期刊
CELLULOSE
卷 28, 期 3, 页码 1469-1488出版社
SPRINGER
DOI: 10.1007/s10570-020-03606-8
关键词
Shape memory hydrogels; Polyacrylamide; Nanocellulose; Mechanical properties
资金
- National Natural Science Foundation of China [31770609, 31901274]
- Natural Science Foundation of Jiangsu Province for Outstanding Young Scholars [BK20180090]
- Qing Lan Project of Jiangsu Province (2019)
- 333 Project Foundation of Jiangsu Province [BRA2018337]
- 13th China Special Postdoctoral Science Foundation [2020T130303]
- China Postdoctoral Science Foundation [2019M661854]
- Postdoctoral Science Foundation of Jiangsu Province [2019K142]
- Priority Academic Program Development (PAPD)
- Analysis and Test Center of Nanjing Forestry University
A novel nanocomposite hydrogel has been developed by introducing TOCN to enhance mechanical properties and self-recovery rate, and utilizing coordination with Fe3+ for remarkable shape memory properties. The hydrogel exhibits excellent energy dissipation capability, viscoelasticity, and self-recovery rate, with particularly better tensile performance in the 3% TOCN/PAAM-Fe3+ hydrogel.
Shape memory hydrogels attract increasing attention due to their promising applications as intelligent biomaterials for actuators, biomedicine and sensory applications. Nonetheless, the integration of synergistic characteristics providing good mechanical properties and ideal self-recovery rate still remains a challenge. To tackle this, we develop a novel nanocomposite hydrogel by radical polymerization. TEMPO-oxidized cellulose nanofibers (TOCNs) with high strength and ultra-high aspect ratio were introduced to improve the energy dissipation mechanism and enhance the fatigue resistance of polyacrylamide (PAAM) hydrogel. Interestingly, the nanocomposite hydrogel displays unprecedented shape memory properties through coordination with Fe3+. The resulting TOCN/PAAM hydrogel achieves excellent energy dissipation capability (9.68 MJ m(-3) at 60% strain), satisfactory viscoelasticity (51.1 kPa) and good self-recovery rate (about 93.2% after 30 min recovery). In particular, the 3% TOCN/PAAM-Fe3+ hydrogel exhibits better tensile performance. This nanocomposite hydrogel with good shape memory properties and excellent mechanical strength has broad application prospects in soft actuators and sensory research. [GRAPHICS] .
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