Scalable Synthesis of Positively Charged Sequence-Defined Functional Polymers

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.