<br>使用有机混凝剂和交联剂研究具有不同功能的湿纺海藻酸钠聚甘露糖醛酸酯纤维的凝结过程,Materials Today Chemistry

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使用有机混凝剂和交联剂研究具有不同功能的湿纺海藻酸钠聚甘露糖醛酸酯纤维的凝结过程
Materials Today Chemistry ( IF 6.7 ) Pub Date : 2021-09-28 , DOI: 10.1016/j.mtchem.2021.100580
T.H. Aneem ₁ , S.Y. Wong ₂ , H. Afrin ₃ , M. Nurunnabi _{3,

4} , X. Li ₂ , M.T. Arafat ₁

Affiliation

由甘露糖醛酸嵌段组成的海藻酸盐纤维是通过不同的有机混凝剂和交联剂通过湿法纺丝工艺制造的。作为交联剂，使用离子（Ca2+、Ba2+ 和 Al3+）和共价（柠檬酸），并选择二甲基亚砜（DMSO）、二甲基甲酰胺（DMF）和四氢呋喃（THF）作为凝结剂。纤维特性取决于交联剂的离子大小、化合价和化学结构。在使用的交联剂中，Al3+ 是最小的离子，很容易在聚合物溶液内部扩散，并与三个甘露糖醛酸链形成金属羧酸盐配位。然而，Ca2+ 和 Ba2+ 与它相比都非常大，在形成链间金属羧酸键后，聚合物链位于 Ca2+ 和 Ba2+ 的平行位置约为 48°。柠檬酸与甘露糖醛酸链的羟基发生酯化反应。混凝剂稳定了交联过程并与聚合物链形成氢键。根据交联剂和凝结剂的不同，纤维直径范围为 217 μm 至 830 μm，拉伸模量范围为 88 MPa 至 2 MPa。Ca2+ 然后是 Ba2+ 离子作为交联剂更有效，因为它们产生的纤维具有优异的机械性能，其次是柠檬酸和 Al3+。对于除柠檬酸以外的所有交联剂，当 DMSO 用作混凝剂时，拉伸模量最高。这表明 DMSO 在凝血过程中更好地稳定了交联过程。在磷酸盐缓冲盐水（PBS）中，只有 Ba2+ 交联纤维能够保持其原始结构 24 h，并且由混凝剂 DMSO 形成的纤维由于其结构致密而膨胀最小。它在 6 周内减轻的体重百分比也最少。样品的热性能也不同，因为 Ba2+ 和 Ca2+ 交联样品比其他样品更耐高温。3-（4,5-二甲基噻唑-2-基）-2,5-二苯基四唑溴化物（MTT）测定说明了所有人造纤维的非细胞毒性。

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Investigation of coagulation process of wet-spun sodium alginate polymannuronate fibers with varied functionality using organic coagulants and cross-linkers

Alginate fibers composed of mannuronate blocks were manufactured via a wet spinning process by varying organic coagulants and cross-linkers. As cross-linkers, both ionic (Ca2+, Ba2+, and Al3+) and covalent (citric acid) were used, and as coagulants, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), and tetrahydrofuran (THF) were selected. Fiber properties depended on the ionic size, valence, and chemical structure of the cross-linkers. Among the used cross-linkers, Al3+ being the smallest ion, could diffuse inside the polymer solution easily and form metal-carboxylate coordination with three mannuronate chains. However, Ca2+ and Ba2+ both were very large compared to it, and polymer chains were positioned at about 48° for Ca2+ and in a parallel manner for Ba2+ after forming inter and intrachain metal-carboxylate bonds. Citric acid underwent an esterification reaction with the hydroxyl groups of mannuronate chains. Coagulants stabilized the cross-linking process and formed hydrogen bonds with the polymer chains. Depending on the cross-linkers and coagulants, the fiber diameter ranged from 217 μm to 830 μm and tensile modulus ranged from 88 MPa to 2 MPa. Ca2+, and then Ba2+ ions were more effective as cross-linkers since they produced fibers with superior mechanical properties followed by citric acid and Al3+. For all cross-linkers except citric acid, when DMSO was used as a coagulant, the tensile modulus was the highest. This indicates that DMSO better stabilized the cross-linking process during coagulation. In phosphate buffer saline (PBS), only Ba2+ cross-linked fibers could retain their original structure for 24 h, and fiber formed with coagulant DMSO swelled the least because of its compact structure. It also lost the least percentage of weight during 6 weeks. Thermal properties of the samples were also different as Ba2+ and Ca2+ cross-linked samples were more resistive to high temperature than other samples. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay illustrated the non-cytotoxicity of all the manufactured fibers.

更新日期：2021-09-28

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