Synthesis, characterization and comparative thermal degradation kinetics of s-Triazine based polymers

• Published in: Journal of polymer research 2021-08, Vol.28 (8), Article 304
• Main Authors: Osman, Sameh M., Alasmary, Fatmah A., Kenawy, El‐Refaie, Aly, El-Saied A., Khattab, Sherine N., El-Faham, Ayman
• Format: Article
• Language: English
• Subjects: Aniline; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Copolymers; Diamines; Industrial Chemistry/Chemical Engineering; Molecular structure; Original Paper; Parameters; Polymer Sciences; Stability analysis; Thermal degradation; Thermal stability; Thermodynamic properties; Thermogravimetric analysis
• ISSN: 1022-9760; 1572-8935
• DOI: 10.1007/s10965-021-02667-y

A series of copolymers based on s-triazine and ethylene diamine moiety were synthesized; the prepared copolymers were characterized by FT-IR, TGA, DSC, and GPC. The thermogravimetric analysis of and the thermal stability of the copolymers were used to investigate their non-isothermal behavior. The comparative kinetic study was done using Kissinger method as a model-free; in addition, iso-conversional methods of Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO) and Friedman (FR) are reported. The activation energy data extracted by the KAS, FWO and FR fit well with each other (as they are showing the same trend). Generally, the activation parameters were highly dependent on the copolymer's molecular structure. In addition, the substituent on the triazine core has a great impact, where the activation parameters increased in the presence of an electron-donating group such as a methoxy group (OCH 3 ) on the aniline moiety. In contrast, it has decreased in the presence of the unsubstituted and p -bromo derivative (week deactivating group). On the other hand, the methoxy group attached to the aniline moiety gave the highest ash formation and the highest limiting oxygen index (LOI) value (29.45).