关于聚醚砜膜的研究进展

介绍了聚醚砜 (PES)膜的制备以及 PES的浓度、不同添加剂和溶剂等对膜性能的影响 ,并对 PES超滤膜的表层结构的形成作了初步的探讨。     

聚醚砜质量分数对聚偏氟乙烯/聚醚砜共混膜性能和结构的影响

用与聚醚砜共混的方法来改善聚偏氟乙烯膜的抗收缩性能,以二甲基乙酰胺作溶剂,聚乙烯吡咯烷酮为添加剂,研究了聚醚砜(PES)质量分数对聚偏氟乙烯/聚醚砜共混膜的收缩率、水通量、截留率及形态结构的影响。聚醚砜的加入可以有效地降低共混膜的收缩率,在w(PES)=1.5%时,共混膜的水通量取得极大值,截留率取得极小值。     

溶剂/非溶剂体系对聚醚砜微孔膜性能和结构的影响

以N,N-二甲基乙酰胺(DMAc)、N-甲基吡咯烷酮(NMP)和N,N-二甲基甲酰胺(DMF)为溶剂,乙醇(EtOH)、异丙醇(IPA)、正丁醇(BuOH)、一缩二乙二醇(DegOH)、聚乙二醇400(PEG400)为非溶剂添加剂,研究了溶剂/非溶剂体系对聚醚砜(PES)膜的结构和性能的影响.改变铸膜液体系中的非溶剂含量对膜的结构和性能有很大影响,但是这种影响不是以非溶剂的绝对含量来衡量的,而取决于非溶剂/溶剂的比值.改变溶剂的组成和配比也改变了溶剂/非溶剂体系,体系的溶度参数越接近PES的溶度参数,与PES的相容性越好,但是膜的通量较小.实验结果表明,采用NMP(或DMAc)与DMF以适当比例混合作溶剂,比采用单一NMP(或DMAc)作为溶剂制得的膜通量要大.通过改变溶剂配比,可实现对膜的表面开孔率、孔径、断面结构等参数的微控.     

聚醚砜合成膜的结构与性能研究

以截流率、水通量为指标,分别讨论了几种非溶剂型添加剂对聚醚砜复合超滤膜性能的影响,通过扫描电子显微镜观察了其结构,并阐述了结构与性能的关系。结果表明,w（SiO_2）为20%、w（PEG1000）为3%、w（PVP）为1%和w（MPC1501）为3%时,综合性能最好。     

共涂覆法改性聚醚砜膜络合超滤除锑应用研究

针对商业聚醚砜(PES)膜表面亲水性差,在络合超滤除锑过程中膜通量损失较大的问题.采用一步共涂覆改性法,通过在PES基膜表面形成聚多巴胺和二氧化硅纳米颗粒杂化涂层,得到高亲水性表面.对改性膜进行了表征和络合超滤实验.结果表明,优化改性条件为TEOS投加量0.6 g、时间9 h,此时制备的膜接触角仅为17.5°,亲水性能...     

聚醚砜超滤膜的制备与优化

为了给复合膜制备提供理想的支撑基膜,采用L-S相转化法制备聚醚砜超滤膜。通过正交实验设计,系统研究了各种因素对聚醚砜超滤膜性能的影响,并采用回归分析得到了模型方程。结果表明:所制备的聚醚砜超滤膜的水通量为246. 9L·m-2·h-1 (操作压力0. 1MPa),该膜对浓度为500mg/L的聚乙烯醇(PVA80 000)截留率达95%以上。     

聚醚砜和磺化聚醚砜膜结构及性能研究

采用电镜和孔径分布测定仪对自制聚醚砜( PES)和磺化聚醚砜(SPES)膜进行表征,根据Darcy-Poiseuille定律研究PES膜和SPES膜过滤牛血清蛋白液(BSA)阻力分布情况.结果表明,PES膜孔径为0.22～0.27 μm,初始纯水通量为642 L·m-2·h-1,过滤质量浓度为1 g·L-1的BSA溶液时平衡通量为30.4～31.9 L·m-2· h-1; SPES膜孔径为5.2～11.1 nm,初始纯水通量为8.1 L·m-2·h-1,质量浓度为1 g·L-1的BSA时平衡通量为3.4～6.9 L· m-2·h-1.过滤时PES膜阻力主要集中在吸附和堵孔阻力,2者相加为总阻力的91.1％;而SPES膜阻力主要集中在膜本身的阻力,为总阻力的41.8％,其次为堵孔阻力,占总阻力的38.3％.经清洗后,PES膜的纯水通量可以恢复到82％,而SPES膜可以恢复到494％.     

