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The key effect of the self-assembly mechanism of dendritic gelators: solubility parameters, generations and terminal effects

机译：树突状胶凝剂自组装机制的关键作用：溶解度参数，生成和最终效应

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The key effect of the self-assembly mechanism of dendritic gelators is researched by a comprehensive investigation of the gelation behavior of L-lysine dendritic gelators with different structures of three generations in 20 different solvents. The solvents investigation, H-1 NMR, tube inversion method, DSC, rheology, FTIR and rheological measurements show that the reported dendritic gelators self-assemble through the main driving force of hydrogen bonds and the second driving force of pi-pi stackings. So the key effect of the self-assembling mechanism is that these factors can influence the driving force of the self-assembly process. This is the reason that L-lysine dendritic gelators tend to gelate in solvents with low a and beta parameter values, which have less influence on the formation of hydrogen bonds between the gelators. Higher generations provide a much greater hydrogen bond density in the gelators, which makes them have a higher gelation ability. The benzyl terminal groups provide the second driving force of pi-pi stacking, making the Bzl-Gly-Lys gelators have much stronger gelation ability. This research reports a comprehensive insight into the precise ways in which the solubility parameters of the solvents, the gelator generation and the terminal group effects can influence the self-assembly and gelation of dendritic gelators. Gaining this type of fundamental understanding is essential if the key effect of this important class of self-assembling soft materials is to be truly understood.
机译：通过全面研究三代结构不同的L-赖氨酸树突状胶凝剂在20种不同溶剂中的凝胶化行为，研究了树突状胶凝剂自组装机理的关键作用。溶剂研究，H-1 NMR，管反演方法，DSC，流变学，FTIR和流变学测量结果表明，所报道的树枝状胶凝剂通过氢键的主要驱动力和pi-pi堆积的第二驱动力进行自组装。因此，自组装机制的关键作用是这些因素会影响自组装过程的驱动力。这是L-赖氨酸树状胶凝剂倾向于在α和β参数值较低的溶剂中胶凝的原因，这对胶凝剂之间氢键的形成影响较小。高世代在胶凝剂中提供更大的氢键密度，这使它们具有更高的胶凝能力。苄基端基提供了pi-pi堆积的第二驱动力，使得Bzl-Gly-Lys胶凝剂具有更强的胶凝能力。这项研究报告了对溶剂溶解度参数，胶凝剂生成和端基效应可影响树突胶凝剂自组装和胶凝的精确方法的全面见解。如果要真正理解这类重要的自组装软材料的关键作用，则必须具有这种基本理解。

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