当前位置：
X-MOL 学术
›
ACS Appl. Polym. Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Eco-friendly Carboxymethyl Cellulose Nanofiber Hydrogels Prepared via Freeze Cross-Linking and Their Applications
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-10-29 , DOI: 10.1021/acsapm.0c00831 Yurina Sekine 1, 2 , Takuya Nankawa 2 , Shunji Yunoki 3 , Tsuyoshi Sugita 2 , Hiroshi Nakagawa 1 , Teppei Yamada 4
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-10-29 , DOI: 10.1021/acsapm.0c00831 Yurina Sekine 1, 2 , Takuya Nankawa 2 , Shunji Yunoki 3 , Tsuyoshi Sugita 2 , Hiroshi Nakagawa 1 , Teppei Yamada 4
Affiliation
|
We developed a cross-linking method using freeze concentration and used it to synthesize a carboxymethyl cellulose nanofiber (CMCF) hydrogel with high water content (>94%), high compressive strength (>80 MPa), and high compressive recoverability. The hydrogels were prepared by adding an aqueous solution of citric acid (CA) to a frozen CMCF sol and then thawing the sol. The reaction between the freeze-concentrated CMCF and CA created a rigid porous structure with a pore diameter of approximately 80 μm, which resembled the ice crystal structure. The stress–strain curves of the hydrogel during repeated compression up to 80% strain were similar over three cycles, which indicated that their cross-linked structure had high stability to compressive stress. Without the freeze cross-linking method, the complex of the CMCF sol and CA produced hydrogels, which easily collapsed under compressive stress. Bentonite was immobilized on a CMCF hydrogel by adding bentonite to the CMCF sol before freeze cross-linking. The CMCF–bentonite hydrogel showed high adsorptivity for chemical dyes, and the equilibrium sorption capacities for rhodamine B, basic blue 7, methylene blue, and malachite green were 353, 370, 207, and 234 mg g–1, respectively. The physically cross-linked CMCF hydrogels are nontoxic, metal-free, and simple to prepare, and thus, they may be useful as sustainable materials in various fields.
中文翻译：
冷冻交联法制备的生态型羧甲基纤维素纳米纤维水凝胶及其应用
我们开发了一种使用冷冻浓缩的交联方法，并用它来合成具有高水含量（> 94％），高抗压强度（> 80 MPa）和高压缩可恢复性的羧甲基纤维素纳米纤维（CMCF）水凝胶。通过将柠檬酸（CA）的水溶液添加到冷冻的CMCF溶胶中，然后解冻该溶胶来制备水凝胶。冷冻浓缩的CMCF和CA之间的反应产生了具有约80μm的孔径的刚性多孔结构，其类似于冰晶结构。水凝胶在反复压缩直至80％应变期间的应力-应变曲线在三个循环中相似，这表明它们的交联结构对压缩应力具有很高的稳定性。如果没有冻结交联方法，CMCF溶胶和CA的复合物产生了水凝胶，这些水凝胶在压缩应力下很容易塌陷。通过在膨润土交联之前将膨润土添加到CMCF溶胶中，将膨润土固定在CMCF水凝胶上。CMCF-膨润土水凝胶对化学染料具有高吸附性，若丹明B，碱性蓝7，亚甲基蓝和孔雀石绿的平衡吸附容量分别为353、370、207和234 mg g分别为–1。物理交联的CMCF水凝胶无毒，无金属且易于制备，因此，它们可用作各种领域的可持续材料。
更新日期：2020-12-11
中文翻译：
冷冻交联法制备的生态型羧甲基纤维素纳米纤维水凝胶及其应用
我们开发了一种使用冷冻浓缩的交联方法，并用它来合成具有高水含量（> 94％），高抗压强度（> 80 MPa）和高压缩可恢复性的羧甲基纤维素纳米纤维（CMCF）水凝胶。通过将柠檬酸（CA）的水溶液添加到冷冻的CMCF溶胶中，然后解冻该溶胶来制备水凝胶。冷冻浓缩的CMCF和CA之间的反应产生了具有约80μm的孔径的刚性多孔结构，其类似于冰晶结构。水凝胶在反复压缩直至80％应变期间的应力-应变曲线在三个循环中相似，这表明它们的交联结构对压缩应力具有很高的稳定性。如果没有冻结交联方法，CMCF溶胶和CA的复合物产生了水凝胶，这些水凝胶在压缩应力下很容易塌陷。通过在膨润土交联之前将膨润土添加到CMCF溶胶中，将膨润土固定在CMCF水凝胶上。CMCF-膨润土水凝胶对化学染料具有高吸附性，若丹明B，碱性蓝7，亚甲基蓝和孔雀石绿的平衡吸附容量分别为353、370、207和234 mg g分别为–1。物理交联的CMCF水凝胶无毒，无金属且易于制备，因此，它们可用作各种领域的可持续材料。
京公网安备 11010802027423号