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The polycyclotrimerization reaction of dicyanate ester of bisphenol E (DCBE) in the presence of varying amounts (from 0.5 to 5 wt%) of 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIm][BF 4 ]) ionic liquid has been investigated using differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) techniques, after a curing stage at 150 °C for 6 h.It is noteworthy that an amount of [OMIm][BF 4 ] as low as 0.5 wt% accelerates dramatically the thermal curing process leading to the formation of a polycyanurate network.The conversion of DCBE increased with increasing [OMIm][BF 4 ] content in the temperature range studied.A reaction mechanism associated with the ionic liquid-catalyzed DCBE polycyclotrimerization is newly proposed via the involvement of a [CN] δ+ -[OMIm] δ-complex as a key intermediate.
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Fainleib et al. (2016) studied this question.
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