期刊
JOURNAL OF POLYMER SCIENCE
卷 59, 期 10, 页码 904-911出版社
WILEY
DOI: 10.1002/pol.20210070
关键词
fluorescent hydrogels; hydrogen bonds; hydrophobic associations; physical crosslinks; tough hydrogels
资金
- National Natural Science Foundation of China [51773179]
- Natural Science Foundation of Zhejiang Province [LR19E030002]
- Zhejiang University
A fluorescent composite hydrogel with high toughness was prepared by solution casting ethanol solution of poly(hydroxyurethane) (PHU) and poly(stearyl acrylate-co-acrylic acid) (P[SA-co-AAc]) followed by swelling in water. The hydrogel exhibited remarkable mechanical performances and strong fluorescence, making it suitable for applications in flexible electronics, information display, and biomedical devices.
Fluorescent hydrogels have promising applications in biomedical and engineering fields. However, they are usually mechanically weak. Here, we report a fluorescent composite hydrogel with high toughness, which is facilely prepared by solution casting ethanol solution of poly(hydroxyurethane) (PHU) and poly(stearyl acrylate-co-acrylic acid) (P[SA-co-AAc]) followed by swelling the casted film in water. The composite hydrogels with water content of 62-78 wt% possess remarkable mechanical performances, with tensile breaking stress of 0.3-1.1 MPa, breaking strain of 280%-400%, Young's modulus of 0.2-0.7 MPa, and tearing fracture energy of 1250-2630 J/m(2). The high toughness is attributed to the effective energy dissipation of the network with hydrophobic association of SA units and hydrogen bonds between PHU and P(SA-co-AAc) as the physical crosslinks. The intense aggregation of carbamates and the formation of carbamate clusters through intra- and intermolecular hydrogen bonds endow the composite hydrogel with strong fluorescence. These hydrogels with high toughness and strong fluorescence should find applications in flexible electronics, information display, and biomedical devices.
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