A variety of organic liquids can be immobilised using certain 4-tert-butyl-1-arylcyclohexanol derivatives (BACOl). Only the isomers with axial aryl groups are active as gelling agents. The BACOl–hydrocarbon systems have been characterised with respect to their rheological properties under shear. The gels are viscoelastic solids with high elastic shear moduli (G′≈70350 Pa at C≈2.2 wt.% in dodecane) and high yield stresses (σ≈620 Pa). A 3D network with high cohesive energy and long lifetimes of the related structures is in thermal equilibrium with the surrounding solution. Diffraction experiments have characterised the crystallinity of the gel networks made up of assemblies of bimolecular BACOl associations (d≈14.3 Å). Xerogels exhibit a mesomorphic organisation with a 76 Å repeating unit. Phase diagrams have been determined as a function of the solvent and gelator types and the related thermodynamic parameters were deduced. IR spectroscopy has demonstrated that H-bonding is responsible for the aggregation of the BACOl molecules.
某些 4-叔丁基-1-芳基
环己醇衍
生物(
BACOl)可固定多种有机液体。只有带有轴向芳基的异构体才具有胶凝剂的活性。
BACOl 碳氢化合物体系在剪切力作用下的流变特性已得到表征。凝胶是粘弹性固体,具有高弹性剪切模量(在
十二烷中的 C≈2.2 wt.% 时,G′≈70350 Pa)和高屈服应力(σ≈620 Pa)。与周围溶液处于热平衡状态的三维网络具有较高的内聚能和较长的相关结构寿命。衍射实验确定了由双分子
BACOl 结合体(d≈14.3 Å)组成的凝胶网络的结晶特性。Xerogels 显示出一种具有 76 Å 重复单元的介形态组织。根据溶剂和凝胶剂类型确定了相图,并推导出了相关的热力学参数。红外光谱显示,H 键是
BACOl 分子聚集的原因。