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Published on: July 9, 2015
Liquid-solid transition in a model hard sphere system of block copolymer micelles
V Castelletto1, C Caillet, I W Hamley
1Department of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom.
This study reveals a phase coexistence region between micellar liquid and crystalline solids in amphiphilic diblock copolymers, challenging previous percolation models. The hard sphere model accurately describes this transition.
Area of Science:
- Materials Science
- Polymer Chemistry
- Soft Matter Physics
Background:
- Amphiphilic diblock copolymers form complex structures in solution.
- Understanding phase transitions is crucial for material design.
Purpose of the Study:
- Investigate the transition between micellar liquid and crystalline solid phases.
- Clarify the underlying mechanisms governing this phase change.
Main Methods:
- Small-angle X-ray scattering (SAXS) for structural analysis.
- Rheology to probe mechanical properties and flow behavior.
Main Results:
- The system is accurately modeled by the hard sphere model.
- No evidence of percolation driven by attractive interactions was found.
- A distinct coexistence region between liquid and crystal phases was identified.
Conclusions:
- The hard sphere model provides a robust description of the phase transition.
- Phase coexistence, not percolation, governs the transition from micellar liquid to crystalline solid.
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