Synthesis and Phase Behavior of PS-(PS-b-P2VP)<sub>3</sub> Miktoarm Star Block Copolymer
ORAL
Abstract
Gyroid nanostructures have received much attention because of potential applications for next-generation storage devices and membranes. However, to maximize its structural advantages, gyroid nanostructures with larger channel volumes are needed.
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).
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).
–
Publication: Phase Behavior of PS-(PS-b-P2VP)3 Miktoarm Star Copolymer (Macromolecules, 2021, 54, 7822-7829)
Presenters
-
Dokyung Woo
- Pohang Univ of Sci & Tech