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Phase Separation Pathways of Chiral Macromolecules at Liquid-Liquid Interfaces
Xiaotong Chen1, Yuchen Yang1, Yunhui Wen2
1Key Laboratory of Functional Polymer Materials of Ministry of Education; Tianjin Key Laboratory of Functional Polymer Materials; Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
Chiral macromolecule phase behavior was studied in poly(L-lactic acid) (PLLA) and poly(D, L-lactic acid) (mPLA) mixtures within double emulsion droplets. Interface properties and copolymer additives control microcapsule structures like eyeball, spindle, and Janus shapes.
Area of Science:
- Polymer Science
- Materials Science
- Physical Chemistry
Background:
- Chiral macromolecule phase behavior is crucial in chemistry, biology, and materials science.
- Understanding phase separation dynamics is key for designing advanced materials.
Purpose of the Study:
- Investigate phase separation in poly(L-lactic acid) (PLLA) and poly(D, L-lactic acid) (mPLA) mixtures within double emulsion droplets.
- Explore how interfacial properties and block copolymers influence microcapsule morphology.
Main Methods:
- Utilized a model system of PLLA and mPLA mixtures in double emulsion droplets.
- Analyzed phase separation dynamics at liquid-liquid interfaces.
- Compared interfacial phase separation with that on a plane substrate.
Main Results:
- High mPLA compositions yielded eyeball-like microcapsules via transient networks or discrete domains.
- Low mPLA compositions resulted in spindle-like microcapsules due to PLLA crystallization.
- PLA-based amphiphilic block copolymers enabled configurable microcapsule structures (eyeball, spindle, Janus).
- Interfacial properties and hydrodynamics significantly affected phase separation dynamics in double emulsions.
Conclusions:
- Clarified phase transition dynamics of PLLA/mPLA mixtures at liquid-liquid interfaces.
- Provided insights into modulating chiral macromolecule phase behavior for structural control.
- Demonstrated the potential for creating tunable microcapsule architectures.
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