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Investigation of the effect of metal-containing ionic liquids on curing of epoxy/anhydride systems by Near-IR spectroscopy
Authors: Honzíček Jan
Year: 2023
Type of publication: ostatní - přednáška nebo poster
Page from-to: nestránkováno
Titles:
Language Name Abstract Keywords
eng Investigation of the effect of metal-containing ionic liquids on curing of epoxy/anhydride systems by Near-IR spectroscopy Cyclic anhydrides of dicarboxylic acids are commonly used curing agents for epoxy resins for many years [1]. Over more pronounced amine hardeners, they give several advantaged such as longer pot life and much low exothermic heats of the reaction. Due to lower heat generation and little shrinkage, the epoxy/anhydride systems are suitable for production of larger and thicker objects. Cured material usually exhibits better thermal, mechanical, and electrical properties than similar epoxy/amine systems. The curing of epoxy/anhydride systems proceeds at elevated temperature. Catalysis by tertiary amines enables to lower curing temperature bellow 200°C [2]. Recently, metal-containing imidazolium-based ionic liquids (ILs) have been suggested as promising catalysts for epoxy/anhydride systems exhibiting high activity due to cooperative activity of imidazolium ring and metal complex anion [3]. This study is focused on description of chemical processes proceeding in epoxy/anhydride system. The curing process was followed by Near-IR spectroscopy at elevated temperature. Figure 1 shows developments of the spectra in time together with assignment of characteristic bands. The effect of ILs containing Zn, Co and Fe was investigated on commercially used mixtures of epoxy resin with anhydride hardener. Obtained results are compared formulation treated with base catalyst (1-methylimidazole) and with common IL without metal. Catalytic activity at low temperature was observed for iron-containing IL. Effect of metal concentration on the low temperature process is currently ongoing.

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