改性聚偏氟乙烯中空纤维分离膜的研制

本实验采用干-湿相转化法制备聚偏氟乙烯（PVDF）中空纤维血液分离膜，通过在铸膜液中引入聚乙烯醇(PVA)与戊二醛反应交联物，改善膜材料的亲水性。研究了PVDF浓度、PEG含量等对膜性能的影响。结果表明，改性聚偏氟乙烯(PVDF)血液分离膜的亲水性明显提高，接触角从70.2。降至54.5。，水通量从85.4L/(h.m2)-1提高到189.4L/(h.m2)-1，蛋白吸附性量则从92mg/m2降至27mg/m2，有较好的化学稳定性。随着PVDF浓度的增加，膜的拉伸性能增强，破裂压增大，水通量和膜分离孔径减小；随着PEG含量的提高，膜的机械性能变化不大，水通量明显提高。

Preparation of modified PVDF hollow fiber separating membrane

In this thesis, PVDF hollow fibers blood separate membrane are fabricated by using dry-wet phase inversion method. The hydrophilic of membrane materials is improved by the introduction of polyvinyl alcohol (PVA) with glutaraldehyde cross-linking reaction in the casting solution. The concentration of PVDF, PEG and other effects can affect membrane performance. The results indicated that the modifications of PVDF blood separate membrane significantly increase hydrophilic and water flux, decrease protein adsorption and have better chemical stability. The contact angle decreased from 70.2。 to 54.5。, the amount of protein adsorption decreased from 92mg/m2 to 27mg/m2 while Pure water flux from 85.4L / (h . m2) -1 to 189.4 L / (h . m2) -1. The tensile and burst pressure of membrane increased while the water flux and pore size decreased with the concentration of PVDF. The mechanical performance of membrane material has little changed while the water flux increased with the concentration of PEG.