Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250199, PR China.
Carbohydr Polym. 2018 Apr 15;186:208-216. doi: 10.1016/j.carbpol.2018.01.031. Epub 2018 Jan 11.
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 HO/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.
这项工作报道了一种在室温下通过将 N,N'-亚甲基双丙烯酰胺 (MBA) 与纤维素溶液混合在 NaOH/尿素水溶液中制备基于纤维素的水凝胶的“一步法”。水凝胶是通过 MBA 的双键与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，即刚制备的水凝胶和在去离子水中达到溶胀平衡状态的水凝胶。水凝胶的保水能力高达 330 g HO/g 干水凝胶。随着 MBA 的加入，刚制备的水凝胶表现出更高的机械强度和高透明度（94%）。溶胀平衡状态下的水凝胶具有高达 0.65mm 的大孔结构，并且随着 MBA 用量的不同表现出明显不同的性质。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。
