Elongation improvement of transparent and flexible surface protective coating using polydimethylsiloxane-anchored epoxy-functionalized siloxane hybrid composite for reliable out-foldable displays

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dc.contributor.authorLee, Hyunhwanko
dc.contributor.authorLee, Yungko
dc.contributor.authorLee, Sun Wooko
dc.contributor.authorKang, Seung-Moko
dc.contributor.authorKim, Yun Hyeokko
dc.contributor.authorJo, Woosungko
dc.contributor.authorKim, Taek-Sooko
dc.contributor.authorJang, Junhoko
dc.contributor.authorBae, Byeong-Sooko
dc.date.accessioned2021-10-18T06:10:30Z-
dc.date.available2021-10-18T06:10:30Z-
dc.date.created2021-10-18-
dc.date.created2021-10-18-
dc.date.issued2021-11-
dc.identifier.citationCOMPOSITES PART B-ENGINEERING, v.225-
dc.identifier.issn1359-8368-
dc.identifier.urihttp://hdl.handle.net/10203/288222-
dc.description.abstractFlexible surface protective coating in out-foldable devices should possess high elongation with high surface hardness. However, the two characteristics in conventional protecting materials are mutually exclusive. Here, we report a simple and effective composite design strategy to realize high elastic, yet still hard out-foldable and transparent surface protective coating material using molecular hybridization between polydimethylsiloxane (PDMS) and epoxy-functionalized siloxane matrix (ESH) via an in situ sol-gel reaction, forming siloxane linkages. Chemically crosslinked PDMS with ESH (P-ESH) makes optical transparency and greatly improves the elongation property while retaining the surface hardness of ESH due to the flexible and long-siloxane backbone of PDMS. As a result, we obtain the high-performance surface protective coating with greatly improved elongation (2.05% of fracture strain, 60% increase of bare ESH) and high surface hardness (pencil hardness: 4H @ 20 mu m thickness). We thoroughly characterize the mechanical behavior of P-ESH combined with microscopic (nano-scratch and nanoindentation tests) and macroscopic views (tensile test with digital image correlation methods). Enhanced elongation property with high surface hardness is induced by fully-recovery characteristics of P-ESH from external force. In addition, the fabricated P-ESH shows excellent reliability under repeated out-folding (5 mm of folding radius), continuous abrasion (steel wool test: 5,000 cycles), acid or base solutions, and ultraviolet irradiation. Our extensible transparent surface protective coating composite provides a great potential for application to next-generation out-foldable devices.-
dc.languageEnglish-
dc.publisherELSEVIER SCI LTD-
dc.titleElongation improvement of transparent and flexible surface protective coating using polydimethylsiloxane-anchored epoxy-functionalized siloxane hybrid composite for reliable out-foldable displays-
dc.typeArticle-
dc.identifier.wosid000703581500005-
dc.identifier.scopusid2-s2.0-85114992069-
dc.type.rimsART-
dc.citation.volume225-
dc.citation.publicationnameCOMPOSITES PART B-ENGINEERING-
dc.identifier.doi10.1016/j.compositesb.2021.109313-
dc.contributor.localauthorKim, Taek-Soo-
dc.contributor.localauthorBae, Byeong-Soo-
dc.contributor.nonIdAuthorLee, Sun Woo-
dc.contributor.nonIdAuthorKang, Seung-Mo-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorFlexible surface protective coating-
dc.subject.keywordAuthorSol-gel siloxane hybrid composite-
dc.subject.keywordAuthorElongation-
dc.subject.keywordAuthorHardness-
dc.subject.keywordAuthorReliability-
dc.subject.keywordPlusANTI-FINGERPRINT PROPERTIES-
dc.subject.keywordPlusOPTICALLY TRANSPARENT-
dc.subject.keywordPlusELASTIC-MODULUS-
dc.subject.keywordPlusCROSS-LINKING-
dc.subject.keywordPlusFILMS-
dc.subject.keywordPlusSILICA-
dc.subject.keywordPlusHARD-
dc.subject.keywordPlusCOLORLESS-
dc.subject.keywordPlusROBUST-
dc.subject.keywordPlusGLASS-

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