Polymer Cubosomes: Infinite Cubic Mazes and Possibilities.

Area of Science:

• Polymer self-assembly
• Soft matter nanotechnology
• Materials science

Background:

• Block copolymers (BCPs) self-assemble into various soft nanostructures.
• Polymer cubosomes, emerging nanostructures from BCPs, feature triply periodic minimal surfaces (TPMSs) and internal nanochannel networks.
• Previous formation of polymer cubosomes was often serendipitous, limiting their study and application.

Purpose of the Study:

• To describe recent progress in creating polymer cubic mesophases and polymer cubosomes in dilute solution.
• To investigate the role of BCP architecture in preferential formation of polymer cubosomes.
• To explore methods for controlling polymer cubosome structure and potential applications.

Main Methods:

• Utilized BCPs with nonlinear architectures (dendritic-linear, branched-linear, branched-branched).
• Investigated self-assembly in dilute solution with varying block ratios (f < 10%).
• Employed coassembly of BCPs with different block ratios and solvent modulation for structural control.

Main Results:

• BCPs with nonlinear architectures preferentially self-assembled into inverse mesophases, forming polymer cubosomes.
• Decreasing block ratio (f) led to transformations from bilayers to cubic phases (primitive cubic, double diamond) and inverted hexagonal phases.
• BCP architecture, particularly the bulky hydrophilic block, was crucial for inverse mesophase formation by influencing the packing parameter.

Conclusions:

• BCP architecture significantly influences the preferential formation of polymer cubosomes in solution.
• Structural parameters of BCPs and methods like coassembly and solvent modulation allow control over polymer cubosome characteristics.
• Polymer cubosomes show promise for applications such as photonic crystals, chemical reactors, and drug delivery carriers.