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首页> 外文期刊>Advanced Functional Materials >Covalent Poly(2-lsopropenyl-2-Oxazoline) Hydrogels with Ultrahigh Mechanical Strength and Toughness through Secondary Terpyridine Metal-Coordination Crosslinks
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Covalent Poly(2-lsopropenyl-2-Oxazoline) Hydrogels with Ultrahigh Mechanical Strength and Toughness through Secondary Terpyridine Metal-Coordination Crosslinks

机译：通过次级联吡啶金属配位交联具有超高机械强度和韧性的共价聚（2-异丙烯基-2-恶唑啉）水凝胶

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摘要

The present study reports the synthesis of poly(2-isopropenyl-2-oxazoline) (PiPOx) dual-crosslinked hydrogels by both covalent and physical (i.e., metal-ligand coordination) interactions. First, chemical crosslinking of a modified PiPOx polymer containing terpyridine (TPy) unit is achieved by reacting with azelaic acid (non-anedioic acid). Transient crosslinks are subsequently introduced by complexation of the TPy units with different divalent transition metal ions. This strategy provides access to hydrogels with superior mechanical properties compared to the pure covalently crosslinked PiPOx hydrogels. The mechanical properties and water uptake of the hydrogels could be easily controlled by swelling in different aqueous metal ion solutions. PiPOx hydrogels swollen in Zn2+ solution are found to possess ultrahigh compression strength (9 MPa), remarkable toughness (99 MJ m(-3)) and outstanding self-recoverability (98% toughness recovery after swelling for 60 min without external stimuli), which are among the highest reported in literature to date. These remarkable properties are assigned to the thermodynamically stable, but kinetically labile Zn2+-TPy complexes that produce a dynamic network with fewer imperfections and better adaptive properties under mechanical stress compared to those with other metal ions.
机译：本研究报告了通过共价和物理（即金属-配体配位）相互作用合成聚（2-异丙烯基-2-恶唑啉）（PiPOx）双交联水凝胶。首先，通过与壬二酸（非壬二酸）反应，实现了含有三联吡啶（TPy）单元的改性PiPOx聚合物的化学交联。随后通过将TPy单元与不同的二价过渡金属离子络合来引入瞬态交联键。与纯共价交联的PiPOx水凝胶相比，该策略可提供具有优异机械性能的水凝胶。通过在不同的金属离子水溶液中溶胀，可以容易地控制水凝胶的机械性能和吸水率。发现在Zn2 +溶液中溶胀的PiPOx水凝胶具有超高的抗压强度（9 MPa），出色的韧性（99 MJ m（-3））和出色的自恢复性（在无外部刺激的情况下溶胀60分钟后恢复了98％的韧性）。是迄今为止文献报道数量最高的。这些非凡的特性归因于热力学稳定但动力学不稳定的Zn2 + -TPy络合物，与其他金属离子相比，该络合物产生的动态网络在机械应力下具有更少的缺陷和更好的适应性。

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