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- Title
Synthesis of a Bis‐Urea Dimer and Its Effects on the Physical Properties of an Amphiphilic Tris‐Urea Supramolecular Hydrogel.
- Authors
Sawada, Hiroki; Yamanaka, Masamichi
- Abstract
Abstract: The successful development of stiff supramolecular gels is an important goal toward their practical application. One approach to stiffen supramolecular gels is to introduce covalent cross‐links. The bis‐urea dimer <bold>2</bold>, having a structure similar to that of the low‐molecular‐weight gelator <bold>1</bold>, was synthesized. Supramolecular hydrogels were formed from mixtures of <bold>1</bold> and <bold>2</bold> in appropriate ratios, with <bold>2</bold> acting as a covalent cross‐linker to connect the fibrous aggregates formed by the self‐assembly of <bold>1</bold>. The introduction of these covalent cross‐links greatly influenced the dynamic viscoelasticity of the supramolecular hydrogels. In the supramolecular hydrogel of <bold>1</bold> mixed with 5 % <bold>2</bold>, the storage modulus was 1.35 times higher than that of the supramolecular hydrogel of <bold>1</bold> alone, and the crossover strain was extended from 5 % to over 20 %. The supramolecular hydrogel of <bold>1</bold> and <bold>2</bold> was free‐standing and supported 13 times its own weight.
- Subjects
UREA derivatives; DIMERIZATION; HYDROGELS; SUPRAMOLECULAR polymers synthesis; CROSSLINKING (Polymerization); ANALYTICAL chemistry
- Publication
Chemistry - An Asian Journal, 2018, Vol 13, Issue 8, p929
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201800217