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Updated: Dec 8, 2025

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A magnetic solder for assembling bulk covalent adaptable network blocks.

Shuai Zhang1, Yubai Zhang1, Yahe Wu1

  • 1The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education) , Department of Chemistry , Tsinghua University , Beijing 100084 , China . Email: jiyan@mail.tsinghua.edu.cn ;

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|September 21, 2020
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Summary
This summary is machine-generated.

Researchers developed a novel welding technique for Covalent Adaptable Networks (CANs). This method enables the creation of complex, multi-material 3D structures, enhancing reprocessing and recycling capabilities for advanced polymer applications.

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Area of Science:

  • Polymer Science
  • Materials Science

Background:

  • Covalent adaptable networks (CANs) are recyclable polymers with potential in soft robotics, flexible electronics, and biomedical engineering.
  • Fabricating complex, multi-material CAN structures remains a significant challenge.

Purpose of the Study:

  • To develop a versatile welding technique for constructing complex 3D CAN structures.
  • To enable the fabrication of heterogeneous multi-material devices from CANs.

Main Methods:

  • A novel welding technique utilizing a solder doped with magnetic nanoparticles was employed.
  • The solder initiates a bond exchange reaction at the interface of CAN pieces.
  • This method allows for welding both identical and dissimilar CAN materials.

Main Results:

  • Successfully fabricated complex 3D CAN structures with intricate geometries.
  • Demonstrated the ability to weld CAN bulks of different physical properties and chemical compositions.
  • The technique proved effective for repairing damaged CAN materials and recycling scrap.

Conclusions:

  • The developed welding strategy offers a robust and universal method for creating complex and multi-material CAN structures.
  • This advancement is expected to significantly expand the applications of CANs in functional polymer fields.
  • The technique supports sustainable material use through efficient recycling and repair.