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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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Summary

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.

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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.