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Covalent Adaptable Networks with Mobile Cross-linking Points.

Li Yang1, Wenbin Wang1, Yuanhao Wang1

  • 1State Key Laboratory of Synergistic Chem-Bio Synthesis, Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.

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Summary

We developed polyrotaxane-based covalent adaptable networks (PRCANs) with mobile dynamic cross-links. These PRCANs offer superior mechanical properties and significantly lower processing temperatures compared to traditional CANs.

Keywords:
Covalent adaptable networksDynamic boronic ester bondsMain‐chain polyrotaxanesMobile cross‐linking pointsReprocessability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Covalent adaptable networks (CANs) are promising for sustainable materials but face challenges in balancing processability and mechanical performance.
  • Existing CANs often require high processing temperatures and exhibit limited mechanical resilience.

Purpose of the Study:

  • To introduce a novel class of polyrotaxane-based CANs (PRCANs) utilizing mobile dynamic cross-linking points.
  • To investigate how mobile dynamic cross-links influence mechanical properties and processing temperatures in CANs.

Main Methods:

  • Synthesized PRCANs with mechanically interlocked axles featuring dynamic boronic ester bonds.
  • Compared the mechanical performance (elongation at break, tensile strength, toughness) and reprocessing characteristics of PRCANs against control samples with fixed cross-links.

Main Results:

  • PRCANs demonstrated significantly enhanced mechanical performance, with twice the elongation at break and tensile strength, and over four times the toughness compared to controls.
  • The mobile cross-linking points in PRCANs reduced the required processing temperature (110°C for 10 min) compared to controls (140°C for 30 min).
  • Mobile dynamic covalent bonds in PRCANs facilitate efficient energy dissipation under stress.

Conclusions:

  • Polyrotaxane-based CANs with mobile dynamic cross-links offer a viable strategy to overcome the limitations of traditional CANs.
  • PRCANs present a new platform for developing high-performance, easily processable, and sustainable materials.