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Explore the complex dynamics of biopolymer coacervates in this research lecture examining how molecular asymmetry affects the mechanical properties and adhesion of charged polymer networks. Investigate the systematic study of hyaluronic acid (HA) and chitosan (CHI) coacervate systems, focusing on how variations in molecular weight and chain flexibility influence network formation under different salt conditions. Learn about the construction of nine distinct HA-CHI coacervate systems with both symmetric and asymmetric molecular weight combinations, and discover how small-amplitude oscillatory shear rheology, van Gurp-Palmen plots, and probe tack adhesion testing reveal the relationship between polymer structure and mechanical performance. Understand the critical distinction between unentangled and entangled coacervate systems, where unentangled low-molecular-weight pairs exhibit rapid terminal relaxation and follow time-salt superposition principles, while entangled systems display non-universal scaling due to salt-insensitive mechanisms including chain retraction and topological constraints. Examine how molecular asymmetry creates strategic opportunities for material design, as flexible high-molecular-weight chitosan with shorter HA chains provides strong adhesion and dynamic responsiveness at low salt concentrations, while rigid high-molecular-weight HA maintains mechanical resilience under salt stress conditions. Gain insights into the structure-dynamics-adhesion relationships in charged polymer networks and discover how asymmetric combinations of chain length and flexibility can be strategically employed to balance salt responsiveness with mechanical performance for applications in bioinspired adhesives, drug delivery systems, and soft tissue engineering.
