Recyclable Graft Polymer Enabled by RAFT Step-Growth Polymerization and Deconstruction

Area of Science:

• Polymer Chemistry
• Materials Science
• Sustainable Chemistry

Background:

• Graft polymers offer unique properties but suffer from poor recyclability, hindering environmental sustainability.
• Current recycling methods for graft polymers are limited and often result in material degradation.

Purpose of the Study:

• To develop a strategy for synthesizing, deconstructing, and reconstructing graft polymers for enhanced recyclability.
• To establish a circular recycling platform for graft polymers that maintains precise architectural control.

Main Methods:

• Utilized grafting-through reversible addition-fragmentation chain transfer (RAFT) step-growth polymerization.
• Synthesized polystyrene macromonomers with trithiocarbonate (TTC) units via RAFT polymerization.
• Employed RAFT interchange for efficient main-chain deconstruction and reconstruction.

Main Results:

• Successfully synthesized graft polymers with uniform TTC linkages in the backbone.
• Achieved efficient main-chain deconstruction into well-defined macromonomers under mild conditions.
• Demonstrated high-yield deconstruction-reconstruction cycles, enabling circular recycling.

Conclusions:

• The developed RAFT-based strategy provides a simple and effective platform for recyclable graft polymers.
• This approach offers precise architectural control, crucial for advanced macromolecular materials.
• Establishes new opportunities for the sustainable design and circular economy of polymers.