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Responsive Polypseudorotaxane Hydrogels Triggered by a Compatible Stimulus of CO 2
Author(s) -
Yan Diwei,
Liu Sa,
Jia YongGuang,
Mo Lina,
Qi Dawei,
Wang Jin,
Chen Yunhua,
Ren Li
Publication year - 2019
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201900071
Subject(s) - self healing hydrogels , isothermal titration calorimetry , ethylene glycol , supramolecular chemistry , peg ratio , chemistry , chemical engineering , materials science , polymer chemistry , molecule , nanotechnology , organic chemistry , finance , engineering , economics
Realizing the reversible transformation of the supramolecular hydrogels is essential for their application as smart materials. The reversible sol‐gel transition of the polypseudorotaxane (PPR) hydrogels is achieved through adding a CO 2 ‐switchable guest molecule into the PPR hydrogel of poly(ethylene glycol) (PEG) and α‐cyclodextrins (α‐CDs). Alternating treatments with CO 2 and heating drive such reversible transition due to the competitive complexation as evidenced by 2D NOESY 1 H NMR and isothermal titration calorimetry as well as X‐ray diffraction. The present work describes a straightforward way to obtain switchable PPR hydrogels triggered by a compatible stimulus of CO 2 . These stimuli‐responsive PPR hydrogels have potential applications as biomaterials.