Morphological Control and Formation Kinetics of Polymer-Induced Self-Assembly in Binary Mixed Solvents

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Polymerization-induced self-assembly (PISA) integrates polymerization and self-assembly for nanoscale structures.
• PISA offers operational simplicity, high efficiency, and controllable nanostructure morphology.
• Expanding achievable aggregate morphologies and understanding kinetic mechanisms are key research areas.

Purpose of the Study:

• Investigate the regulatory mechanisms of binary mixed solvents in PISA systems.
• Clarify the kinetic perspective of morphological control in PISA.
• Expand the range of achievable aggregate morphologies in PISA.

Main Methods:

• In silico research (computational modeling) to study PISA systems.
• Analysis of binary mixed solvent effects on polymer solubility and aggregate formation.
• Correlation of simulation results with experimental observations.

Main Results:

• Incorporating a second solvent with affinity for solvophobic blocks induces large interconnected micelles.
• The second solvent preferentially interacts with the core, promoting micelle extension and fusion.
• Increased monomer feed ratio and polymer molecular weight lead to micelle fusion into hollow vesicular structures.

Conclusions:

• Binary mixed solvents significantly expand the diversity of PISA aggregate morphologies.
• The preferential solvation of solvophobic blocks by the second solvent is crucial for morphological control.
• This study provides new insights into the kinetic mechanisms governing PISA in mixed solvent systems.