Dual Physically Cross-Linked Nanocomposite Hydrogels Reinforced by Tunicate Cellulose Nanocrystals with High Toughness and Good Self-Recoverability.
Dual Physically Cross-Linked Nanocomposite Hydrogels Reinforced by Tunicate Cellulose Nanocrystals with High Toughness and Good Self-Recoverability.
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DOI：
10.1021/acsami.7b06219
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发表时间：
2017-07
影响因子：
9.5
通讯作者：
Tiantian Zhang;Tao Zuo;Danning Hu;Chunyu Chang
中科院分区：
文献类型：
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作者：
Tiantian Zhang;Tao Zuo;Danning Hu;Chunyu Chang
由于水凝胶力学性能弱，限制了其在生物医学和工业领域的应用。在此，我们报道了一个由季铵化束状纤维素纳米晶体（Q-TCNCs）和Fe3+依次交联的聚丙烯酸-共丙烯酰胺（PAAAM）纳米复合网络。在纳米复合水凝胶中，Q-TCNCs作为界面相容性增强剂和交联剂形成松散交联，而PAAAM的Fe3+和- coo -离子配位形成紧密交联。双交联水凝胶（D-Gel）的韧性是单交联水凝胶（m-Gel）的340倍，是PAAAM水凝胶的10倍。此外，在FeCl3水溶液中处理拉伸后的样品后，纳米复合水凝胶表现出良好的自恢复能力。这项工作为构建纤维素纳米晶体增强的坚韧纳米复合水凝胶提供了一种通用策略。
The weak mechanical properties of hydrogels usually limited their application in biomedical and industrial fields. Herein, we reported a nanocomposite network of poly(acrylic acid-co-acrylamide) (PAAAM) sequentially cross-linked by quaternized tunicate cellulose nanocrystals (Q-TCNCs) and Fe3+. Q-TCNCs acted as both interfacial compatible reinforcements and cross-linkers in the nanocomposite hydrogels to form loose cross-linking, whereas compact cross-linking was built by ionic coordination between Fe3+ and -COO- of PAAAM. The toughness of dual cross-linked hydrogel (D-Gel) was 340 times that of mono-cross-linked hydrogel (m-Gel), which was 10 times that of PAAAM hydrogel. Moreover, the nanocomposite hydrogels exhibited excellent self-recoverability after treating the stretched samples in FeCl3 aqueous solution. This work provided a universal strategy for construction of tough nanocomposite hydrogel reinforced with cellulose nanocrystals.