Research
on ionic liquids is constantly providing information on
their new and more advanced applications. Undoubtedly, the use of
latent curing agents for epoxy resins is one of the most interesting
applications of this group of compounds. In this work, a detailed
description of the synthesis and physicochemical studies of DABCO-based
(1,4-diazabicylo[2.2.2]octane) ionic liquids is presented. Their most
valuable feature is that they can be latent curing agents for polymerization
of epoxy resins, which in turn can be used, when combined with fibers,
as composites with special, new properties. The research includes
detailed discussion of synthesis of new DABCO-ILs, focusing on obtaining
pure compounds and expanding current knowledge on the subject. Thermal
(DSC) and chromatographic (IC) properties have been discussed for
all presented salts. Furthermore, ionic liquids with dicyanamide and
triflate anion have demonstrated the ability to initiate polymerization
of epoxy resins. Subsequently, all mixtures were cured into cubical
shape and were subjected to the Shore hardness test (SHT). The main
advantages of the obtained ILs are (i) the ability to store ionic
liquids/epoxy resin mixture for prolonged periods of time without
deterioration of curing properties and (ii) a significantly lower
quantity of ionic liquids used in the process of curing epoxy resins.
A new synthetic approach and full spectral (NMR, IR, MS) and ion chromatographic characterization (IC) of nitrogen‐based ionic liquids bearing allyl‐ or ethyl‐ substituent and triflate, tosylate, methyl sulfate or methanesulfonate anion has been presented. On a sample of 16 new ionic liquids, the versatility of the anion exchange method has been proven. In the metathesis reactions that have been carried out, the halide anion was exchanged in ionic liquid with an alkyl sulfonate based anion using alkylating agents. The results obtained using ion chromatographic analysis on the newly synthesized compounds have been discussed. Also, the utilization of a gaseous methyl halide by‐product, obtained in the metathesis reaction and otherwise difficult to synthesize, has been presented. This approach ensured high atom economy of the overall process, which makes the proposed methodology sustainable and eco‐friendly.
The synthesis and characterization of a series of allyl-functionalized ionic liquids and examples of their application in catalysts and surface-functionalizing compound formation.
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