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A polystyrene\u2010<jats:italic>block<\/jats:italic>\u2010poly(methacrylic acid) diblock copolymer is synthesized first via a one\u2010pot solution\u2013emulsion reversible addition\u2013fragmentation chain transfer polymerization. A subsequent Steglich esterification yields the CE functionalized polymer. The complexation properties with different alkali metals are first investigated by liquid\u2212liquid extraction (LLE) in dichloromethane (DCM) \u2212\u00a0water systems using free benzo\u20109\u2010crown (B9C3), benzo\u201012\u2010crown\u20104 (B12C4), and benzo\u201015\u2010crown\u20105 (B15C5) CEs as reference components, followed by the correspondingly CE\u2010functionalized polymers. Extraction complexation constants in the aqueous phase are determined and the impact of the complexation constants on the extractability is estimated. The B9C3 CE is especially appealing since it has the smallest cavity size among all CEs. It is too small to complex sodium or potassium ions; however, it forms sandwich complexes with a lithium\u2010ion resulting in extraordinary complexation constants in polymer systems avoiding other interfering alkali metal ions. On this basis, a new material for the efficient extraction of lithium ion traces in global water resources is established.<\/jats:p>","DOI":"10.1002\/marc.202000746","type":"journal-article","created":{"date-parts":[[2021,3,1]],"date-time":"2021-03-01T09:51:26Z","timestamp":1614592286000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["A Highly Selective Polymer Material using Benzo\u20109\u2010Crown\u20103 for the Extraction of Lithium in Presence of Other Interfering Alkali Metal Ions"],"prefix":"10.1002","volume":"42","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2185-6513","authenticated-orcid":false,"given":"Iklima","family":"Oral","sequence":"first","affiliation":[{"name":"Institute of Physical Chemistry Universit\u00e4t Hamburg  Martin\u2010Luther\u2010King\u2010Platz 6 Hamburg 20146 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