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Recyclable RAFT-3D printing.

Xiaofeng Pan1, Xinggang Luo1, Xiangqiang Pan1

  • 1State Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, Department of Polymer Science and Engineering, College of Chemistry Chemical Engineering and Materials Science, Soochow University China chemjji@suda.edu.cn chemzhujian@suda.edu.cn.

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Summary
This summary is machine-generated.

This study presents a recyclable 3D printing method using reversible addition-fragmentation chain transfer (RAFT) step-growth polymerization. The system allows for material recycling and upcycling, creating a sustainable polymer manufacturing platform.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Manufacturing

Background:

  • Polymer manufacturing faces sustainability challenges, necessitating recyclable 3D printing solutions.
  • Current methods often lack efficient recycling pathways for 3D printed polymer objects.

Purpose of the Study:

  • To develop a closed-loop 3D printing strategy utilizing reversible addition-fragmentation chain transfer (RAFT) step-growth polymerization.
  • To demonstrate the recyclability and upcyclability of 3D printed polymer networks through dynamic covalent chemistry.

Main Methods:

  • Incorporation of dynamic trithiocarbonate linkages into polymer networks via RAFT polymerization.
  • Recycling and regeneration of polymer networks using 405 nm irradiation and excess RAFT agents.
  • Re-crosslinking of regenerated oligomers with vinyl monomers for material reconstruction and upcycling.
  • Digital Light Processing (DLP)-based 3D printing of developed resins.

Main Results:

  • Achieved a closed-loop recyclable 3D printing system with tunable mechanical properties (Young's modulus: 0.78–835 MPa).
  • Demonstrated successful regeneration of reactive oligomers and subsequent re-crosslinking into original or upcycled polymer structures.
  • Showcased post-printing functionalization and erasure capabilities, highlighting the dynamic and "living" nature of the system.
  • Validated a catalyst-free, modular approach eliminating the need for specialized dynamic covalent monomers.

Conclusions:

  • The developed RAFT-based 3D printing strategy offers a practical and sustainable platform for recyclable polymer manufacturing.
  • The system enables efficient material recycling and upcycling, addressing key sustainability challenges in 3D printing.
  • The "living" and dynamic nature of the polymer network provides versatility for post-printing modifications and material design.