In this work, a flexible and polymerizable polyurethane‐urea (PUU) nanoparticle is used for the first time to prepare hydrogels showing highly stretchable, compressible, and resilient properties in their equilibrium swelling state. The PUU nanoparticles are prepared by reported interfacial polycondensation of O/W nanoemulsions followed by surface modification with acrylate groups. The hydrogels are prepared by simple free‐radical copolymerization of acrylamide and the polymerizable PUU nanoparticles. These PUU nanoparticles are expected to act as polyfunctional nanocrosslinkers and elastic junctions of the hydrogel’s network. The obtained hydrogels show high water containing character (94–97 wt%) in their equilibrium swelling state. The equilibrium swelling hydrogels can still be stretched and compressed up to 430–1170% and 95%, respectively, without fracture. Furthermore, cyclic tensile tests with a maximum strain of 500% or 700% show that the resilience of these equilibrium swelling hydrogels is as high as 95–97%. This work provides a new strategy and some new insights into the fabrication of fully swelling hydrogels with both extraordinary ductility and resilience, which is of critical importance for many of their practical applications.

中文翻译：

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具有弹性纳米结的高度可拉伸，可压缩，弹性和平衡膨胀的水凝胶

在这项工作中，首次使用了可聚合的柔性聚氨酯-尿素（PUU）纳米颗粒，以制备在其平衡溶胀状态下具有高度可拉伸，可压缩和有弹性的水凝胶。通过报告的O / W纳米乳液的界面缩聚，然后用丙烯酸酯基团进行表面改性，可以制备PUU纳米颗粒。通过丙烯酰胺和可聚合的PUU纳米粒子的简单自由基共聚反应制备水凝胶。这些PUU纳米颗粒有望充当水凝胶网络的多功能纳米交联剂和弹性连接。所获得的水凝胶在其平衡溶胀状态下显示出较高的含水特性（94–97 wt％）。平衡溶胀水凝胶仍可分别拉伸和压缩至430-1170％和95％，没有骨折。此外，最大拉伸应变为500％或700％的循环拉伸试验表明，这些平衡溶胀水凝胶的回弹性高达95-97％。这项工作为制造具有出色延展性和回弹力的完全溶胀的水凝胶提供了新的策略和新见识，这对于许多实际应用至关重要。