About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
|
Symposium
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6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
Kinetic Pathway of Order-Order Transition in Diblock Copolymer by Time-resolved 3D Electron Microscopy |
Author(s) |
Hsiaofang Wang, Hiroshi Jinnai |
On-Site Speaker (Planned) |
Hsiaofang Wang |
Abstract Scope |
The kinetic pathway of order-order transition (OOT) from hexagonal packing cylinder (HEX) to hexagonal perforated layer (HPL) in polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) is studied by time-resolved transmission electron microtomography (3D-TEM). Our results reveal that the OOT from HEX to HPL through a nucleation and growth process from the metastable initial state. Cylinder domains randomly form a nucleation site by thermal fluctuation. An undulation of the interface induced by the instability grows as an undulating shape to form the intermediate structure. Subsequently, the neighboring intermediate structures approach each other and coalesce into the HPL phase with ABAB…stacking sequence. Self-alignment of HPL orientation can also be visualized during thermal annealing due to entropic consideration. This work provides the first example of the real-time and real-space kinetic pathway of phase transition for soft materials. |
Proceedings Inclusion? |
Definite: Other |