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Ring Shuttling Controls Macroscopic Motion in a Three‐Dimensional Printed Polyrotaxane Monolith
Author(s) -
Lin Qianming,
Hou Xisen,
Ke Chenfeng
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201612440
Subject(s) - ethylene oxide , materials science , monolith , copolymer , self healing hydrogels , rotaxane , polymerization , elastomer , oxide , fabrication , nanotechnology , smart material , molecule , cyclodextrin , chemical engineering , polymer chemistry , chemistry , composite material , polymer , organic chemistry , supramolecular chemistry , catalysis , medicine , alternative medicine , pathology , engineering , metallurgy
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.