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<p>This study establishes systematic design guidelines for organogels by exploring stepwise side-chain substitution and core skeleton geometry. While our previous work focused on functional comparisons between hetero-type molecules and physical mixtures, this study investigates how incremental replacement of oleyl chains with 2-ethylhexyl (2C<sub>8</sub>) chains dictates the balance between solubility and self-assembly. We demonstrate that the core skeleton (pyromellitamide (PMDA-R), its hydrogenated analogue (HPMDA-R), or butane tetracarboxamide (BT-R)) is the primary determinant of the rheological fingerprint. Quantitative scaling analysis reveals that although different skeletons produce comparable network mesh sizes, intrinsic fiber rigidity governs macroscopic gel strength. These findings provide a robust strategy for predictable engineering of supramolecular architectures, shifting the focus from simple functional proof to comprehensive structural design for advanced material control.</p>

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Effects of side-chain mixing ratio and core structure on the rheological properties of PMDA-based organogelators in isododecane

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Aya Kaide,
  • Takashi Saeki

摘要

This study establishes systematic design guidelines for organogels by exploring stepwise side-chain substitution and core skeleton geometry. While our previous work focused on functional comparisons between hetero-type molecules and physical mixtures, this study investigates how incremental replacement of oleyl chains with 2-ethylhexyl (2C8) chains dictates the balance between solubility and self-assembly. We demonstrate that the core skeleton (pyromellitamide (PMDA-R), its hydrogenated analogue (HPMDA-R), or butane tetracarboxamide (BT-R)) is the primary determinant of the rheological fingerprint. Quantitative scaling analysis reveals that although different skeletons produce comparable network mesh sizes, intrinsic fiber rigidity governs macroscopic gel strength. These findings provide a robust strategy for predictable engineering of supramolecular architectures, shifting the focus from simple functional proof to comprehensive structural design for advanced material control.