【摘要】 以离子液体1-丁基-3-甲基咪唑氯盐([BMIM]Cl)为溶剂,分别采用直接溶解法和间接溶解法(即在含水[BMIM]Cl中溶胀后再减压蒸馏去除多余的水使之溶解)制备了纤维素/[BMIM]Cl纺丝液,系统地比较了这两种纺丝液的流变行为及可纺性。结果表明:相同条件下,直接溶解法制备的纤维素/[BMIM]Cl纺丝液的表观黏度最大,而间接溶解法制得的纺丝液的表观黏度随着溶胀时[BMIM]Cl的初始含水率的增加而下降。与直接溶解法相比,间接溶解法制得的纺丝液溶解均匀、流动性能好、纺丝过程中断头次数少、可纺性能提高,所得到的再生纤维素纤维具有更好的力学性能。更多还原

【Abstract】 In this paper,ionic liquid 1-butyl-3-methylimidazolium chloride([BMIM]Cl) was used as the solvent of cellulose,and then cellulose spinning dopes were prepared by two kinds of dissolving processes,direct dissolving process and indirect dissolving process,i.e.cellulose was firstly swelled to the maximum in aqueous [BMIM]Cl solution,and then dissolved by stirring under vacuum to remove excessive water.The rheological behavior and spinnability of cellulose spinning dopes prepared by different dissolving process were compared.The results showed that cellulose spinning dope prepared by the direct dissolving process had higher apparent viscosity than that by indirect dissolving process,and the apparent viscosity of cellulose spinning dopes prepared by indirect dissolving process decreased with the increase of the initial water content in aqueous [BMIM]Cl solution.Compared with the direct dissolving process,the cellulose spinning dope prepared by indirect dissolving process had better homogeneity,flow ability and spinnability.Moreover,the tensile strength of regenerated cellulose fibers prepared from the indirect dissolving process was higher than that from the direct dissolving process.更多还原