Study on the curing kinetics of phthalonitrile promoted by bio-tyrosine cyclic peptide

The investigation on the curing kinetics of phthalonitrile is of significance for understanding the curing mechanism and optimizing the curing process. Here the curing kinetics of 1,3-bis (3,4-dicyanophenoxy) benzene (3BOCN) promoted by tyrosine cyclic peptide (TCP) was studied by non-isothermal differential scanning calorimetry (DSC) with the aid of two-dimensional correlation spectroscopy (2DCS). 2DCS revealed a multi-path curing reaction of 3BOCN/TCP system, so the peak fitting was used to calculate the kinetic parameters of the two curing pathways. The results showed that both curing pathways of 3BOCN/TCP system could be described by autocatalytic model, and the calculated values could fit well with the experimental data.