Stacked layer to gyroid structures in partially fluorinated PS-B-PTBMA copolymer films
- 주제(키워드) Block copolymer , Fluorination , Gyroid , HML , HPL , Phase transition
- 등재 SCIE, SCOPUS
- 발행기관 Tokai University
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000175024
- 본문언어 영어
- Published As http://dx.doi.org/10.2494/photopolymer.33.523
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Partial fluorination of polystyrene-b-poly(tert-butyl methacrylate) (PS-b-PtBMA) copolymer was carried out to form PS-b-P(tBMA-r-TFEMA-r-MAA), where TFEMA and MAA denote 2,2,2-trifluoroethyl methacrylate and methacrylic anhydride units, respectively. Phase transitions of a partially (40%) fluorinated copolymer were investigated both in bulk and film using X-ray scattering techniques. The bulk transition pathways showed lamellae to hexagonally perforated layer (HPL) to gyroid (GYR) as temperature increases, although the volumetric ratio between the two blocks is still close to symmetric composition. Meanwhile in copolymer film, the interfacial interactions at air surface altered temperature-increasing transition pathways including HPL to hexagonally modulated layer (HML). However, the suppressed GYR was recovered in isothermal condition of HML at 240oC, while remaining the same HPL in isothermal condition at 140oC, indicating that a HML is less stable in thick films. © 2020SPST.
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