纤维素/海藻酸钙共混纤维的制备及其性能

针对纤维素纤维易燃烧的问题,首先以离子液体1-烯丙基-3-甲基咪唑氯盐(AMIM]Cl)为溶剂共溶解纤维素与海藻酸,然后以氯化钙溶液为凝固浴,采用干喷湿法纺丝制备了纤维素/海藻酸钙共混纤维。研究了纤维素/海藻酸钙组分比对共混纤维结构和性能的影响。结果表明:纤维素/海藻酸钙共混纤维结构致密,二者之间存在氢键相互作用;虽然海藻酸钙的存在使共混纤维的力学性能降低,但当海藻酸钙质量分数为30%时,共混纤维的断裂强度为123 MPa,离火自熄时间仅为1.1 s,表现出优良的离火自熄特性;纤维素/海藻酸钙共混纤维的吸湿平衡回潮率为7.33%~7.75%,具有类似再生纤维素纤维的优良吸湿性能与服用性能。

Preparation and properties of cellulose/calcium alginate blend fiber

In order to reduce the flammability of cellulose fibers, ionic liquid 1-allyl-3-methylimidazole chloride (AMIM]Cl) was used as co-solvent for cellulose and alginic acid. Then, the cellulose/calcium alginate blend fiber was prepared with calcium chloride solution as the coagulation bath by dry-jet wet spinning. The effect of cellulose/calcium alginate blend ratio on the structure and properties of the fibers were studied. The results show that the cross-section of the blend fibers is dense, and the hydrogen bond interactions exist between cellulose and calcium alginate molecules. Despite the fact of the mechanical strength of the blend fibers decreases with the increase of calcium alginate content, the tensile strength reaches 123 MPa when the content of calcium alginate is 30%, and the self-extinguishing time from fire of this fiber is only 1.1 s, indicating excellent self-extinguishing property. In addition, the moisture regain of cellulose/calcium alginate blend fibers is 7.33%-7.75%, representing good hygrophilic property and wearability for regenerated cellulose fibers.