Orduna Lidia, Otaegi Itziar, Aranburu Nora, Guerrica-Echevarría Gonzalo
POLYMAT and Department of Advanced Polymers and Materials: Physics, Chemistry and Technology, Faculty of Chemistry, University of the Basque Country (UPV/EHU), Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain.
Nanomaterials (Basel). 2023 Feb 14;13(4):725. doi: 10.3390/nano13040725.
Good dispersion of carbon nanotubes (CNTs) together with effective curing were obtained in epoxy/CNT nanocomposites (NCs) using three different ionic liquids (ILs). Compared to conventional amine-cured epoxy systems, lower electrical percolation thresholds were obtained in some of the IL-based epoxy systems. For example, the percolation threshold of the trihexyltetradecylphosphonium dicyanamide (IL-P-DCA)-based system was 0.001 wt.%. The addition of CNTs was not found to have any significant effect on the thermal or low-strain mechanical properties of the nanocomposites, but it did improve their adhesive properties considerably compared to the unfilled systems. This study demonstrates that ILs can be used to successfully replace traditional amine-based curing agents for the production of electrically conductive epoxy/CNT NCs and adhesives, as a similar or better balance of properties was achieved. This represents a step towards greater sustainability given that the vapor pressure of ILs is low, and the amount needed to effectively cure epoxy resins is significantly lower than any of their counterparts.
使用三种不同的离子液体（ILs），在环氧/碳纳米管纳米复合材料（NCs）中实现了碳纳米管（CNTs）的良好分散以及有效的固化。与传统胺固化环氧体系相比，一些基于离子液体的环氧体系获得了更低的电渗滤阈值。例如，基于双氰胺三己基十四烷基鏻（IL-P-DCA）体系的渗滤阈值为0.001 wt.%。未发现添加碳纳米管对纳米复合材料的热性能或低应变力学性能有任何显著影响，但与未填充体系相比，它确实显著改善了其粘合性能。这项研究表明，离子液体可成功替代传统的胺基固化剂，用于生产导电环氧/碳纳米管纳米复合材料和粘合剂，因为实现了相似或更好的性能平衡。鉴于离子液体的蒸气压低，且有效固化环氧树脂所需的量明显低于其任何同类产品，这代表了朝着更大可持续性迈出的一步。
