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Polymerization-induced microphase separation has been used to prepare solid cross-linked monoliths containing bicontinuous and nanostructured polymer domains. We use this process to fabricate a monolith containing either a negatively or positively charged polyelectrolyte domain inside of the neutral styrene/divinylbenzene-derived matrix. First, the materials are made with a neutral pre-ionic polymer containing masked charged groups. The monoliths are then functionalized to a charged state by treatment with trimethylamine; small-angle X-ray scattering shows no significant morphological change in the microphase-separated structure upon postpolymerization modification. By exchanging dyes with the counterions in the material, we corroborated the continuity of the charged domains. Using ion-exchange capacity measurements, we estimate the number of accessible charges within the material based on macro-chain transfer agent molar mass and loading.
Bibliographical noteFunding Information:
The authors acknowledge the National Science Foundation for financial support of this work (DMR-2003454).
Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial funding support from the National Science Foundation (NSF) through the MRSEC program.
How much support was provided by MRSEC?
Reporting period for MRSEC
- Period 7