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Stacked Layer to Gyroid Structures in Partially Fluorinated PS-b-PtBMA Copolymer Films
- Title
- Stacked Layer to Gyroid Structures in Partially Fluorinated PS-b-PtBMA Copolymer Films
- Authors
- Jo, Seongjun; Kim, Yeongsik; Jo, Seungyun; Kim, Kyungkon; Ryu, Du Yeol
- Ewha Authors
- 김경곤
- SCOPUS Author ID
- 김경곤
- Issue Date
- 2020
- Journal Title
- JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
- ISSN
- 0914-9244
1349-6336
- Citation
- JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY vol. 33, no. 5, pp. 523 - 528
- Keywords
- Block copolymer; Fluorination; Phase transition; HPL; HML; Gyroid
- Publisher
- TECHNICAL ASSOC PHOTOPOLYMERS,JAPAN
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- 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 240 degrees C, while remaining the same HPL in isothermal condition at 140 degrees C, indicating that a HML, is less stable in thick films.
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- 자연과학대학 > 화학·나노과학전공 > Journal papers
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