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 (PNCCT) with each of the aromatic and aliphatic diols: bisphenol-A (BPA), bisphenol-C (BPC), bisphenol-S (BPS), phenolphthalein (Ph), catechol (C), resorcinol (R), hydroquinone (Hq), ethylene glycol (EG), and 1,4-butanediol (Bu-1,4). Interfacial polycondensation of PNCCT with BPA was investigated in detail in order to select optimum reaction conditions. The yield of polyesters varies from 63 to 76%. The polyesters are soluble in methylated solvents such as dimethyl formamide, dimethyl sulfoxide, methanol etc. The reduced viscosity for polyesters, determined with a 1 g/dl solution in dimethyl formamide at 25±3°C was found to be in the range 0.340–0.628 dl/g. All the polyesters were characterised by IR spectra. The densities of the polyesters, determined using the suspension method at 25±3°C, range between 1.118 and 1.208 g cm−3. The overall reactivity of diols, based on reduced viscosity values, was found to decrease in the following order:PEBPA>PEPh>PEBPC>PER>PEHq>PEC>PEBPS>PEEG>PEBu-1,4The thermal stability of polyesters, based on various temperature characteristics, was found to decrease in the following order:PEPh>PER>PEHq>PEEG>PEBPS>PEBPA>PEBPC>PEC