原生纤维素静电纺丝的调控

通过电纺非溶剂调控的纤维素溶液, 制备出纤维素电纺纤维. 在N,N-二甲基乙酰胺(DMAc)-氯化锂(LiCl)溶解纤维素体系中, 以DMAc和N,N-二甲基甲酰胺(DMF)作为非溶剂, 添加到高浓度的纤维素溶液中制备电纺溶液. 考察添加非溶剂对纤维素溶液性质和电纺纤维形貌的影响. 结果表明, 添加非溶剂有助于提升纤维素溶液的可纺浓度, 获得分散性较好的电纺纤维, 其中DMF效果最好. 添加非溶剂降低了纤维素溶液的黏度, 使纤维素溶液可纺浓度提高; 添加非溶剂改变了电纺溶液的稳定性, 获得了分散良好的纳米纤维, 从而有助于纤维素射流在电纺过程中快速固化成型.

Manipulation of Native Cellulose Eletrospinning from LiCl-DMAc System

Cellulose nanofibers have been successfully fabricated by electrospinning of cellulose/lithium chloride-dimethylacetamide(LiCl-DMAc) solutions manipulated by nonsolvents. DMAc and dimethyl formamide(DMF) are used as the nonsolvents which is added into the concentrated cellulose solution. The effects of nonsolvents on the properties of cellulose solution and the morphology of electrospun cellulose nanofibers were investigated. Addition of nonsolvents is beneficial to increase the electrospinnable concentration of cellulose solution and obtain well-distributed nanofibers. The result of manipulating by DMF is better than DMAc. The improvement in electrospinnable concentration correlates well with the addition of nonsolvents which can decrease the viscosity of cellulose solution. The morphology of electrospun cellulose nanofibers is related to the rate of jet coagulation which is affected by the stability of cellulose solution during electrospinning.