Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 1, Issue 10, Pages 2027-2030Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7qm00170c
Keywords
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Funding
- General Research Fund (GRF) [516111, 516212, 515813]
- Research Grants Council (RGC) of Hong Kong [500810]
- Development of Environmental Friendly and Self-Adaptive Breathable Polyurethane Film [GHX/001/16GD]
- Science and Technology Planning Project of Guangdong Province, China [2016A050503013]
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Developing materials with self-adaptive water vapor permeability is fueled with industrial demands. Polymers have enabled such a behavior with thermal-responsive water vapor permeability reported in the literature, but little work is reported on the moisture-sensitive water vapor permeability which is even more important for many applications, such as clothing comfort, since sweating can be enormous when actively exercising in the cold. In this paper, a polymer inspired by a leaf guard-cell and designed by introducing supramolecular hydrogen-bonding switches and moisture-sensitive self-adaptive water vapor permeability has been achieved. It is suggested that hydrogen bonding can become a moisture-responsive switch when its bonding energy is smaller than the energy between the water molecule and the switch itself, but much bigger than that of water.
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