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Ring Shuttling Controls Macroscopic Motion in a Three-Dimensional Printed Polyrotaxane Monolith.

Qianming Lin1, Xisen Hou1, Chenfeng Ke1

  • 1Department of Chemistry, Dartmouth College, 41 College Street, Hanover, NH, 03755, USA.

Angewandte Chemie (International Ed. in English)
|March 23, 2017
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Summary

Researchers developed smart materials by 3D printing mechanically interlocked molecules. These polypseudorotaxane hydrogels exhibit shape-memory properties and can convert chemical energy into mechanical work, demonstrating amplified molecular motion at a macroscopic scale.

Keywords:
3D printingcyclodextrinsmechanically interlocked moleculesrotaxanessupramolecular chemistry

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Amplifying molecular motion is key for developing advanced smart materials.
  • Mechanically interlocked molecules offer unique properties for material design.

Purpose of the Study:

  • To integrate mechanically interlocked molecules into 3D architectures using direct-write 3D printing.
  • To create novel polyrotaxane-based materials with macroscopic functionalities.

Main Methods:

  • Synthesized polypseudorotaxane hydrogels from alpha-cyclodextrins and PEO-PPO-PEO triblock copolymers.
  • Fabricated polyrotaxane lattice cubes using direct-write 3D printing.
  • Utilized post-printing polymerization and solvent exchange for material actuation.

Main Results:

  • Successfully 3D printed complex 3D architectures with mechanically interlocked molecules.
  • Demonstrated macroscopic shape-memory properties in polyrotaxane monoliths.
  • Showcased the ability to convert chemical energy into mechanical work, lifting objects against gravity.

Conclusions:

  • Direct-write 3D printing enables the fabrication of sophisticated smart materials from mechanically interlocked molecules.
  • The developed polyrotaxane hydrogels exhibit controllable macroscopic properties, including shape memory and energy conversion.
  • This approach opens new avenues for designing responsive materials with tunable mechanical work capabilities.