Length effect on Molecular Exchange Kinetics in Complex Coacervate Core Micelles
발표자
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초록
내용
Complex coacervate core micelles (C3Ms) are formed by mixing of AB and A’B diblock copolyelectrolyte in an aqueous solution, where A and A’ are oppositely charged blocks, and B is PEO block. C3Ms has been investigated in applications such as reactor and vehicles due to charged nature of the core. However, much less is known about the kinetics of C3Ms. It is essential for stability and reproducibility. In this study, we investigated the chain dynamics of C3Ms with different core block length using time-resolved small-angle neutron scattering (TR-SANS). C3Ms were formed by a pair of functionalized poly(ethylene oxide-b-allyl glycidyl ether), including ammonium, and sulfonate. Electrostatic interaction is controlled by salt, and the observed rates at multiple salt concentrations are consolidated using time-salt superposition. Proposed relaxation function based on the sticky-Rouse model and the energetic barrier for chain pulling describes the molecular exchange kinetics between C3Ms.