Structure and Relaxation Dynamics for Complex Coacervate Hydrogel of ABA Triblock Copolymer
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Complex coacervation is a liquid-liquid phase separation when two oppositely charged polyelectrolytes are met in an aqueous solution. Since the complex coacervate are responsive to salt concentration and pH, it has been employed to bio-related industry. Hydrogels with coacervate domain can be prepared by simple mixing method of ABA and A’BA’ triblock copolymer, where A and A’ are oppositely charged blocks. Because of specific junction, the coacervate hydrogels have advantages involving self-healing and stimuli-responsiveness. In this study, the structure and rheological properties of the coacervate hydrogels were investigated by small-angle X-ray/Neutron scattering (SAX/NS) and rheometer. The relation between relaxation time and charged block length was observed by time-salt superposition principles. We found that the relaxation time has strong dependency with charged block length. Furthermore, the potentiality of 3D printing material was verified based on the short relaxation time.