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Digitally encoded polyurethanes form single crystals, with digital coding slightly affecting crystal spacing. Blends of these polyurethanes form segregated crystals, not cocrystals.

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Area of Science:

  • Polymer Science
  • Crystallography
  • Materials Science

Background:

  • Polyurethanes are versatile polymers with applications in various fields.
  • Understanding their crystallization behavior is crucial for tailoring material properties.
  • Digital encoding offers a novel approach to designing polymer structures.

Purpose of the Study:

  • To investigate the crystallization of digitally encoded polyurethanes using electron diffraction.
  • To analyze the influence of primary structure and digital coding on crystal formation.
  • To examine the crystallization behavior of blends of differently encoded oligourethanes.

Main Methods:

  • Electron diffraction was employed to study the crystallization of polyurethane oligomers.
  • A series of oligomers with varying primary structures were synthesized and analyzed.
  • Crystallization of blends of oligourethanes with different coded primary structures was investigated.

Main Results:

  • All analyzed oligourethanes formed hydrogen-bonding-directed lamellar single crystals with a base-centered orthorhombic unit cell.
  • Digital coding showed a minor impact on the intersheet distance within the crystals.
  • The volume occupied by a basic information unit was calculated to be 148-188 ų.
  • Blends of oligourethanes with different compositions formed segregated crystals, not cocrystals.

Conclusions:

  • Digitally encoded polyurethanes exhibit predictable lamellar single crystal formation.
  • The digital information content influences crystal lattice parameters, specifically intersheet distance.
  • Blends of dissimilar encoded polyurethanes tend to segregate rather than form cocrystals, indicating distinct domain formation.