Self-healable, tough and highly stretchable ionic nanocomposite physical hydrogels.
Self-healable, tough and highly stretchable ionic nanocomposite physical hydrogels.
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DOI：
10.1039/c5sm00493d
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发表时间：
2015-05
期刊：
影响因子：
3.4
通讯作者：
M. Zhong;Xiao-ying Liu;Fu-Kuan Shi;Li-qin Zhang;Xi-Ping Wang;A. Cheetham;H. Cui;Xu-Ming Xie
中科院分区：
文献类型：
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作者：
M. Zhong;Xiao-ying Liu;Fu-Kuan Shi;Li-qin Zhang;Xi-Ping Wang;A. Cheetham;H. Cui;Xu-Ming Xie
我们提出了一种简单的策略来合成自愈、坚韧和高度可伸展的水凝胶。我们创建离子交联水凝胶的设计原理是在乙烯基杂化二氧化硅纳米颗粒(VSNPs)的表面接枝丙烯酸单体，以用于聚丙烯酸(PAA)的生长，得到的VSNP-PAA纳米棒可以用作凝胶剂。通过氢键和铁离子在凝胶剂的聚丙烯酸酯聚合物链之间的离子相互作用进行物理交联，得到了具有优异和平衡的力学性能(拉伸强度860kPA，断裂伸长率∼2300%)和自修复能力(拉伸强度∼560kPA，断裂伸长率∼1800%)的离子纳米复合物理水凝胶。韧性和延伸性来自聚合物链之间的可逆交联相互作用，这些相互作用有助于通过应力(变形)引发的动态过程来分散能量。这些独特的性质将使这些水凝胶材料得到更广泛的应用，特别是在组织工程中。
We present a facile strategy to synthesize self-healable tough and highly stretchable hydrogels. Our design rationale for the creation of ionic cross-linked hydrogels is to graft an acrylic acid monomer on the surface of vinyl hybrid silica nanoparticles (VSNPs) for the growth of poly(acrylic) acid (PAA), and the obtained VSNP-PAA nanobrush can be used as a gelator. Physical cross-linking through hydrogen bonding and ferric ion-mediated ionic interactions between PAA polymer chains of the gelators yielded ionic nanocomposite physical hydrogels with excellent and balanced mechanical properties (tensile strength 860 kPa, elongation at break ∼2300%), and the ability to self-repair (tensile strength ∼560 kPa, elongation at break ∼1800%). The toughness and stretchability arise from the reversible cross-linking interactions between the polymer chains that help dissipate energy through stress (deformation) triggered dynamic processes. These unique properties will enable greater application of these hydrogel materials, especially in tissue engineering.