Abstract
The intercalation compound of benzimidazole with α-zirconium phosphate (α-ZrP) was evaluated as a latent thermal initiator in the reaction of glycidyl phenyl ether (GPE) and hexahydro-4-methylphthalic anhydride (MHHPA). No reaction occurred at 60 °C after 1 h. Upon increasing the temperature to 140 °C, the conversion reached 97% after 1 h. The deintercalation ratio of Bim from the intercalation compound of benzimidazole with α-zirconium phosphate (α-ZrP·Bim) was measured in the reaction of the GPE-MHHPA system. The deintercalation ratio increased upon increasing the temperature, reaching 97% at 120 °C after 1 h. The storage stability at 25 °C and 40 °C in the reaction of GPE-MHHPA was tested and was found to be maintained for 14 days at 25 °C. The intercalation compound of α-ZrP·Bim can effectively serve as a latent thermal initiator in the reaction of GPE-MHHPA.
Highlights
There is considerable interest in the development of latent polymerization initiators that are inert in monomers or prepolymers under storage conditions
We have previously reported that primary alkylamines intercalated with α-zirconium phosphate (α-ZrP) can serve as latent thermal initiators in the reaction of glycidyl phenyl ether (GPE) [11,12] and that intercalation compounds of 1,4-diazabicyclo[2,2,2]octane (DABCO), 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU), imidazole (Im), 2-methylimidazole (2MIm), and
The intercalation compound was recovered by suction filtration
Summary
There is considerable interest in the development of latent polymerization initiators that are inert in monomers or prepolymers under storage conditions. We have previously reported that primary alkylamines intercalated with α-zirconium phosphate (α-ZrP) can serve as latent thermal initiators in the reaction of glycidyl phenyl ether (GPE) [11,12] and that intercalation compounds of 1,4-diazabicyclo[2,2,2]octane (DABCO), 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU), imidazole (Im), 2-methylimidazole (2MIm), and. 2-ethyl-4-methylimidazole (2E4MIm) with α-ZrP (α-ZrP·DABCO, α-ZrP·DBU, α-ZrP·Im, α-ZrP·2MIm, and α-ZrP·2E4MIm, respectively) show good performance as latent thermal initiators in the reaction of GPE with hexahydro-4-methylphthalic anhydride (MHHPA) [13,14,15]. The equivalents of imidazoles in intercalation compounds of α-ZrP are 0.78 (Im), 0.96 (2MIm), and 0.65 (2E4MIm). After reaction with the GPE-MHHPA system, 35% (α-ZrP·Im), 48% (α-ZrP·2MIm), and 37% (α-ZrP·2E4MIm) of the intercalated imidazoles were deintercalated from the layers of zirconium phosphate [14]. Less than half of the imidazole was available for the reaction of GPE-MHHPA
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