影响聚醚砜超滤膜性能的因素

通过对聚醚砜(PES)超滤膜的水通量，尿素去除率和肌肝去除率的测定，研究了铸膜液中聚醚砜质量分数，凝固浴质量分数，大分子添加剂PVP的含量，小分子添加剂PEG的含量对聚醚砜超滤膜的影响。     

聚醚砜纤维及织物性能研究

将聚醚砜(PES)进行熔融纺丝,制得PES纤维,并织成布样,对纤维及其织物的性能进行了研究。结果表明:PES纤维的力学性能不稳定,放置一定时间,其强度下降,需经140℃高温热定型加以改善。纤维回潮率为2．33%;织物极限氧指数为26．9%,紫外吸光度低于1．6,体积比电阻为8．13×10~(13)Ω·cm,摩擦静电压为7 272 V,1 min后衰减电压为5 519 V。     

聚醚砜／壳聚糖共混耐污染超滤膜的研制

采用相转化法,以聚醚砜（PES）、壳聚糖、聚乙二醇400（PEG400）、吐温80和LiCl／N,N-二甲基乙酰胺（DMAo）混合溶剂为原料制备聚醚砜／壳聚糖共混耐污染超滤膜。并对影响超滤膜结构和性能的各个因素进行了研究。结果表明．在壳聚糖质量分数为0．3％、反应温度为80℃条件下制备的聚醚砜／壳聚糖共混耐污染超滤膜性能最优。在25℃、0．1MPa操作条件下,膜的纯水通量为745．22（L／m2·h）,牛血清白蛋白截留率为91．79％。改性后的超滤膜表面接触角为74．6°,阻力增大系数为0．54,通量衰减速度小于未改性超滤膜,亲水性能和耐污染性能得到很大提高。     

磺化聚醚砜质子交换膜的制备及性能研究

以浓硫酸为溶剂、氯磺酸为磺化剂对聚醚砜（PES）进行了磺化，采用氢核磁共振谱（^1H NMR）、傅立叶变换红外光谱（FTIR）及热重分析（TGA）对磺化聚醚砜（SPES）进行了表征，证实PES得到了磺化。制备了一系列不同磺化度的SPES膜，测试了膜的接触角、含水率和电导率。试验结果表明，SPES具有良好的热稳定性；随着磺化度的增加，膜的亲水性能增加，膜的电导率增加。当SPES膜的磺化度达到37．0％（摩尔分数）时，SPES膜在室温下的电导率与商业化的Nafion 112膜的电导率相当。     

Direct Nanoimprint Lithography of Polyethersulfone Using Cellulose‐Based Mold

Polyethersulfone (PES) with a glass transition temperature of 224 °C is a class of high‐performance super engineering plastics with excellent heat resistance, as well as mechanical, electrical, and optical properties. However, the nanopatterning of PES using thermal nanoimprint lithography at a high temperature can induce technical difficulties. High‐accuracy 900‐nm line patterning of PES is fabricated 50 times using both a solvent‐permeable cellulose‐based mold and dimethylformamide as a dilution solvent in direct thermal nanoimprint lithography. The use of dilution solvents in PES has yet been limited in the nanoimprint lithography, and the developed processes expand the surface patterning of super engineering plastic.     

聚醚砜中空纤维血浆分离膜的孔径大小及分布

本文采用场致扫描电镜的显微观察法和膜对溶质的粒子筛分法测定聚醚砜中空纤维血浆分离膜的孔径大小及分布。通过显微镜观察统计得到膜的几何平均孔径为229nm,膜孔孔径分布在150nm,-350nm,筛分法测试得到膜的平均孔径为197nm。平均孔径大小约为200nm的聚醚砜中空纤维膜适合做血浆分离膜。     

Preparation of Anti-Fouling Polyethersulfone Ultrafiltration Membrane by an External High Voltage Electric Enhancing Method

In this article, a novel method of applying high voltage (1–5 kV) to the conventional immersion precipitation phase inversion process was used to prepare polyethersulfone ultrafiltration membranes when PVP (30 K) was used as an additive. The effects of the external electric field on the structure, surface functional groups, membrane potential, and surface hydrophilicity of the membranes were researched. Bovine serum albumin (BSA) adsorption amounts on the membranes and the separation performances of the membranes were measured. It was found that the external electric field influenced the surface carbonyl groups, surface hydrophilicity, and potential of the membranes. With the increase of the external voltage, the surface hydrophilicity and the membrane potential decreased. It seemed that the external voltage had no influence on the cross-section structure of the membranes, but the surface porosity density slightly reduced when the external voltage increased. In basic BSA solution, the protein adsorption amount on the electric enhanced membranes was distinctly reduced when compared with an un-enhanced membrane, and the rejection was also improved. Consequently, the prepared electric enhanced PES membranes had distinctive anti-fouling properties.     

Affinity Separation of Trypsin from Goat Pancreatic Extract Using a Polyethersulfone Ultrafiltration Membrane

Abstract

Ultrafiltration of goat pancreatic extract to obtain trypsin, using Soybean Trypsin Inhibitor as affinity ligand and a 30 kDa MWCO polyethersulfone membrane, is studied by examining the effect of varying transmembrane pressure and pancreatic extract: wash buffer ratio on active trypsin yield and flux/throughput profiles. For all process conditions considered, no detectable trypsin activity is found in the washing-phase permeates confirming excellent ligand-trypsin binding. Maximum trypsin yield obtained, at 1:1 feed ratio and 4 kg/cm² pressure, is 74%. Mass flux of eluted protein as well as of washed-off impurities are also maximized under these conditions.