This work reports a “one-step” approach to make cellulose-based hydrogels in NaOH/urea aqueous solution via mixing N,N′-methylene bisacrylamide (MBA) with cellulose solution at room temperature. The hydrogels were revealed to be formed by an addition reaction between the double bonds of MBA and the hydroxyl groups of cellulose. Two states of hydrogels, i.e. the freshly prepared hydrogels and the hydrogels at swelling equilibrium state in deionized water, were prepared. Water retention of the hydrogels can reach up to 330 g H₂O/g dry hydrogel. The freshly prepared hydrogels showed increased mechanical strength and high transparency (94%) with the addition of MBA. The hydrogels at swelling equilibrium state displayed macroporous structures with the pore diameter up to 0.65 mm and showed significantly varied properties with various amount of MBA. The obtained hydrogel could be used as a good blank template for the functionalization of cellulose-based hydrogel.

这项工作报告了一种“一步法”的方法，通过在室温下将N，N'-亚甲基双丙烯酰胺（MBA）与纤维素溶液混合，在NaOH /尿素水溶液中制备纤维素基水凝胶。揭示水凝胶是由MBA的双键和纤维素的羟基之间的加成反应形成的。制备了两种状态的水凝胶，即新鲜制备的水凝胶和在去离子水中处于溶胀平衡状态的水凝胶。水凝胶的保水量可达330 g H ₂O / g干燥水凝胶。新鲜制备的水凝胶通过添加MBA表现出更高的机械强度和较高的透明度（94％）。处于溶胀平衡状态的水凝胶显示出大孔结构，其孔径高达0.65 mm，并且在各种MBA量下表现出明显不同的性能。所得水凝胶可用作纤维素基水凝胶功能化的良好空白模板。