4.7 Article

Bicontinuous Ion-Exchange Materials through Polymerization-Induced Microphase Separation

Journal

ACS MACRO LETTERS
Volume 10, Issue 1, Pages 60-64

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.0c00684

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Funding

  1. National Science Foundation [DMR-2003454]

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The article discusses the use of polymerization-induced microphase separation to prepare solid cross-linked monoliths containing bicontinuous and nanostructured polymer domains, with either a negatively or positively charged polyelectrolyte domain. The study confirmed the continuity of the charged domains through dye exchange experiments and estimated the number of accessible charges within the material.
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.

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