期刊
COLLOID AND POLYMER SCIENCE
卷 297, 期 6, 页码 821-830出版社
SPRINGER
DOI: 10.1007/s00396-019-04512-7
关键词
PVA; Nanocomposite interpenetrating hydrogel; Toughness; Self-recovery; Draw-induced strengthening
资金
- National Nature Science Foundation of China [21104040, 51473007, 31570575]
It is particularly desirable to fabricate highly tough hydrogels with excellent self-recoverable properties for applications where high stress is required. In this work, we prepared a tough, fast self-recoverable nanocomposite hydrogel by chemical cross-linking of acrylamide (AM) monomers with vinyl-modified silica nanoparticles (VSNPs), combined with physical cross-linking of polyvinyl alcohol (PVA). The uniaxial tensile test showed that the nanocomposite hydrogel has excellent mechanical properties. The maximum elongation at break wasas high as 666%, and the tensile strength wasas high as 1.68MPa. Cyclic loading-unloading tests revealed the excellent self-healing properties of the nanocomposite hydrogel. It is worth noting that the nanocomposite hydrogel exhibitedhigher strength after two loading-unloading cycles, due to the orientation of the PVA when stretched. In addition, the effects of PVA, VSNPs, and AM concentrations, and the number of PVA freeze-thaw cycles and freezing duration on the mechanical properties of the hydrogels were investigated in detail.
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