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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Synthesizing sequence-defined polymers with cationic backbones presents significant challenges.
  • Precise control over polymer structure is crucial for advanced material properties and applications.

Purpose of the Study:

  • To develop a scalable and efficient method for synthesizing sequence-defined cationic polymers.
  • To characterize the precise structure and properties of these novel polymers.
  • To explore their potential in information transmission and bioapplications.

Main Methods:

  • Alternating Menschutkin reaction and copper-catalyzed azide-alkyne cycloaddition.
  • Utilizing a polar-inverse strategy (PIS) for purification without protecting groups or solid support.
  • Characterization using Maldi-Tof mass spectrometry for sequence decoding.

Main Results:

  • Successfully synthesized scalable cationic sequence-defined polymers with up to 12 repeating units and quaternary ammonium backbones.
  • Achieved high yields (up to 68% over 12 steps, >95% per step) via the PIS method.
  • Demonstrated high programmability of polymer structure (backbone, sequence, side groups, terminals, topology) and facile sequence information decoding.
  • Resulting polymers are water-soluble, positively charged, and suitable for bioapplications.

Conclusions:

  • The developed method provides a cost-effective and scalable route to precisely synthesized cationic sequence-defined polymers.
  • The polymers exhibit excellent programmability and facile sequence decoding, enabling new possibilities in information storage and retrieval.
  • These water-soluble, cationic polymers show promise for diverse bioapplications, including DNA condensation, gene transfection, and drug delivery.