Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T15: Block Copolymer Self-Assembly
11:30 AM–2:30 PM,
Thursday, March 9, 2023
Room: Room 207
Sponsoring
Unit:
DPOLY
Chair: Shuyi Xie, Univ of California, Santa Barbara
Abstract: T15.00010 : Synthesis and Phase Behavior of PS-(PS-b-P2VP)3 Miktoarm Star Block Copolymer*
1:18 PM–1:30 PM
Presenter:
Dokyung Woo
(Pohang Univ of Sci & Tech)
Authors:
Dokyung Woo
(Pohang Univ of Sci & Tech)
Yeseong Seo
(Pohang Univ of Sci & Tech)
Luyang Li
(Fudan Univ)
Weihua Li
(Fudan Univ)
In this study, we synthesized polystyrene-[polystyrene-b-poly(2-vinylpyridine)]3 miktoarm star block copolymer [PSL-(PSS-b-P2VP)3] where PSL and PSS are long and short PS chains, respectively. We changed the volume fraction of the PS block (fPS) and the chain asymmetry of the PS chain [τ = fPS,L/(fPS,L+fPS,S)]. When both fPS and τ are large (fPS = 0.81, τ = 0.79), highly asymmetric lamellar structure is observed. Interestingly, when the fPS becomes smaller (fPS = 0.64), gyroid structure is preferred at large τ (τ = 0.65), but lamellar structure is formed with decreasing τ (τ = 0.46). The experimental results are consistent with the predictions based on self-consistent field theory (SCFT).
*National Creative Research Initiative Program supported by the National Research Foundation of Korea (Grant No. 2022R1A3A3002149) funded by the Korean Government. National Natural Science Foundation of China (NSFC) (Grant No. 21925301).
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