编织管增强型聚乳酸中空纤维膜结构及其性能

为制备兼具高强度、高分离精度的聚乳酸(PLA)中空纤维膜,采用同心圆复合纺丝技术,分别制备了PLA同质编织管与聚对苯二甲酸乙二醇酯(PET)异质编织管增强型PLA中空纤维膜。考察聚乙二醇(PEG)相对分子质量对PLA增强膜结构和性能的影响,并通过物理反冲洗、超声水浴振荡实验研究了同质、异质编织管表面分离层与增强体界面结合性能。结果表明:随PEG相对分子质量的增大,纤维膜的表面孔径逐渐减小,渗透通量先增大后减小,牛血清蛋白截留率先增大后保持稳定,添加PEG相对分子质量为10 000的增强膜的渗透通量最大且分离效果最佳;增强膜与同质编织管的界面结合性能明显优于异质的。

Structure and properties of braided tube reinforced polylactic acid hollow fiber membranes

In order to prepare polylactic acid (PLA) hollow fiber membranes with high strength and high separation precision, homogenous and heterogeneous braided tube reinforced PLA hollow fiber membranes were prepared by concentric circular spinning technique. The influences of polyethylene glycol (PEG) molecular weight on the structure and properties of the homogenous reinforced membranes were investigated. Moreover, the influences of homogenous and heterogeneous braided tubes on the interfacial bonding properties were also studied by physically back washing and ultrasonically water bathing shaking.The results show that with the increase of the PEG molecular weight, the surface pores size of the membranes decreases. In addition, the permeate flux of the membranes increases firstly and then decreases, and the bovine serum albumin rejection ratio increases first and then stabilizes with the increase of the PEG molecular weight. It is also found that the interface adhesion between homogeneous braid tube and PLA hollow fiber membranes are better than the heterogeneous ones.