致孔剂聚乙二醇对纤维素中空纤维膜结构与性能的影响

Influence of Pore-Forming Agent Polyethylene Glycol on Cellulose Hollow Fiber Membranes Structure and Properties

以离子液体氯代1-烯丙基-3-甲基咪唑([AMI M]Cl)为溶剂纺制纤维素中空纤维膜,考察了聚乙二醇(PEG)分子量及其质量分数对中空纤维膜结构与性能的影响。采用场发射扫描电子显微镜(FESEM)对膜内、外表面形态结构进行了观察,测试了中空纤维膜的水通量、截留率等渗透性能以及最大拉伸强度、断裂伸长率等力学性能。结果表明:随着PEG的分子量减小,中空纤维膜外表面与内表面结构变得更加规整,膜孔隙率与水通量上升,最大拉伸强度、断裂伸长率等力学性能则逐渐减小;随着PEG质量分数的增加,膜孔隙率与水通量变大,最大拉伸强度、断裂伸长率等力学性能逐渐减小。PEG的重均分子量为2.0×104,质量分数为5%时,膜的渗透性能和力学性能最好。

Cellulose hollow fiber membrane was spun with ionic liquid 1-allylic-3-methyl imidazole chloride（Cl） as solvent.The influence of the molecular weight and the mass fraction of polyethylene glycol（PEG） on the structure and properties of cellulose hollow fiber membrane were investigated.Field emission scanning electron microscopy（FESEM） was used to observe the membrane＇s inner and outer surface morphology structure.The pure water flux,porosity,maximum tensile strength and elongation of membrane at break were tested.The results showed,with the decrease of molecular weight of PEG,outer and inner surface structures of hollow fiber membrane become neater,membrane porosity and pure water flux increased,the maximum tensile strength and elongation at break of the membrane properties gradually become smaller.With the increasing of mass fraction of PEG,membrane porosity and pure water flux become larger,and the maximum tensile strength and elongation at break of the membrane criterion decrease gradually.When the molecular weight of PEG is 2.0×104 and mass fraction is 5%,there are the best permeability and mechanical performance.