Abstract Poly(vinyl alcohol) (PVA)-polypeptide double-network hydrogels with various ionic liquid (IL)-based polypeptides were prepared by a freezing/thawing method. Tensile tests revealed that the stiffness and toughness of the PVA hydrogels were significantly improved (e.g., 6.3 times the Young’s modulus and 5.8 times the work of extension) by incorporation of IL-based polypeptides. An optimized mechanical property was achieved by incorporation of α-helical imidazolium-based polypeptides at x = 0.03. Rheological tests revealed a thermally induced transition at 51.4–58.1 °C for the double network PVA/PPLG-ImBF4-x-67 (x = 0.01, 0.02, 0.03) hydrogels due to the rupture of the electrostatic interactions. Field emission scanning electron microscopy (FESEM) and wide-angle X-ray diffraction (WAXD) results suggested that the strong and tough double-network hydrogel was constructed by PVA crystallites and ionic bonds of IL-based polypeptide as the double physical cross-linkers.

中文翻译：

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强韧聚（乙烯醇）-多肽双网络水凝胶的制备及力学性能

摘要 采用冻融法制备了含有多种离子液体（IL）基多肽的聚乙烯醇（PVA）-多肽双网络水凝胶。拉伸试验表明，通过掺入基于 IL 的多肽，PVA 水凝胶的刚度和韧性得到显着改善（例如，杨氏模量的 6.3 倍和延伸功的 5.8 倍）。通过在 x = 0.03 处掺入基于 α-螺旋咪唑鎓的多肽，实现了优化的机械性能。流变学测试表明，由于静电相互作用的破裂，双网络 PVA/PPLG-ImBF4-x-67 (x = 0.01, 0.02, 0.03) 水凝胶在 51.4–58.1 °C 发生热诱导转变。