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Rapid Commun."],"published-print":{"date-parts":[[2025,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The synthesis of an amphiphilic three\u2010arm block copolymer (AB)<jats:sub>3<\/jats:sub>\u2010BCP, which consists of poly(methyl methacrylate) (PMMA) and poly(butyl methacrylate) (PBMA) in the hydrophobic inner block, is reported. The hydrophilic block segment is based on poly(2\u2010hydroxyethyl methacrylate) (PHEMA) originating from 2\u2010(trimethylsiloxyl)ethyl methacrylate (HEMA\u2010TMS). The preparation is carried out in two steps using a core\u2010first approach. Using atom transfer radical polymerization (ATRP) as a controlled polymerization technique, three (AB)<jats:sub>3<\/jats:sub>\u2010BPCs with HEMA contents of 15 to 38 mol<jats:sup>\u22121<\/jats:sup> % are prepared, applying different reaction conditions. Porous structures are generated from these BCPs by applying a self\u2010assembly and nonsolvent\u2010induced phase separation (SNIPS) protocol. Complex surface structures are observed using scanning electron microscopy (SEM). Bulk morphologies are investigated for a better understanding of the underlying self\u2010assembly. For PHEMA\u2010rich (AB)<jats:sub>3<\/jats:sub>\u2010BCPs, non\u2010regular lamellar microphases are observed in transmission electron microscopy (TEM) and confirmed by small\u2010angle X\u2010ray scattering (SAXS). The porous structures and their expected swelling characteristics are analyzed using atomic force microscopy (AFM) in air and water. Time\u2010resolved measurements in water indicate a rapid swelling after immersion into the water bath. The present study paves the way for exciting porous materials based on the herein synthesized amphiphilic three\u2010arm block copolymers useful for applications as absorber materials and coatings.<\/jats:p>","DOI":"10.1002\/marc.202500077","type":"journal-article","created":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T08:55:58Z","timestamp":1741683358000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Synthesis and Self\u2010Assembly of Pore\u2010Forming Three\u2010Arm Amphiphilic Block Copolymers"],"prefix":"10.1002","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-0456-9507","authenticated-orcid":false,"given":"Sebastian","family":"Pusse","sequence":"first","affiliation":[{"name":"Department of Chemistry Saarland University  66123 Saarbr\u00fccken Germany"},{"name":"Saarene Saarland Center for Energy Materials and Sustainability  Campus C4 2 66123 Saarbr\u00fccken Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1422-3996","authenticated-orcid":false,"given":"Bart\u2010Jan","family":"Niebuur","sequence":"additional","affiliation":[{"name":"INM\u2013Leibniz\u2010Institute for New Materials  Campus D2 2 66123 Saarbr\u00fccken Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2951-1704","authenticated-orcid":false,"given":"Tobias","family":"Kraus","sequence":"additional","affiliation":[{"name":"INM\u2013Leibniz\u2010Institute for New Materials  Campus D2 2 66123 Saarbr\u00fccken Germany"},{"name":"Colloid and Interface Chemistry Saarland University  Campus D2 2 66123 Saarbr\u00fccken Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2181-0590","authenticated-orcid":false,"given":"Volker","family":"Presser","sequence":"additional","affiliation":[{"name":"Saarene Saarland Center for Energy Materials and Sustainability  Campus C4 2 66123 Saarbr\u00fccken Germany"},{"name":"INM\u2013Leibniz Institute for New Materials  66123 Saarbr\u00fccken Germany"},{"name":"Department of Materials Science &amp; 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