Curing kinetics of chemically recyclable thermoset and their nanocomposites

• Published in: Thermochimica acta Vol. 679; p. 178317
• Main Authors: Bello, Roger H., Coelho, Luiz A.F.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2019
• Subjects: Chemically recyclable thermoset; Curing kinetics; Nanocomposites; Polyhexahydro-s-triazine (PHT); Nanocomposites; Curing kinetics; Chemically recyclable thermoset; Polyhexahydro-s-triazine (PHT)
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/j.tca.2019.178317

[Display omitted] •Curing kinetics of polyhexahydro-s-triazine (PHT) polymer was investigated for the first time.•The activation energy value calculated for neat PHT polymer from non isothermal runs was 143 kJ/mol.•BaTiO3 or MWCNT nanoparticles catalyzed the curing reaction of PHT nanocomposites.•Avrami-Erofeev (A2 and A3) were the most suitable reaction models of curing kinetics of PHT polymer and its nanocomposites. In this work the role of the addition of barium titanate (BaTiO3) or multi-walled carbon nanotubes (MWCNT) on curing kinetics of the polyhexahydro-s-triazine (PHT) was investigated. The estimation of kinetic parameters triplet (activation energy, pre-exponential factor, and the reaction model) of PHT and its nanocomposites were made by isoconversional models. It is possible to state the conversion of the polyhemiaminal (PHA) into PHT polymer and all nanocomposites studied in this work is dominated by a single step according to the Vyazovkin method. The activation energy calculated by studying the cure kinetics for the chemical rearrangement of PHT polymer was 143 kJ/mol. Besides, the addition of BaTiO3 nanoparticles greater than 1.5 wt% and 0.86 wt% of MWCNT showed a catalytic effect on the cure reaction with respect to the neat polymer. Finally, the Avrami-Erofeev’s model proved to be the most suitable that represents the cure kinetics of PHT polymer and their nanocomposites.