Abstract
Double-network (DN) hydrogel which possesses many superior performances such as excellent toughness, viscoelasticity and self-healing ability has become promising biomaterials. However, lack of thermal conductivity and moderate adhesiveness has greatly limited their application as load-bearing cartilage substitutes. Boron nitride itself has good rigidity and thermal conductivity but poor water solubility. Hydroxylated boron nitride nanosheets (OH-BNNSs) which have been previously reported have good water solubility (~ 0.6 mg/mL) and to obtain a homogeneous and stable dispersion. In this work, we introduced OH-BNNS into DN hydrogel to obtain high thermal conductivity and toughness hydrogel. The DN hydrogel is a class of physically double-network hydrogel with hydrophobic association polyacrylamide (PAM) and partly crystalline polyvinyl alcohol (PVA). Impressively, the obtained PVA/PAM/BNNS composite hydrogel possesses super-flexibility, high toughness, good thermal conductivity, appropriate tissue adhesiveness and stimuli-free self-healing ability. Therefore, the composite hydrogel overcomes the poor mechanical strength and locally overheating issues as cartilage substitutes and may also become alternatives for antipyretic pastes.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Grants 51773124, 51403132), Sichuan Science and Technology Program China (Grants 2016GZ0300, 2018GZ0322), Innovation Team Program of Science and Technology Department of Sichuan Province (Grant 2014TD0002), Cooperation strategic projects of Luzhou governments and Sichuan University (Grant 2015CDLZ-G13) and the Fundamental Research Funds for the Central Universities (Grant 2012017yjsy184).
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Xing, L., Hu, C., Zhang, Y. et al. A mechanically robust double-network hydrogel with high thermal responses via doping hydroxylated boron nitride nanosheets. J Mater Sci 54, 3368–3382 (2019). https://doi.org/10.1007/s10853-018-3037-2
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DOI: https://doi.org/10.1007/s10853-018-3037-2