427238 Polymer Threaded MOF As an Effective Ion Exchange Material

Tuesday, November 10, 2015: 10:06 AM
255E (Salt Palace Convention Center)
Kwong-Yu Chan1, Chi-Ying Vanessa Li1 and Liang Gao2, (1)Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, (2)Chemistry, The University of Hong Kong, Hong Kong, Hong Kong

We extend the concept of “in situ polymerization in MOF” from Kitigawa and co-workers [1], to synthesize ion-exchange polymers into MOFs . We report a porous metal−organic framework composite with flexible anion-exchange polymers threaded within the host cavity.[2] Polyvinyl benzyl trimethylammonium hydroxide (PVBTAH) threaded in ZIF-8 (PVBTAH~ZIF-8) is synthesized in steps of chloro-monomer impregnation, in situ polymerization, amination, and alkaline ion exchange. The synthesized non-cross-linked PVBTAH~ZIF-8 material exhibits superior ion-exchange kinetics compared to conventional ion-exchange resins. The open porous structure of MOF allows the physically trapped polymers to contact solvent freely and exchange ions efficiently, as oppose to the conventional ion-exchange resins in which the binding sites are hidden within the polymeric beads, preventing full utilization of ion exchange sites. It has good potential to be applied as a hybrid polymeric electrolyte in advanced fuel cells and flow batteries which demands high ionic selectivity.

[1] T.Uemura, K.Kitagawa, S. Horike, T. Kawamura, S. Kitagawa, M. Mizuno, and K. Endo, “Radical polymerisation of styrene in porous coordination polymers”, Chem. Commun., 48 (2005) 5968-70.
[2] L. Gao, C.Y. V. Li, K.Y. Chan, and Z.N. Chen, "Metal-Organic Framework Threaded with Aminated Polymer Formed in Situ for Fast and Reversible Ion Exchange”,  J. Am. Chem. Soc., 136 (2014) 7209-7212.

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See more of this Session: Adsorbent Materials: MOFs
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