbonate (PC) blends which were found to possess a low er critical solution temperature (LCST) as determined through enthalpy rela xation and cloud point measurements. The morphology and storage moduli of t he PX/PC blends have been observed in both the single phase and two phase r egimes. (C) 2001 Published by Elsevier Science Ltd.