凝固浴组分对纤维素纤维结构和力学性能的影响

采用新型碱复合溶剂NaOH／j琉脲／尿素水溶液对纤维素进行溶解，并采用H2S04／Na2SO4溶液作为凝固浴，对纤维素溶液进行湿法纺丝，获得纤维素纤维。通过改变凝固浴组分，研究纤维素纤维结构和性能的变化，获得更好的纺丝条件。研究表明，当H2S04质量分数为8％～10％，Na2SO4质量分数6％～12％时，纺丝过程稳定，纤维素纤维的力学性能较好且相对稳定。纤维素纤维的断裂强度最大值可达2．06cN／dtex，纤维素纤维横截面均呈近圆形结构，且无明显的皮芯结构，同时纤维素纤维具有纤维素II的结晶特征，凝固浴组分变化对纤维素纤维的结晶度和取向因子影响不大。

Effects of Coagulation Components on Structures and Properties of Cellulose Fibers from Cellulose Doped in NaOH/Thiourea/Urea Aqueous Solution

The cellulose fiber was prepared by wet-spinning from NaOH/thiourea/urea aqueous solution, while H2SO4/Na2SO4 aqueous solution was used as the coagulation. The effects of coagulation components on the structure, morphology, mechanical properties and thermal properties of the prepared fiber were investigated by X-ray diffraction （XRD）, scanning electron microscope （SEM）, tensile tester and TGA, respectively. The process of spinning was stable and properties of prepared fiber were optimum under condition of 8%~ 10% H2SO4 and 6%~ 12% Na2SO4. The maximum tensile strength reached 2.06 cN/dtex with circular cross-sectional shapes and smooth surface. And the crystalline structure was cellulose （II）. The orientation factor changed a little.