TETRAMETHYLPOLYARYLATE-POLYARYLATE BLOCK-COPOLYMER - SYNTHESIS AND MISCIBILITY WITH POLYARYLATE AND POLY(STYRENE-CO-ACRYLONITRILE)

Tetramethylpolyarylate-polyarylate (TMPAr-PAr) block copolymers of var ious block lengths were synthesized by the coupling reaction of hydrox y-terminated TMPAr and hydroxy-terminated PAr using triphosgene. The p hase behavior of these block copolymers are discussed based on the the rmal properties observed by differential scanning calorimetry (DSC). T he thermal properties of binary blends of these block copolymers with PAr homopolymer or poly(styrene-co-acrylonitrile) whose acrylonitrile content is 9.5 wt% (SAN 10) were observed by DSC. The compatibilizing effect of the microphase-separated TMPAr-PAr block copolymer in PAr/SA N 10 blends was observed from thermal properties and morphology.