Structure of the Crystalline Core of Fiber-like Polythiophene
Block Copolymer Micelles
Posted on 2018-04-10 - 19:03
The internal structure
and cross-sectional geometry of fiber-like
poly(3-hexylthiophene)-based block copolymer micelles has been determined
using small- and wide-angle X-ray scattering (SAXS and WAXS, respectively)
techniques alongside electron and atomic force microscopies. WAXS
of concentrated micellar solutions demonstrated that the block copolymers
form crystalline-core micelles in solvents selective for the corona-forming
block. Furthermore, by generating macroscopic fibers from micellar
solutions, it was possible to align the micelles and discern the type
and orientation of the unit cell within the core. Using the unit cell
information gained from the wide-angle measurements, in conjunction
with the structural insights gained from the microscopy techniques,
it was possible to form a complete picture of the cross-sectional
geometry of the micelles, whereby the polymer chains lie perpendicular
to the long axis of the micelle core and do not undergo chain folding.
Finally, this information was used to propose a self-assembly mechanism
and to construct and validate a model for the small-angle scattering
data, revealing the inherent flexibility of the micelles.
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Hayward, Dominic
W.; Lunn, David J.; Seddon, Annela; Finnegan, John R.; E. C. Gould, Oliver; Magdysyuk, Oxana; et al. (2018). Structure of the Crystalline Core of Fiber-like Polythiophene
Block Copolymer Micelles. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b02552