Complex Coacervate Core Hydrogels: Effect of Charge Block Length Asymmetry and Polymer Architectures
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Complex Coacervate Core Hydrogels (C3Hs) are formed by mixing ABA triblock copolymers and oppositely charged counterparts. In this study, we investigate the effect of charge block length asymmetry and polymer architecture on the structure and relaxation dynamics of C3Hs using dynamic mechanical analysis and small-angle X-ray scattering. C3Hs were prepared by mixing of ABA triblock copolymer and oppositely charged A'B diblock copolymer in an aqueous solvent. Although the chain length recognition has been well known for the micro-phase separation driven by complex coacervates, we successfully formed C3Hs at 1:1 charge stoichiometric ratio condition. The core radii and relaxation behavior of C3Hs are significantly controlled by both A and A’ charged block lengths. Furthermore, A’ homopolymer is employed instead of A’B diblock copolymer as a counterpart, which allows us to investigate the effect of polymer architecture on the structure and dynamic behaviors.