Abstract
It remains challenging to develop hydrogels with comprehensive mechanical properties including ultrahigh strength, toughness and rapid self-recovery. Herein, dual physical crosslinking strategy was used to develop novel nanocomposite hydrogels reinforced by poly(N-vinylpyrrolidone) grafted cellulose nanocrystal (CNC-g-PVP). The hydrogels were fabricated via in situ copolymerization of acrylic acid (AA) and acrylamide (AM) in presence of CNC-g-PVP and subsequent introduction of Fe3+ ions. CNC-g-PVP induced the first crosslinking through strong cooperative hydrogen bonds existing between PVP chains grafted onto CNCs and amide groups from P(AM-co-AA) chains. Fe3+ triggered the second crosslinking by forming coordination bonds with –COO− groups. The cooperative hydrogen bonds enhanced the interfacial compatibility between CNC-g-PVP nanofillers and hydrogel matrix, and served as fast recoverable sacrificial bonds. As a result, the hydrogels exhibited high tensile strength (1.89–2.51 MPa), remarkable toughness (6.01–6.81 MJ/m3), rapid self-recovery (83.4–97.8% recovery of hysteresis loop within 5 min) and favourable fatigue resistance.
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This study was funded by the Natural Science Foundation of Jiangsu Province (Grant No. BK20140967).
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Li, B., Han, Y., Zhang, Y. et al. Dual physically crosslinked nanocomposite hydrogels reinforced by poly(N-vinylpyrrolidone) grafted cellulose nanocrystal with high strength, toughness, and rapid self-recovery. Cellulose 27, 9913–9925 (2020). https://doi.org/10.1007/s10570-020-03487-x
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DOI: https://doi.org/10.1007/s10570-020-03487-x