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Two Structurally Different Polymers from a Single Monomer.

Javed R Pathan1, Subhrajyoti Bhandary1, Kana M Sureshan1

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Summary
This summary is machine-generated.

Researchers synthesized a novel malonamide monomer for topochemical polymerization, yielding two distinct nylon-like polymers with different structures and topologies via azide-alkyne cycloaddition. This groundbreaking work enables precise control over polymer architecture.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Crystallography

Background:

  • Topochemical polymerization offers a route to crystalline polymers with controlled structures.
  • Azide-alkyne cycloaddition is a versatile click chemistry reaction for polymer synthesis.

Purpose of the Study:

  • To design and synthesize a malonamide-derived monomer for topochemical polymerization.
  • To investigate the formation of two distinct polymer structures from a single monomer.
  • To elucidate the atomic-level details of the polymerization process and resulting polymer topologies.

Main Methods:

  • Synthesis of a malonamide monomer featuring azide and alkyne functionalities.
  • Crystallization to obtain two polymorphs (M1 and M2).
  • Single-crystal X-ray diffraction to analyze crystal structures and polymerization pathways.
  • Thermal analysis to induce topochemical polymerization.

Main Results:

  • Two concomitant polymorphs (M1 and M2) of the monomer were obtained.
  • Both polymorphs underwent topochemical azide-alkyne cycloaddition polymerization.
  • Polymorph M1 yielded a 1,4-disubstituted triazolyl-linked polymer, with polymerization perpendicular to hydrogen bonds.
  • Polymorph M2 yielded a 1,5-disubstituted triazolyl-linked polymer, with polymerization along hydrogen bonds.
  • Two structurally isomeric polymers with distinct topologies were synthesized via single-crystal-to-single-crystal transformations.

Conclusions:

  • This study reports the first topochemical synthesis of two structurally isomeric polymers from a single monomer.
  • The crystal packing dictates the regiochemistry and topology of the resulting polymers.
  • Single-crystal-to-single-crystal polymerization provides atomic-resolution insights into polymer formation.