Allyl-substituted alginate (Alg) underwent gelation with N-isopropylacrylamide (NIPAM) monomers via UV-mediated radical reactions, resulting in a multi-responsive double-network hydrogel. The amount of NIPAM available for crosslinking affected several properties of the resulting Alg-NIPAM hydrogels. As more NIPAM was incorporated, the volume phase transition temperature (VPTT) and swelling properties of the Alg-NIPAM hydrogels decreased. Metal-ion addition caused increased crosslinking of the Alg-NIPAM hydrogels, allowing shape-memory of the materials due to their dual responsiveness to temperature and metal ions. Additional crosslinking caused the hydrogels to become stiffer, showing the ability to regulate the mechanical properties of the hydrogels. As a proof-of-concept, reversible shape changes under temperature and ionic cycling were demonstrated.

烯丙基取代的藻酸盐（Alg）与N凝胶化-异丙基丙烯酰胺（NIPAM）单体通过紫外线介导的自由基反应，产生了多响应双网络水凝胶。可用于交联的NIPAM的量影响了所得Alg-NIPAM水凝胶的几种性能。随着更多NIPAM的加入，Alg-NIPAM水凝胶的体积相变温度（VPTT）和溶胀性能降低。金属离子的添加​​导致Alg-NIPAM水凝胶的交联增加，由于其对温度和金属离子的双重响应，从而使材料具有形状记忆。额外的交联使水凝胶变硬，表现出调节水凝胶机械性能的能力。作为概念验证，证明了在温度和离子循环作用下可逆的形状变化。