Novel HEMA-Based Deep Eutectic Solvents: Synthesis, Physical Properties, and Their Application as Lipogels

In this study, novel HEMA-based deep eutectic solvents (DESs) were prepared by mixing different molar ratios of 2-hydroxyethyl methacrylate (HEMA) as a hydrogen bond acceptor and maleic acid as a hydrogen bond donor. The prepared novel deep eutectic solvents were investigated by measuring the HEMA-based DESs’ physical properties, such as thermal properties, density, sound velocity, conductivity, surface tension, and refractive index, at different temperatures. The physical properties of novel HEMA-based DESs were decreased with increasing temperature and molar ratio due to increasing voids within deep eutectic mixtures. Furthermore, the novel HEMA-based DESs were applied for the first time to the preparation of lipogel. The softness of the prepared lipogel was reduced upon increasing the molar ratio of the hydrogen bond acceptor in the deep eutectic liquid mixtures.