Physical-chemical properties of newly synthesized tetraalkylammonium alkyl ether carboxylate ionic liquids
作者:Thomas Myrdek、Crisan Popescu、Werner Kunz
DOI:10.1016/j.molliq.2020.114947
日期:2021.1
shorter carbon chains in the anions, bulkier cations or lower propoxyethylene degrees. The conductivity of the Ionic Liquids ranged from 1 to 3000 μS/cm and was dependent on the structure of the compound. Melting points of Ionic Liquids were dependent on the length of the carbon chain. At high temperatures, they decomposed in a two-step mechanism. First, the cationic part decomposed, and, at a higher temperature
合成了39种不同的离子液体,以对称的季铵阳离子和烷基醚羧酸盐为阴离子。与最近发表的由于乙氧基化引起的熔点降低的概念类似,此处的阴离子中的丙氧基乙烯基,PO基使各种盐在室温或接近室温下呈液态。测定了这种离子液体的物理化学性质,密度,粘度,电导率,热稳定性,熔融行为和吸湿性。密度与温度成线性关系,并且受离子液体分子量的影响。较长的碳链的较高粘度是由于较强的分子间范德华力所致。阴离子液体的碳链较短,阳离子体积较大或丙氧基乙烯度较低,从而降低了离子液体的粘度。离子液体的电导率范围为1至3000μS/ cm,并取决于化合物的结构。离子液体的熔点取决于碳链的长度。在高温下,它们以两步机理分解。首先,阳离子部分分解,并在较高温度下分解离子液体的阴离子部分。此外,离子液体表现出很强的吸湿性能,在长达5天的延长时间范围内都可以观察到。