Controllable hierarchical microstructures self-assembled from multiblock copolymers confined in thin films.

Area of Science:

• Materials Science
• Polymer Science
• Computational Chemistry

Background:

• Hierarchical microstructures are crucial for advanced material properties.
• Self-assembly of block copolymers offers a route to complex morphologies.
• Confinement effects can significantly alter self-assembly behavior.

Purpose of the Study:

• To explore hierarchical microstructures from A(BC)n multiblock copolymers under confinement.
• To investigate the influence of confinement on lamellar orientation and coexistence.
• To understand the dynamics of hierarchical microstructure formation.

Main Methods:

• Dissipative particle dynamics (DPD) simulations were employed.
• System involved A(BC)n multiblock copolymers confined between two solid surfaces.
• Film thickness was varied to study morphological changes.

Main Results:

• Confinement enabled the generation of hierarchical microstructures with diverse lamellar arrangements (parallel, perpendicular).
• Coexistence of different hierarchical lamellae was observed by tuning film thickness.
• Microstructure formation proceeds stepwise, with small-length-scale structures forming after large-scale ones.

Conclusions:

• Confinement is a powerful strategy for controlling hierarchical microstructure formation in block copolymers.
• The stepwise dynamics of formation provide insights into the self-assembly process.
• Findings guide the controllable manufacture of advanced hierarchical materials.