Wednesday, August 21, 2019, 11:00 am — Bldg. 735, Conference Room A, 1st Floor
Charge-neutral diblock copolymers (CN-BCPs), BCPs containing a polymer electrolyte block, have received considerable attention due to their wide spread usage in energy storage and desalination applications. However, the impact of ionic interactions on their microphase phase segregation is still unknown and necessary for the rational design of CN-BCPs with optimal performance. In the first portion of the talk, I examine the impact of ionic interaction on bulk microphase segregation using trisaminocyclopropenium (TAC) containing CN-BCPs, a polyelectrolyte with strong ionic interactions that originate from an unexpectedly low dielectric constant (~3), in comparison with conventional CN-BCPs reported in the literature. Then, using a thin-film geometry in conjunction with in situ grazing incidence small angle x-ray scattering techniques, I will elucidate the impact of confinement and solvent interactions on domain orientation, periodicity, and registry in TAC-containing CN-BCPs. The unusual morphologies observed in TAC-containing CN-BCP in both bulk and thin-films, arising from strong electrostatic interactions, provide a foundation for the exploration of new modes of ion transport in condensed phases.
Hosted by: Kevin Yager
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