Preparation ,Characterization and Thermal Properties of New Aromatic Polyester Based on Di ,Tri and Tetra Hydroxyl Monomers with 4,4Azo Di Benzoic Acid and Adipic Acid

摘要

A series of new aromatic Polyesters were synthesized by polycondensation of various aromatic monomers di ,tri and tetra diols (BCAHPMNM , BHPMB, BHPPB , BPBHP) with Acids(4,4Azo Di benzoic acid and Adipic acid) using dibutyltine dilaurate as Catalyst .all polyesters(P.E1-P.E4)containing pyridine heterocyclic group, aliphatic methylene linkage, and Azo group. The yield of Polyesters varies from 60-85%. All of these new aromatic polyester show very good solubility in common organic solvents , such as (pyridine , CHCl3 , CH2Cl2 , NaOH , H 2 SO 4 , HNO 3 , Acetone , Benzene , DMF , DMSO , THF) without need for heating. Thermal analysis of polyesters by thermo gravimetric analysis (TGA) reveals that these Aromatic polyesters possess thermal stability. Monomers and polyesters characterized by FT-IRand 1 HNMRspectrosticcopy.