Kinetics and modelling of thermal polycyclotrimerization of aromatic dicyanates

Abstract

The kinetics of polycyclotrimerization of 2,2‐bis(4‐cyanatophenyl)propane was analyzed by differential scanning calorimetry and IR spectroscopy. The autocatalytic character of the reaction was elucidated by modelling the conversion‐time curves of systems with definite admixtures of the found intermediate products. Furthermore, quantitative relations between the purity of the dicyanate, the rate of the brutto reaction, the temperature of the DSC maximum, and the B‐time of the resin were found.

Characterization and modeling of rigid branched polycyanates

“…However, on the basis of solubility tests, the polymer was found to gel soon after 60% conversion. Thus, these results agree with those of Shimp et al14 and others17-21 and are in conflict with those of Bauer et al 15,16 (see Table I). The typical accuracy of 13C NMR is 10%.…”

Mixtures of Liquid-Crystalline and Amorphous Dicyanates: Unusual Curing Behavior and Mechanical Properties

“…This effect may provide an additional contribution to transmittance of IR through the sample. We were unable to observe a sudden increase in the baseline of the absorbance as observed in a similar system by Mormann et al In addition, it is known that significant change in the refractive index increment from the monomer to the thermoset was found to make a precise determination of the monomer/thermoset ratio from FT/IR data difficult . The curing reaction was assumed complete when the absorption intensity at 2268 cm -1 disappeared.…”

Kinetic Study of Curing Bisphenol A Dicyanate Ester with Ionic Liquid Additive

“…The higher activation energies E 1 and E 2 also result in acceleration of the 8 wt % BADCy/aromatic IL reaction and higher d x /d T in dynamic runs, such that the BADCy reaction is completed within a shorter time. As a caveat, the authors acknowledge that although the reaction model well describes the cure of dicyanate ester in this work and in the literature, validation of the physical significance of model parameters would require further work.…”