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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
Determination of Molar Masses of Polymers II01:27

Determination of Molar Masses of Polymers II

Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...
Determination of Molar Masses of Polymers I01:24

Determination of Molar Masses of Polymers I

Polymerization produces macromolecules with a range of chain lengths due to the random nature of molecular growth processes. As chains form and terminate at different stages, a single polymer sample contains molecules of varying sizes rather than a uniform structure. This variability is described using average molar masses and distribution-related parameters, which together provide a comprehensive understanding of polymer characteristics.The distribution of molar masses plays a critical role in...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Updated: Jun 17, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles
08:44

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Towards a structural characterization of charge-driven polymer micelles.

I K Voets1, R de Vries, R Fokkink

  • 1Wageningen University, Dreijenplein 6, 6703, HB Wageningen, The Netherlands. ilja.voets@unifr.ch

The European Physical Journal. E, Soft Matter
|December 17, 2009
PubMed
Summary

Complex coacervate core micelles (C3Ms) exhibit unique scaling behavior due to their distinct internal structure compared to traditional micelles. These findings challenge existing theories and suggest new models are needed for these novel polymer assemblies.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Traditional micelles self-assemble from polymeric amphiphiles.
  • Novel complex coacervate core micelles (C3Ms) are formed from oppositely charged block copolymers.
  • Understanding C3M structure-property relationships is crucial for advanced materials design.

Purpose of the Study:

  • To investigate the internal structure and scaling behavior of C3Ms.
  • To compare C3M properties with traditional polymeric micelles.
  • To evaluate the applicability of existing and novel scaling theories to C3Ms.

Main Methods:

  • Light scattering experiments.
  • Small-angle neutron scattering (SANS) experiments.
  • Analysis of micellar size and aggregation number dependence on corona block length.

Main Results:

  • C3Ms exhibit scaling behavior inconsistent with predictions for star-like and crew-cut polymeric micelles.
  • Deviations are attributed to high core solvent fraction, low interfacial tension, and high coronal chain solubility in C3Ms.
  • Observed data align better with crossover regime scaling theory and self-consistent field (SCF) theory.

Conclusions:

  • C3Ms possess fundamental structural differences impacting their scaling behavior.
  • Existing scaling theories for polymeric micelles are insufficient for C3Ms.
  • New theoretical frameworks are required to accurately describe C3M self-assembly and properties.