Angew Chem Int Ed Engl. 2017 Apr 10;56(16):4452-4457. doi: 10.1002/anie.201612440. Epub 2017 Mar 22.

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

Angewandte Chemie (International ed. in English)

Qianming Lin, Xisen Hou, Chenfeng Ke

PMID: 28326657 DOI: 10.1002/anie.201612440

Abstract

Amplification of molecular motions into the macroscopic world has great potential in the development of smart materials. Demonstrated here is an approach that integrates mechanically interlocked molecules into complex three-dimensional (3D) architectures by direct-write 3D printing. The design and synthesis of polypseudorotaxane hydrogels, which are composed of α-cyclodextrins and poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers, and their subsequent fabrication into polyrotaxane-based lattice cubes by 3D printing followed by post-printing polymerization are reported. By switching the motion of the α-cyclodextrin rings between random shuttling and stationary states through solvent exchange, the polyrotaxane monolith not only exhibits macroscopic shape-memory properties but is also capable of converting the chemical energy input into mechanical work by lifting objects against gravity.

© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: 3D printing; cyclodextrins; mechanically interlocked molecules; rotaxanes; supramolecular chemistry

Publication Types

• Journal Article
• Research Support, Non-U.S. Gov't