Graduate School of Environmental Engineering for Symbiosis, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo, 192-8577, Japan.
SUN Technologies, 2196-110, Hirai, Hinode-machi, Nishitamagun, Tokyo, 190-0182, Japan.
Carbohydr Res. 2020 Aug;494:108054. doi: 10.1016/j.carres.2020.108054. Epub 2020 Jun 7.
In this study, we developed an easy process for the production of cellulose hydrogels over a wide concentration range by using an ionic liquid/DMSO mixed solution that can easily be recycled at room temperature and has low environmental impact. Cellulose was completely dissolved at 6 to 20 wt% with respect to the [BMIm][OAc]/DMSO mixed solution at room temperature and ambient pressure. Placing the cellulose solution in a mold and immersing it in deionized water caused solvent replacement of the [BMIm][OAc]/DMSO mixed solution with deionized water, making it easy to obtain a cellulose hydrogel without using a crosslinking agent. Approximately 80% of the ionic liquid could be reused by constructing a system that recovers the ionic liquid discharged from the cellulose solution during solvent replacement. The pore size, water content and mechanical strength of the cellulose hydrogel strongly depended on the concentration of the cellulose solution prepared using the [BMIm][OAc]/DMSO mixture. However, the crystallinity and thermal stability did not show a concentration dependence.
在这项研究中，我们开发了一种在很宽的浓度范围内生产纤维素水凝胶的简单方法，使用室温下可轻易回收且环境影响低的离子液体/DMSO 混合溶液。纤维素在室温常压下可完全溶解于 6 至 20wt%的[BMIm][OAc]/DMSO 混合溶液中。将纤维素溶液置于模具中并浸入去离子水中，会使[BMIm][OAc]/DMSO 混合溶液与去离子水发生溶剂置换，无需使用交联剂即可轻松获得纤维素水凝胶。通过构建一个从纤维素溶液中回收在溶剂置换过程中排出的离子液体的系统，可以重复使用约 80%的离子液体。纤维素水凝胶的孔径、含水量和机械强度强烈依赖于使用[BMIm][OAc]/DMSO 混合物制备的纤维素溶液的浓度。然而，结晶度和热稳定性没有表现出浓度依赖性。
