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Equilibrium Self-Assembly, Structure, and Dynamics of Clusters of Star-Like Micelles

Published

Author(s)

Vivek M. Prabhu, Shrinivas Venkataraman, Yi Yan Yang, James Hedrick

Abstract

Small-angle neutron scattering and static and dynamic light scattering have characterized the hierar-chical structure and dynamics of clusters of self-assembled star-like micelles formed by oligocarbonate-fluorene func-tionalized polyethylene glycol triblock copolymers below the gelation point. The micelles persist in equilibrium with concentration-dependent sized clusters. When probed at length scales within the clusters by dynamic light scattering, the finite-sized clusters exhibit Zimm dynamics, reminiscent of dilute mesoscale chains of micelles, similar to worm-like micelles formed by surfactants. We attribute the ability to form chain-like clusters due the specific pi-pi stacking of the oligocarbonate-fluorene groups displayed by the star-like micelles. The deviations in the local solvent (D2O) viscosity, calculated by the Stokes-bead monomeric friction coefficient, are consistent with an established literature for polymers in organic solvents.
Citation
ACS Macro Letters

Keywords

triblock copolymer, star-like micelle, cluster, neutron scattering, light scattering

Citation

Prabhu, V. , Venkataraman, S. , , Y. and Hedrick, J. (2015), Equilibrium Self-Assembly, Structure, and Dynamics of Clusters of Star-Like Micelles, ACS Macro Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918800 (Accessed April 14, 2024)
Created October 17, 2015, Updated August 1, 2019