{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T10:48:24Z","timestamp":1791888504165,"version":"4.3.4"},"reference-count":63,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T00:00:00Z","timestamp":1791849600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T00:00:00Z","timestamp":1791849600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100003704","name":"Korea Research Institute of Chemical Technology","doi-asserted-by":"publisher","award":["KK2552\u201020"],"award-info":[{"award-number":["KK2552\u201020"]}],"id":[{"id":"10.13039\/501100003704","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003716","name":"Korea Basic Science Institute","doi-asserted-by":"publisher","award":["PG2025039\u201001"],"award-info":[{"award-number":["PG2025039\u201001"]}],"id":[{"id":"10.13039\/501100003716","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Conjugated polymers derive their optoelectronic function from \u03c0\u2010delocalization. However, this feature renders them intrinsically susceptible to photochemical degradation. Here, we show that intrinsic stability can be altered without changing chemical composition by repositioning side chains. In polydiphenylacetylene derivatives, shifting substituents from the para to the meta position increases photostability by more than fivefold. This stability hierarchy, driven by positional isomerism rather than substituent type, persists across chemical modification and in solution and film states. Composition\u2010invariant solvent titration reveals that the enhanced stability of the meta isomer correlates with position\u2010induced conformational changes, specifically increased rigidity and reduced kink formation. Beyond photostability, the meta isomer exhibits greater resistance to high\u2010energy ion\u2010beam irradiation. As a functional demonstration, an unencapsulated surface\u2010contact fluorescent viscosity sensor based on the meta isomer shows a 6.6\u2010fold longer operational lifetime than its para analogue, defined by the time for a 10% loss in sensitivity (T\n                    <jats:sub>90<\/jats:sub>\n                    ), and retains approximately 75% of its initial response slope under prolonged irradiation conditions that nearly eliminate the sensing response of the para isomer. These results establish chain conformation as a key determinant of intrinsic stability and identify positional isomerism as a composition\u2010invariant molecular design rule for improving the reliability of surface\u2010exposed functional conjugated materials.\n                  <\/jats:p>","DOI":"10.1002\/smll.76208","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T10:12:32Z","timestamp":1791886352000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Position Over Composition: Positional Isomerism Enables Encapsulation\u2010Independent Intrinsic Stability in a Conjugated Polymer"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-9028-2016","authenticated-orcid":false,"given":"Eonji","family":"Kim","sequence":"first","affiliation":[{"name":"Reliability Assessment Center for Chemical Materials Korea Research Institute of Chemical Technology (KRICT)  Yuseong\u2010gu Daejeon Republic of Korea"},{"name":"Department of Organic and Nano Engineering, and Human\u2010Tech Convergence Program Hanyang University  Seongdong\u2010gu Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4670-4199","authenticated-orcid":false,"given":"Young\u2010Jae","family":"Jin","sequence":"additional","affiliation":[{"name":"Department of Specialty Chemicals, Division of Specialty and Bio\u2010based Chemicals Technology Korea Research Institute of Chemical Technology (KRICT)  Ulsan Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heesang","family":"Kim","sequence":"additional","affiliation":[{"name":"Reliability Assessment Center for Chemical Materials Korea Research Institute of Chemical Technology (KRICT)  Yuseong\u2010gu Daejeon Republic of 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