Cylindrical to Lamellar Microdomain Order to Order Transition upon Heating for Upper Critical Ordering Transition Block Copolymer

ORAL

Abstract

For block copolymers with upper critical ordering transition (UCOT) where χ decreases with increasing temperature, the sequence of order to order transition (OOT) upon heating of AB diblock and A1BA2 triblock copolymers with UCOT is as follows: lamellae to gyroids to cylinders to spheres before order to disorder transition. However, the opposite direction OOT is impossible in UCOT block copolymers.
Here, we investigated the OOT of polystyrene-block-polyisoprene-block-polystyrene-block-polyisoprene (S1I1S2I2) linear tetrablock copolymer. Very interestingly, this block copolymer showed cylindrical to lamellar microdomains transition upon heating. This behaviour is the exactly opposite to commonly observed OOT for linear AB diblock and A1BA2 triblock copolymers with upper critical ordering transition, where lamellar microdomains have been transformed to cylindrical microdomains upon heating. This interesting transition sequence is due to the chain architecture of linear tetrablock copolymer with two PS and two PI blocks.

*This work was supported by the National Creative Research Initiative Program, the National Research Foundation of Korea (2013R1A3A2042196), and the National Natural Science Foundation of China (Grants Nos 21574026 and 21774025).

–

Presenters

  • Seonghyeon Ahn

    • Department of Chemical Engineering, Pohang Univ of Sci & Tech

Authors

  • Seonghyeon Ahn

    • Department of Chemical Engineering, Pohang Univ of Sci & Tech

  • Yeseong Seo

    • Department of Chemical Engineering, Pohang Univ of Sci & Tech

  • Chao Duan

    • Department of Macromolecular Science, Fudan University

  • Lixun Zhang

    • Department of Macromolecular Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Fudan Univ, Shanghai, China
    • Department of Macromolecular Science, Fudan University

  • Wei-hua Li

    • Department of Macromolecular Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University
    • Macromolecular Science, Fudan Univ
    • Department of Macromolecular Science, Fudan University
    • State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan Univ, Shanghai, China
    • Department of Macromolecular Science, Fudan University, Shanghai, China
    • Department of Macromolecular Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, China.

  • JinKon Kim

    • Department of Chemical Engineering, Pohang Univ of Sci & Tech