酸处理与尿素联合使用在纤维素水凝胶形成中的作用。
Role of acid treatment combined with the use of urea in forming cellulose hydrogel.
机构信息
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; United Lab of Plant Resources Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; United Lab of Plant Resources Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
出版信息
Carbohydr Polym. 2019 Nov 1;223:115059. doi: 10.1016/j.carbpol.2019.115059. Epub 2019 Jul 5.
Fast-swelling, porous cellulose hydrogels (PCHs) were generated via simple acid treatment of cellulose hydrogel prepared in NaOH/urea medium. Structural characteristics of the PCHs were investigated by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Swelling behavior was assessed by measuring the swelling kinetics in deionized water. Mechanical properties were also examined. The results showed that acid treated PCHs had many more micropores, mesopores and macropores, and PCH-6% displayed a high specific surface area of 33.98 m/g. However, cellulose hydrogel without acid treatment had a low specific surface area (2.499 m/g). Mechanical property of hydrogel was found to be slightly deteriorated with the improvement of porous structure. The equilibrium swelling rate of PCHs had drastically improvement after acid treatment. This porous cellulose hydrogel skeleton presents a wide range of possibilities for the further development of fast swelling cellulose-based functional hydrogel.
快速溶胀多孔纤维素水凝胶（PCHs）是通过简单的酸处理在 NaOH/尿素介质中制备的纤维素水凝胶得到的。通过扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）研究了 PCHs 的结构特征。通过在去离子水中测量溶胀动力学来评估溶胀行为。还研究了机械性能。结果表明，酸处理的 PCHs 具有更多的微孔、中孔和大孔，而 PCH-6% 显示出 33.98 m/g 的高比表面积。然而，未经酸处理的纤维素水凝胶的比表面积较低（2.499 m/g）。随着多孔结构的改善，水凝胶的机械性能略有恶化。酸处理后 PCHs 的平衡溶胀速率有了显著提高。这种多孔纤维素水凝胶骨架为进一步开发快速溶胀的基于纤维素的功能性水凝胶提供了广泛的可能性。
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