PREPARATION AND PROPERTIES OF POLYARYLATES BOTH FROM 2,2'-BIBENZOYL CHLORIDE AND BISPHENOLS AND FROM BIPHENYL-2,2'-DIOL AND AROMATIC DICARBOXYLIC-ACID CHLORIDES

Polyarylates having inherent viscosities up to 1.02 dL/g were synthesized both by the phase-transfer catalyzed two-phase polycondensation of 2,2'-bibenzoyl chloride with various bisphenols and by the high-temperature solution polycondensation of biphenyl-2,2'-diol with aromatic dicarboxylic acid chlorides. All the polyarylates were amorphous and soluble in a variety of organic solvents including N,N-dimethylformamide, N-methyl-2-pyrrolidone, chloroform, m-cresol, and pyridine. Transparent and flexible films of these polymers could be cast from the chloroform solutions. These polyarylates had glass transition temperatures in the range of 120-250-degrees-C and began to lose weight at around 380-degrees-C in air.