Synthesis and physico-chemical properties of aromatic polyesters containing S-triazine rings in the main chain

Several polyesters have been synthesized by high temperature poly-condensat ion of 2-(beta -naphthylamino)-4,6-bis(naphthoxy-3-carbonyl chloride)-S-tri azine (NANCCT) with each of the aromatic diols: bisphenol-A (BPA), bispheno l-C (BPC), 1,5- and 1,7-dihydroxynaphthalene (DHN-1,5 and DHN-1,7), 1,4-dih ydroxyanthraquinone (DHAQ-1,4), phenolphthalein (Ph), catechol (C), resorci nol (R) and hydroquinone (Hq) and characterized by solubility, density, vis cosity measurement, IR spectra and thermogravimetric analysis. All the poly esters are amorphous and soluble at high temperature in acetone, dimethylfo rmamide, dimethylsulphoxide, dimethylacetamide etc. The polymer has reduced viscosities in the range 0.509-0.740 dl g(-1) in dimethylformamide at 30 d egreesC. The thermal stability of polyesters, based on various temperature characteristics, is found to decrease in the following order: PEDHN-1,5 >PE DHN-1,7>PER> PEHQ=PEPh > PEBPC=PEC > PEBPA.