Synthesis and characterisation of polyesters based on s-triazine

Various polyesters were synthesised by stirred interfacial polycondensation of 2-(N-piperidine)-4,6-bis-(naphthoxy-3-carbonylchloride)-s-triazine (PNC CT) with each of the aromatic and aliphatic diols: bisphenol-A (BPA), bisph enol-C (BPC), bisphenol-S (BPS), phenolphthalein (Ph), catechol (C), resorc inol (R), hydroquinone (Hq), ethylene glycol (EG), and 1,4-butanediol (Bu-1 ,4). Interfacial polycondensation of PNCCT with BPA was investigated in det ail in order to select optimum reaction conditions. The yield of polyesters varies from 63 to 76%. The polyesters are soluble in methylated solvents s uch as dimethyl formamide, dimethyl sulfoxide, methanol etc. The reduced vi scosity for polyesters, determined with a 1 g/dl solution in dimethyl forma mide at 25 +/- 3 degrees C was found to br in the range 0.340-0.628 dl/g. A ll the polyesters were characterised by IR spectra. The densities of. the p olyesters, determined using the suspension method at 25 +/- 3 degrees C, ra nge between 1.118 and 1.208 g cm(-3). The overall reactivity of diols, base d on reduced viscosity values, was found to decrease in the following order : PEBPA > PEPh > PEBPC > PER > PEHq > PEC > PEBPS > PEEG > PEBu-1,4 The thermal stability of polyesters, based on various temperature character istics, was found to decrease in the following order: PEPh > PER > PEHq > PEEG > PEEPS > PEBPA > PEBPC > PEC (C) 2000 Elsevier Sc ience Ltd. All rights reserved.