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Rapid Commun."],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Lammelar orientation during crystallization in poly(ethylene oxide) (PEO) thin films is governed by three competing mechanisms, which we elucidate using pseudo\u2010polyrotaxane nanosheets (PPRNSs) and their end\u2010capped analogues (cPPRNSs) as model fillers. Shear forces during processing favor edge\u2010on lamellae, while confinement at high filler loadings promotes flat\u2010on orientation. PPRNSs introduce a third mechanism\u2010homoepitaxial templating\u2010that directs flat\u2010on crystallization through specific matrix\u2010filler interactions absent in cPPRNSs. Systematic orientation analysis before and after thermal recrystallization reveals distinct switching behaviors. cPPRNS composites exhibit edge\u2010on lamellae initially, which transition to mixed or flat\u2010on orientations upon recrystallization depending on filler concentration. In contrast, PPRNSs impose flat\u2010on orientation directly during processing at sufficiently high filler loading and maintain robust flat\u2010on orientation after thermal recrystallization across the investigated concentration range. These findings establish predictive guidelines for tuning lamellar orientation in ultrathin polymer films, with implications for flexible electronics, optical devices, and barrier materials.<\/jats:p>","DOI":"10.1002\/marc.70367","type":"journal-article","created":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T04:18:53Z","timestamp":1784780333000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Crystallization in Poly(Ethylene Oxide) Thin Films: Roles\u00a0of Shear, Confinement, and Homoepitaxy"],"prefix":"10.1002","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2677-0180","authenticated-orcid":false,"given":"Cong","family":"Liu","sequence":"first","affiliation":[{"name":"Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo  Kashiwa Chiba Japan"},{"name":"Research Center For Macromolecules and Biomaterials National Institute for Materials 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