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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Poloxamers are non-ionic block copolymers widely used in pharmaceutical and biomedical applications.
  • Understanding co-micellization behavior is crucial for optimizing their formulation and function.
  • Binary mixtures of poloxamers can exhibit complex self-assembly behaviors in aqueous solutions.

Purpose of the Study:

  • To investigate the co-micellization of binary poloxamer mixtures using dissipative particle dynamics (DPD) simulations.
  • To examine the influence of block length similarity and concentration on micelle formation, type, size, shape, and composition.
  • To analyze the specific behavior of poloxamer F127/L64 mixtures, including the role of L64 below its critical micelle concentration (CMC).

Main Methods:

  • Dissipative Particle Dynamics (DPD) simulations were employed.
  • Four binary poloxamer mixtures (F127/P123, F127/P105, P123/P84, F127/L64) were simulated in dilute aqueous solution.
  • Simulation parameters were adjusted to accurately represent interactions and observe self-assembly.

Main Results:

  • Pure and mixed ellipsoidal micelles were found to coexist for all investigated poloxamer mixtures.
  • At similar concentrations, both pure micelles and mixed micelles formed.
  • In the F127/L64 system, L64 chains incorporated into mixed micelles even below their CMC, albeit at a lower fraction compared to other systems.
  • Higher proportions of mixed micelles were observed when the concentrations of the two poloxamer species were similar.

Conclusions:

  • DPD simulations provide valuable insights into the co-micellization behavior of poloxamer binary mixtures.
  • The relative concentrations of poloxamers significantly influence the formation and proportion of mixed micelles.
  • Shorter poloxamer chains may preferentially locate at the interface of mixed micelles, influencing their structure.