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Small-Molecule Modulation of Soft-Matter Frank-Kasper Phases: A Method for Adding Function to Form.

Kätchen K Lachmayr1, Lawrence R Sita1

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA.

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|December 21, 2019
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Summary

Adding vitamin E to a sugar-polyolefin conjugate controls its phase behavior. This allows for the creation of complex soft matter structures with new functionalities.

Keywords:
Frank-Kasper phasesmolecular modulationself-assemblysugar-polyolefin conjugatevitamin E

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Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Cellobiose-triazole-linked atactic poly(4-methyl-1-pentene) (CB-aPMP) is a sugar-polyolefin conjugate.
  • Controlling the thermotropic phase behavior of such materials is crucial for developing advanced soft matter.
  • Frank-Kasper (FK) phases, like A15 and σ, represent complex soft matter structures.

Purpose of the Study:

  • To investigate the effect of α-tocopherol (vitamin E) on the thermotropic phase behavior of CB-aPMP.
  • To explore the potential for external control over soft matter phase formation.
  • To enable the design of complex soft matter structures with enhanced functionalities.

Main Methods:

  • Blending small amounts of α-tocopherol with CB-aPMP.
  • Analyzing the thermotropic phase behavior of the resulting blends.
  • Characterizing the formation of Frank-Kasper A15 and σ phases.

Main Results:

  • Small additions of α-tocopherol effectively controlled the thermotropic phase behavior of CB-aPMP.
  • The incorporation of vitamin E provided access to non-canonical soft matter phases, specifically A15 and σ FK phases.
  • A paradigm was established for controlling soft matter phase formation.

Conclusions:

  • α-tocopherol serves as a valuable additive for externally controlling the phase behavior of CB-aPMP.
  • This approach facilitates the development of scalable quantities of complex soft matter FK phases.
  • The findings pave the way for designing soft matter with increased structural complexity and functional capabilities.