Co-existing morphologies of lamellae and double arrays of cylinders by A1BA2C tetrablock terpolymer
Hyeongkeon Yoon,
Qingshu Dong,
Chungryong Choi,
Seonghyeon Ahn,
Soyeong Park,
Eunyoung Kim,
Weihua Li,
Jin Kon Kim
Affiliations
Hyeongkeon Yoon
National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
Qingshu Dong
State Key Laboratory of Molecular Engineering of Polymers, Key Laboratory of Computational Physical Sciences, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
Chungryong Choi
Department of Polymer Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 39177, South Korea
Seonghyeon Ahn
National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
Soyeong Park
National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
Eunyoung Kim
National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
Weihua Li
State Key Laboratory of Molecular Engineering of Polymers, Key Laboratory of Computational Physical Sciences, Department of Macromolecular Science, Fudan University, Shanghai 200433, China; Corresponding authors.
Jin Kon Kim
National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea; Corresponding authors.
Here, we observed, via small-angle X-ray scattering and transmission electron microscopy, co-existing morphologies of lamellae and cylinders by precisely tailoring the volume fraction of each block in polystyrene-b-polyisoprene-b-polystyrene-b-poly(2-vinylpyridine) tetrablock terpolymer (S1IS2V). The PI cylinders are located inside the PS microdomains. This is due to the presence of the mid-block PS2 which effectively isolates PI cylinders from the interface between PS and P2VP lamellae. The experimentally observed morphology is in good agreement with the predicted phase by self-consistent field theory. Furthermore, we successfully adjusted the position of the PI cylinders inside the PS lamellar microdomains by changing the length of the PS2 mid-block. Finally, we obtained vertically oriented lamellae and cylinders in S1IS2V films with the aid of solvent annealing.
