期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 3, 页码 3506-3515出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20755
关键词
tough hydrogels; adhesion; zwitterionic polymer; self-healing; strain sensors
资金
- National Natural Science Foundation of China [21574145, 51873224, 21374029]
- Natural Science Foundation of Zhejiang Province [LQ16E030002, LY17E030011]
- Natural Science Foundation of Ningbo [2017A610057, 2016A610255]
It is desired to create skin strain sensors composed of multifunctional conductive hydrogels with excellent toughness and adhesion properties to sustain cyclic loadings during use and facilitate the electrical signal transmission. Herein, we prepared transparent, compliant, and adhesive zwitterionic nanocomposite hydrogels with excellent mechanical properties. The incorporated zwitterionic polymers can form interchain dipole-dipole associations to offer additional physical cross-linking of the network. The hydrogels show a high fracture elongation up to 2000%, a fracture strength up to 0.27 MPa, and a fracture toughness up to 2.45 MJ/m(3). Moreover, the reversible physical interaction imparts the hydrogels with rapid self-healing ability without any stimuli. The hydrogels are adhesive to many surfaces including polyelectrolyte hydrogels, skin, glasses, silicone rubbers, and nitrite rubbers. The presence of abundant zwitterionic groups facilitates ionic conductivity in the hydrogels. The combination of these properties enables the hydrogels to act as strain sensors with high sensitivity (gauge factor = 1.8). The strategy to design the tough, adhesive, self-healable, and conductive hydrogels as skin strain sensors by the zwitterionic nanocomposite hydrogels is promising for practical applications.
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