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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Stereochemical Sequence Dictates Unimolecular Diblock Copolymer Assembly.

Matthew R Golder1, Yivan Jiang1, Paul E Teichen1

  • 1Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02143, United States.

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|January 23, 2018
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Stereochemistry significantly influences block copolymer self-assembly. New synthesis methods allow precise control over polymer stereochemical sequences, enabling studies on their impact on material properties.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Understanding block copolymer self-assembly is crucial for materials design.
  • Precise control over polymer sequence and stereochemistry is challenging.
  • Stereochemical sequence effects on self-assembly are not well understood.

Purpose of the Study:

  • To develop methods for synthesizing uniform block copolymers with defined stereochemical sequences.
  • To investigate the role of stereochemistry in block copolymer self-assembly.
  • To correlate polymer stereochemistry with emergent phase behavior.

Main Methods:

  • Iterative exponential growth for synthesizing unimolecular stereoisomeric diblock oligomers.
  • X-ray scattering for characterizing polymer self-assembly and phase behavior.
  • Computational simulations on a theoretical model system for rationalization.

Main Results:

  • Successfully synthesized a library of unimolecular stereoisomeric diblock 32-mers.
  • Demonstrated that stereochemistry modulates the phase behavior of these polymers.
  • Provided a rationalization for stereochemical influence via simulations.

Conclusions:

  • Stereochemical sequence is a critical factor in unimolecular polymer self-assembly.
  • Developed synthetic access to stereochemically defined polymers.
  • Opened new avenues for designing polymers with tailored self-assembly properties.