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Reticulation of Block Copolymer Nanostructures from Perforation.

Shih-Lin Yeh¹, Cheng-Yen Chang¹, Rong-Ming Ho¹

¹Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, R.O.C.

ACS Applied Materials & Interfaces

|February 12, 2025

Summary

Researchers studied self-assembly in polystyrene-block-polydimethylsiloxane blends. They identified topological transformations from perforated lamellae to network phases like double diamond and double gyroid using advanced imaging techniques.

Keywords:

PS-b-PDMS controlled self-assembly double diamond double gyroid epitaxial growth hexagonally perforated lamellae

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Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Block copolymers self-assemble into ordered nanostructures.
Metastable phases offer unique opportunities for studying morphological transitions.
Polystyrene-block-polydimethylsiloxane (PS-b-PDMS) is a model system for self-assembly studies.

Purpose of the Study:

To investigate metastable phase formation in PS-b-PDMS blends.
To elucidate the transition mechanisms from perforated lamellae to network phases (double diamond and double gyroid).
To understand the topological transformations during morphological evolution.

Main Methods:

Controlled self-assembly of PS-b-PDMS and its blends with PDMS homopolymer.
Temperature-resolved small-angle X-ray scattering (SAXS) for in-situ monitoring.
3D reconstruction of transmission electron microscopy (TEM) images via electron tomography.

Main Results:

Kinetically trapped phases including hexagonally perforated lamellae (HPL), double diamond (DD), and double gyroid (DG) were obtained.
An epitaxial relationship was identified between HPL and DG/DD phases during transformation.
3D double networks initiate from perforated lamellar structures, forming topological building units.

Conclusions:

The study reveals key topological transformations in the evolution from perforation to reticulation.
Identified epitaxial relationships provide insights into the formation mechanisms of network phases.
This work bridges the understanding of morphological evolution in block copolymer self-assembly.