Structural and Gelation Characteristics of Metallo-Supramolecular Polymer Model-Network Hydrogels Probed by Static and Dynamic Light Scattering

Supramolecular polymer gels are a promising class of materials whose polymer components are connected by transient bonds such as metal-ligand interactions, thereby spanning a dynamic network throughout the entire sample volume. Due to the short bond lifetimes in these networks, structural characterization on appropriate time and length scales is a challenge. To address this challenge, we vary the association strengths of telechelic poly(ethylene glycol) model networks through the use of different bivalent metal ions with the aim of conducting a systematic investigation of their scattering properties. Introduction of a preparation method that opens the opportunity to tune the gelation time allows the underlying gelation mechanism to be revealed by time-resolved light scattering. A statistical analysis of the gel scattering intensities shows major differences depending on the metal-terpyridine association strength.

Automated summary

This study investigates the scattering properties of supramolecular polymer gels and explores the effects of different metal ions on telechelic poly(ethylene glycol) model networks. By introducing a new preparation method that alters the gelation time, the underlying gelation mechanism can be revealed through time-resolved light scattering. Statistical analysis of gel scattering intensities reveals major differences based on the metal-ligand association strength.