Degradation versus self-assembly of block copolymer micelles

TL;DR

This paper investigates how the degradation of different blocks in block copolymer micelles affects their stability, size distribution, and self-assembly behavior, using quasi-equilibrium scaling theory to predict these effects.

Contribution

It introduces a theoretical framework to understand how selective degradation influences micelle stability and size, revealing conditions that lead to destabilization or enhanced assembly.

Findings

Degradation of hydrophobic blocks destabilizes micelles and reduces their size.

Degradation of hydrophilic blocks promotes larger micelles and can induce micelle formation from individual chains.

Theoretical predictions align with observed effects of block degradation on micelle properties.

Abstract

The stability of micelles self-assembled from block copolymers can be altered by the degradation of the blocks. Slow degradation shifts the equilibrium size distribution of block copolymer micelles and change their properties. Quasi-equilibrium scaling theory shows that the degradation of hydrophobic blocks in the core of micelles destabilize the micelles reducing their size, while the degradation of hydrophilic blocks forming coronas of micelles favors larger micelles and may, at certain conditions, induce the formation of micelles from individual chains.