Synthesis, characterization, thermal stability and kinetics of thermal degradation of novel polymers based-s-triazine Schiff base

The present work represents the synthesis of five new s-triazine based Schiff base polymers via condensation polymerization process between bishydrazino-s-triazine derivatives and terephtaldehyde. The prepared polymers were characterized by different techniques (FTIR, UV-Vis, TGA, XRD and DSC). The new polymers showed good thermal properties and good values for the Limited Oxygen Indexed (LOI) 22.74, 27.36, 30.52, 24.38, 21.39 for polymers 5a-e; TP-DHBT, TP-DHMBT, TP-DHMT, TP-DHPT, and TP-DHMeT, respectively. Accordingly, these types of polymers could be classified as flame-retardant and self-extinguishing polymers. The T-g values of the polymers 5a-e varied in the range from 191.4 to 241.1. The effect of substituent in the triazine ring has great impact on the properties of the polymers 5a-e as observed from the DSC and XRD results. Moreover, the thermal degradation kinetics of two selected polymers with higher thermal stability (5b and 5c) from the prepared series was studied using the method of Friedman. The behavior of activation energy is found to be highly dependent on the polymer molecular structure.