ABSTRACT We report the dynamic behavior of diselenide-containing hydrophilic polyurethanes and hydrogels based on diselenide exchange reactions in an aqueous media. Diselenide-containing linear and cross-linked polyurethanes were synthesized via polyaddition reactions using diselenide-containing diol in combination with pyridinium diol that enhances the hydrophilicity of the polymer chains. The obtained linear polyurethanes underwent photo-induced diselenide exchange reactions with small diselenide compounds and degraded to smaller fragments, confirming the dynamicity of the obtained hydrophilic polyurethanes. The prepared hydrogels displayed characteristic large swelling behavior based on the structural reorganization through diselenide exchange either under photo-irradiation at 365 nm or even in the dark at room temperature. The diselenide-containing hydrogels also showed crack-healing behavior under the same exchanging conditions, presenting the utility of diselenide linkages as simple and useful units to offer high dynamicity to hydrogels.

中文翻译：

---

基于动态二硒键的水凝胶的结构重组和裂纹修复性能


摘要：我们报告了基于水介质中二硒化物交换反应的含二硒化物亲水性聚氨酯和水凝胶的动态行为。使用含二硒化物的二醇与吡啶鎓二醇结合通过加聚反应合成了含二硒化物的线性和交联聚氨酯，吡啶二醇增强了聚合物链的亲水性。所得线性聚氨酯与小二硒化物发生光诱导二硒化物交换反应，并降解成更小的碎片，证实了所得亲水性聚氨酯的动态性。所制备的水凝胶在 365 nm 光照射下甚至在室温下的黑暗中表现出基于通过二硒化物交换进行结构重组的特征性大溶胀行为。含二硒化物的水凝胶在相同的交换条件下也表现出裂纹修复行为，表明二硒化物键作为简单而有用的单元可以为水凝胶提供高动态性。