POLYMERIZATIONS BY PHASE-TRANSFER CATALYS TS .19. SYNTHESIS AND CHARACTERIZATION OF POLY(ESTERTHIOCARBONATE)S AND POLY(ESTERTHIOCARBONATE)S

In this work we describe the synthesis of poly(estercarbonates) and po ly(esterthiocarbonates) derived from the monomers 4-hydroxyphenyl-3-hy droxybenzoate (I) and 3-hydroxyphenyl-3-hydroxybenzoate (II) and phosg ene and thiophosgene respectively. Polymers were synthesized under pha se transfer catalysis conditions and using several ammonium salts as c atalysts and dichloromethane as solvent. For polymers derived from 4-h ydroxyphenyl-3-hydroxybenzoate (I) the more effective catalyst was TEB AC due to the hydrophilic character, being the other catalysts ineffec tive. For polymers derived from 3-hydroxyphenyl-3-hydroxybenzoate (II) catalysts showed no influence, and the phase transfer process is only due to an increase of the yields. All polymers were insoluble in the reaction media, which limited their growth.