Phase Separated Methylated Polybenzimidazole (O‐PBI) Based Anion Exchange Membranes. Issue 5 (28th January 2015)

• Record Type: Journal Article
• Authors: Germer, Wiebke; Leppin, Janine; Nunes Kirchner, Carolina; Cho, Hyeongrae; Kim, Hyoung‐Juhn; Henkensmeier, Dirk; Lee, Kwan‐Young; Brela, Mateusz; Michalak, Artur; Dyck, Alexander
• Is Part Of: Macromolecular materials and engineering. Volume 300:Issue 5(2015:May)
• Page Start: 497
• Page End: 509
• Publication Date: 2015-01-28
• Subjects: Plastics -- Periodicals; Polymers -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1002/mame.201400345
• Languages: English
• ISSNs: 1438-7492

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="mame201400345-sec-0001" sec-type="section"> <p>Methylated polybenzimidazole (O‐PBI) based anion exchange membranes with a degree of methylation of ca. 78% were prepared in the iodide, chloride, carbonate, bicarbonate, and hydroxide form. Swelling in water showed a high anisotropy for chloride and carbonate exchanged membranes and a strong plasticizing effect of water was confirmed by DMA. Carbonate and bicarbonate exchanged membranes revealed an ionomer peak around 0.25 Å⁻¹ in SAXS measurements suggesting a phase separated morphology. Theoretical DFT calculations were used to characterize geometries and electronic structure of polymer models and interactions with different anions, and to rationalize the water uptake/swelling behavior.<inline-graphic xlink:href="ark:/27927/pgjkz4vkx4" content-type="mame201400345-gra-0001" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></p> </sec> </abstract>