| 학회 |
한국고분자학회 |
| 학술대회 |
2021년 가을 (10/20 ~ 10/22, 경주컨벤션센터) |
| 권호 |
46권 2호 |
| 발표분야 |
고분자구조 및 물성 |
| 제목 |
Topologically Close-Packed Structures in High-χ PDMS-b-PTFEA Copolymers |
| 초록 |
We introduce a new access to complex low-symmetry Frank-Kasper phases using linear-type high-χ and high-ε block copolymers, where χ and ε are the Flory−Huggins interaction parameter and conformational asymmetry between the two blocks, respectively. Polydimethylsiloxane-b-poly(2,2,2-triflouroethyl acrylate) (PDMS-b-PTFEA) copolymers were precisely synthesized by adjusting the volume fraction of minor PTFEA block (fPTFEA) in the same PDMS block. Using SAXS measurements, we systematically explore the packing structures in the space of temperature versus fPTFEA. As fPTFEA decreases, the sphere-packing phase behavior exhibits the composition dependence of the non-classical sphere-packing phases (A15, σ, and C14) and classical body-centered cubic (BCC) phase. The experimental sequence of sphere-packing phases agrees with the theoretical thermodynamic phase stability of A15−σ−C14−BCC with decreasing fPTFEA, which are subject to both high-χ and high-ε nature of PDMS-b-PTFEAs. |
| 저자 |
전승배1, 전태석1, 이상우2, 이병두3, 류두열1
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| 소속 |
1연세대, 2Rensselaer Polytechnic Institute, 3Argonne National Laboratory |
| 키워드 |
Frank-Kasper phase; High-χ; Block copolymer
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| E-Mail |
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