Freitas, Gabriel published the artcileImpact of magnetic ionic liquids as catalysts on the curing process of epoxy/anhydride system: Mechanistic investigation and dynamic-mechanical analysis, Quality Control of 79917-90-1, the publication is Journal of Applied Polymer Science (2022), 139(28), e52606, database is CAplus.
Cyclic acid anhydride – based hardeners provide excellent physic-mech. and thermal properties to epoxy networks. However, the curing process takes place at relatively high temperature, thus limiting the applications as coatings and free-heating devices. The present work describes for the first time the efficient catalytic action of imidazolium- and phosphonium- based ionic liquids (IL) bearing iron tetrachloride (FeCl4) as counter anion for the curing process of epoxy prepolymer (EP)/methyl tetrahydrophthalic anhydride (MTHPA) even at room temperature Indeed, both differential scanning calorimetry and rheol. anal. revealed that the addition of 5 phr of trihexyl (tetradecyl)-phosphonium iron tetrachloride (P66614. FeCl4) resulted in faster curing process when compared with systems cured with conventional tertiary amine. The gelation at room temperature occurred before 24 h with this magnetic IL. Moreover, the systems catalyzed by P66614. FeCl4 presented higher glass transition temperature, higher storage modulus and higher crosslink d. as indicated by dynamic-mech. anal. (DMA). A mechanism for the curing process was proposed based on DSC and Fourier transform IR anal. These results highlight the importance of magnetic ILs as catalysts for the curing process of EP/MTHPA system and open new avenues for applications of this system as a room temperature-based curing system.
Journal of Applied Polymer Science published new progress about 79917-90-1. 79917-90-1 belongs to imidazoles-derivatives, auxiliary class Ionic Liquid,Ionic Liquid, name is 3-Butyl-1-methyl-1H-imidazol-3-ium chloride, and the molecular formula is C8H15ClN2, Quality Control of 79917-90-1.
Referemce:
https://en.wikipedia.org/wiki/Imidazole,
Imidazole | C3H4N2 – PubChem