Multiresponsive Reversible Gels Based on Charge‐Driven Assembly

Abstract

Vernetzt: Ein ABA‐Triblock‐Copolymer mit geladenen Endgruppen und ein entgegengesetzt geladener Polyelektrolyt bilden Gele, die auf Änderungen in Konzentration, Temperatur, Ionenstärke, pH‐Wert und Ladungszusammensetzung reagieren. Oberhalb der kritischen Gelbildungskonzentration verbrücken die Triblock‐Copolymere Micellen zu einem probendurchspannenden transienten Netzwerk aus verknüpften Micellen.

Complex coacervate‐based materials for biomedicine

“…Modulation of the length of the neutral and polyelectrolyte blocks has also been reported to lead to coacervate‐core vesicles (Figure (d)). Extension of this strategy to a triblock copolymer system enables the formation of flower‐like micelles under dilute conditions or structured, hydrogel‐like coacervate‐based materials at higher concentrations, where the coacervate domains act as crosslinking points within the network (Figure (e) and (f)). More complex coacervate‐based geometries analogous to structures observed in traditional solvophobic block copolymers (i.e., bicontinuous and gyroid) should also be possible.…”

Activation Energies Control the Macroscopic Properties of Physically Cross‐Linked Materials

“…A supramolecular perspective has become increasingly important in the design of physically cross‐linked materials on account of the explosive growth in the development and understanding of strong and directional noncovalent binding motifs. Specific and well‐defined noncovalent interactions, such as hydrogen bonding, host–guest and metal–ligand interactions, can be designed in a rational manner,1–8 yet little is known about the role of fundamental supramolecular parameters in controlling the macroscopic properties of the resulting materials 9–11. The advantages of the self‐assembly approach to materials lie in the dynamic and stimuli‐responsive nature of the interactions that can effectively crosslink functional polymer chains in solution, leading to gel materials that are environmentally responsive in a way that permits tunable, reversible, and self‐healing materials 1–4.…”

Activation Energies Control the Macroscopic Properties of Physically Cross‐Linked Materials

“…The versatile CB[8] ternary complex has, therefore, proven to be a powerful asset for improving our understanding of challenging property-structure relationships in supramolecular systems and their associated influence on the bulk behavior of dynamically crosslinked materials.A supramolecular perspective has become increasingly important in the design of physically cross-linked materials on account of the explosive growth in the development and understanding of strong and directional noncovalent binding motifs. Specific and well-defined noncovalent interactions, such as hydrogen bonding, host-guest and metal-ligand interactions, can be designed in a rational manner, [1][2][3][4][5][6][7][8] yet little is known about the role of fundamental supramolecular parameters in controlling the macroscopic properties of the resulting materials. [9][10][11] The advantages of the self-assembly approach to materials lie in the dynamic and stimuliresponsive nature of the interactions that can effectively crosslink functional polymer chains in solution, leading to gel materials that are environmentally responsive in a way that permits tunable, reversible, and self-healing materials.…”