Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 219, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201800329
Keywords
composite hydrogels; lower critical solution temperature; optical properties; thermoresponsive; upper critical solution temperature
Categories
Funding
- National Natural Science Foundation of China [51673126, 51733005]
- National Science Fund for Distinguished Young Scholars of China [51425305]
- Chengdu Huimin Projects of Science and Technology [2015-HM01-00389-SF]
- Fundamental Research Funds for the Central Universities [YJ201550, 2017SCU04A06]
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A self-healing composite hydrogel with thermoresponsive three-stage optical adjustment (opaque-transparent-translucent) is achieved by combining polyampholyte hydrogel (PAH) with a small amount of poly(N-isopropylacrylamide) (PNIPAM) nanogels. The PAH has an upper critical solution temperature to dominate the initial optical stage of reversible opaque-transparent transition and also offers its self-healing properties via reversible ionic bonds. Meanwhile, the PNIPAM shows a lower critical solution temperature by hydrophilic-hydrophobic phase transition and synergistic clustering of PAH, which controls the subsequent optical stage of reversible transparent-translucent transition. Therefore, the PAH/PNIPAM composite hydrogel shows a reversible three-stage optical modulation by controlling temperature from low (<15 degrees C) to medium (15-30 degrees C) to high (>30 degrees C) via double phase transition behavior of PAH/PNIPAM. Through different analytical methods, the synergistic thermoreposensive effects of PNIPAM nanogels and the bulk PAH are demonstrated. Finally, a prototype of a smart window is designed to demonstrate one of its potential applications.
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