Synthesis,structural characterization,and thermal degradation kinetics of s -triazine-based homopolyesters

Abstract

A series of s-triazine-based homopolyesters was synthesized via polycondensation of a 4,6-bis-(N-(4-(benzoylchloride)amino))-2-(N-benzyl-piperazin-1-yl)-1,3,5-triazine (monomer) with various aliphatic and aromatic diols. The structures were confirmed using FT-IR and ¹H NMR spectroscopy. Physicochemical characterization revealed that polyesters containing aromatic moieties exhibited higher density, intrinsic viscosity, and improved thermal stability compared to those derived from aliphatic diols. Solubility studies indicated enhanced dissolution behaviour in polar aprotic solvents at elevated temperatures. Thermogravimetric analysis demonstrated significant thermal resistance, particularly for bisphenol-based systems. The thermal degradation kinetics were evaluated using Coats–Redfern, Horowitz–Metzger, Broido, and Chan methods, showing consistent trends with variations attributed to model assumptions. The overall degradation trends remained consistent. The combined physicochemical and thermal characteristics suggest that these s-triazine-based homopolyesters may be promising candidates for advanced materials requiring thermal resistance and structural stability.

Graphical Abstract

Keywords

polycondensation thermal degradation kinetics activation energy high-performance polymers

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