State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
Carbohydr Polym. 2013 Sep 12;97(2):429-35. doi: 10.1016/j.carbpol.2013.04.088. Epub 2013 May 4.
Superabsorbents based on carboxylated cellulose nanofibrils (CCNFs) and carboxymethyl cellulose-g-poly(acrylic acid-co-acrylamide) were synthesized. A series of experiments were performed to evaluate the influence of factors such as CCNFs amount, solution pH, temperature, salt solution type and concentration on the swelling behaviors of the hydrogels. The water uptake of the hydrogels strongly depended on the CCNF content, the swelling capacity in distilled water increased dramatically from 245.8 to 458.7 g/g with the addition of CCNFs up to 2.5 wt%. Furthermore, the incorporation of CCNFs improved salt resistance properties of the hydrogels with slower deswelling rate and higher water retention capacity at deswelling equilibrium. Besides, the CCNF nanocomposite hydrogels presented better responsive behavior in relation to pH presence and showed an increase in water retention capacity at various temperatures. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were employed to examine the structure and morphologies of the prepared superabsorbent hydrogels.
基于羧基化纤维素纳米纤维（CCNFs）和羧甲基纤维素-g-聚（丙烯酸-co-丙烯酰胺）合成了超吸水性材料。进行了一系列实验来评估诸如 CCNFs 用量、溶液 pH 值、温度、盐溶液类型和浓度等因素对水凝胶溶胀行为的影响。水凝胶的吸水率强烈依赖于 CCNF 的含量，在添加 CCNFs 至 2.5wt%时，在蒸馏水中的溶胀能力从 245.8 显著增加到 458.7g/g。此外，CCNF 的加入提高了水凝胶的耐盐性，具有较慢的脱水率和在脱水平衡时更高的保水能力。此外，CCNF 纳米复合水凝胶在 pH 值存在的情况下表现出更好的响应行为，并在各种温度下显示出保水能力的增加。傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）用于检查所制备的超吸水性水凝胶的结构和形态。
