ABC-Type Triblock Copolyacrylamides via Copper-Mediated Reversible Deactivation Radical Polymerization.

Area of Science:

• Polymer Chemistry
• Materials Science
• Organic Synthesis

Background:

• Reversible deactivation radical polymerization (RDRP) is crucial for synthesizing well-defined polymers.
• Developing efficient aqueous RDRP methods is essential for sustainable polymer synthesis.
• Controlled synthesis of triblock copolymers with specific sequences remains a challenge.

Purpose of the Study:

• To report an aqueous Cu(0)-mediated RDRP for synthesizing sequence-controlled triblock copolymers.
• To achieve ultrafast, one-pot synthesis without intermediate purification steps.
• To investigate and minimize undesirable side reactions affecting the living polymerization.

Main Methods:

• Utilized aqueous Cu(0)-mediated RDRP at 0.0 °C.
• Synthesized triblock copolymers initiated from PHEAA or PDMA, incorporating HEAA, NIPAM, and DMA monomers.
• Employed iterative sequential monomer addition after full conversion in a one-pot process.
• Exploited CuBr disproportionation with Me6TREN in water for controlled initiation.

Main Results:

• Achieved well-defined ABC-type triblock copolymers with controlled chain lengths and narrow molecular weight distributions (Đ ~1.10).
• Demonstrated quantitative monomer conversion in as little as 52 minutes.
• Confirmed high end-group fidelity and absence of significant side reactions.
• Successfully incorporated multiple functional monomers without compromising the living nature of the polymerization.

Conclusions:

• The developed aqueous Cu(0)-mediated RDRP offers a versatile and efficient route to sequence-controlled triblock copolymers.
• The one-pot, iterative approach significantly accelerates polymer synthesis while maintaining high control.
• This method holds promise for the facile synthesis of complex polymer architectures for various applications.