以N-甲基吗啉-N-氧化物为溶剂的纤维素氨基甲酸酯纤维与Lyocell纤维的比较

Comparision of Cellulose Carbamate Fiber and Lyocell Fiber Using N-methylmorpholine-N-Oxide(NMMO)as Solvent

分别以纤维素氨基甲酸酯(CC)及纤维素为原料,采用N-甲基吗啉-N-氧化物(NMMO)为溶剂,通过干湿法纺丝制备了CC纤维及Lyocell纤维,研究比较了不同原料/NMMO·H2O纺丝液的流变性能以及所纺制纤维的结构与性能。结果表明,2种纺丝液均表现出切力变稀的流变行为,且在相同条件下CC纺丝液的表观黏度低于Lyocell纺丝液,因此有利于高浓度CC纺丝液的制备。与Lyocell纤维相比,CC纤维的结晶度和取向度略低,导致CC纤维力学性能有所下降,但其抗原纤化性能明显优于Lyocell纤维。

Cellulose carbamate(CC)and cellulose were used as raw materials,respectively,and CC fiber and Lyocell fiber were spun by dry-jet wet spinning method using N-methylmorpholine-N-oxide(NMMO)as solvent.The rheological behavior of different raw materials/NMMO·H2O spinning dopes,as well as the structure and properties of the resulted fibers were compared.The results show that both kinds of spinning dopes belong to the typical shear thinning fluids,and the apparent viscosity of CC spinning dope is lower than that of Lyocell spinning dope under the same conditions,which will be conducive to improve the concentration of CC spinning dopes.Compared with Lyocell fibers,the crystallinity and orientation of CC fiber are lower,thus the mechanical properties of CC fiber are decreased slightly,whereas CC fiber shows the better anti-fibrillation properties.