聚砜类膜和膜材的改性

聚砜膜广泛应用于生物学分离上，但由于其蛋白质污染问题，导致膜的通透率下降，选择性改变。目前解决这一问题的办法是对膜或膜材进行亲水性改性。就聚砜类膜和膜材的改性情况作一概述，对比各种方法的优缺点，对聚砜类膜和膜材改性前景进行了展望。     

磺化聚砜类膜材料的制备及其在水处理中的应用

对聚砜类膜材料的制备及其在水处理中的应用作了详细综述,以期为高性能磺化聚砜类分离膜材料的制备及应用提供一定的理论指导.磺化不仅可提高聚砜类膜材料的亲水性和耐热性能,而且可有效改善功能膜的渗透通量、选择分离特性与抗污染性能,从而促进该类膜材料在水净化、水脱盐、物质分离与纯化等领域中的应用.磺化聚砜类膜材料的磺化度对分离膜...     

聚砜超滤膜表面辐照改性研究

实验以聚砜为膜材料,聚乙二醇（PEG）为添加剂,采用浸入沉淀相转化法制备聚砜平板超滤膜,然后对实验制备的聚砜膜进行紫外辐照改性,考察了辐照对聚砜膜结构和性能的影响,研究了膜辐照前后断裂强度的变化,通过表面接触角测定仪、红外分析仪（FTIR）、扫描电镜（SEM）、改性膜的水通量和截留性能等方法来表征膜辐照前后的结构和性能变化,聚砜超滤膜经紫外辐照改性取得了良好的效果。     

聚砜及其复合材料研究进展

系统阐述了聚砜及其复合材料的研究进展.着重介绍了聚砜类材料改性技术发展趋势、市场需求状况、已商业化产品种类及改性研究的概况;并对改性聚砜类材料的发展应用前景作了展望.     

聚砜膜研究进展

聚砜类膜有着突出的分离性能,近年来被广泛应用于膜分离工程。本文从膜制备方法、沉浸凝胶法成膜条件、隔膜改性应用三方面阐述了聚砜类分离膜的国内外最新研究进展,并对聚砜类分离膜的前景做了展望。     

膜分离材料在含油废水处理中的研究进展

工业生活含油废水的排放对生态环境造成了严重的损害,高效节能新型油水分离材料已成为研究热点。本文重点介绍了无机陶瓷膜、有机聚烯烃膜、聚砜类膜、含氟类聚合膜以及纳米改性材料膜在含油废水中的应用。分析了不同膜分离材料的优缺点并提出了展望。     

聚砜超滤膜表面辐照改性研究

以聚砜为膜材料,聚乙二醇（PEG）为添加剂,采用浸入沉淀相转化法制备聚砜平板超滤膜,然后对实验制备的聚砜膜进行紫外辐照改性,考察了辐照对聚砜膜结构和性能的影响,研究了膜辐照前后断裂强度的变化,通过表面接触角测定仪、红外分析仪（FTIR）、扫描电镜（SEM）、改性膜的纯水通量和截留性能等方法来表征膜辐照前后的结构和性能变化。研究表明,聚砜膜断裂强度经辐照后强度变小,但是降低幅度不大;在乙醇溶液中紫外辐照后,开始纯水通量提高而截留率降低,但降低幅度不大,时间增加到一定时通量又降低,截留率变化也不大;表面接触角随辐照时间的增长而减小,表明改性后膜表面的亲水性得到明显改善;通过FTIR分析证实在聚砜膜表面产生了新的官能团;SEM实验证实反应只发生在聚砜膜的表面而非膜内部。聚砜超滤膜经紫外辐照改性取得了良好的效果。     

聚砜超滤膜表面辐照改性研究

以聚砜为膜材料,聚乙二醇(PEG)为添加剂,采用浸入沉淀相转化法制备聚砜平板超滤膜,然后对实验制备的聚砜膜进行紫外辐照改性,考察了辐照对聚砜膜结构和性能的影响,研究了膜辐照前后断裂强度的变化,通过表面接触角测定仪、红外分析仪(FTIR)、扫描电镜(SEM)、改性膜的纯水通量和截留性能等方法来表征膜辐照前后的结构和性能变化.研究表明:聚砜膜断裂强度经辐照后变小,但降低幅度不大;在乙醇溶液中紫外辐照后,开始纯水通量提高而截留率降低,但降低幅度不大,时间增加到一定时通量又降低,截留率变化也不大;表面接触角随辐照时间的增长而减小,表明改性后膜表面的亲水性得到明显改善;通过FTIR分析证实在聚砜膜表面产生了新的官能团;SEM实验证实反应只发生在聚砜膜的表面而非膜内部.聚砜超滤膜经紫外辐照改性取得了良好的效果.     

聚砜中空纤维膜改性及其应用研究

进行了改性中空纤维膜的制备，在聚砜制膜体系中加入磺化聚砜材料以改变膜的孔径分布、亲疏水性及荷电性。同时进行了将制备的共混膜元件用于造纸黑液处理的运行试验。     

聚砜类燃料电池质子交换膜研究进展

介绍了质子交换膜的分类，综述了主链型聚砜质子交换膜、侧链型聚砜质子交换膜、无机掺杂复合型聚砜质子交换膜等聚砜类燃料电池质子交换膜的最新研究进展，全面阐述了磺化聚砜的形貌、结构对材料物理化学性能的影响，并展望了聚砜类燃料电池质子交换膜的发展前景。     

Layered structure formation in the reaction-induced phase separation of epoxy/polysulfone blends

In an epoxy/polysulfone blend, the reaction-induced phase separation behavior and the final morphology were investigated. Three distinct morphological structures were obtained. Sea-island and nodular structures were observed at lower and higher polysulfone contents, respectively. A three-layered structure was obtained in the middle polysulfone concentration range. In order to understand the formation of three-layered structure, phase separation process was studied using time-resolved light scattering, phase-contrast optical microscope and scanning electron microscope. Bicontinuous structure formed uniformly in the whole sample at the beginning of phase separation. After the phase structure grew for a certain time, large domains formed and developed. Then, the large epoxy-rich domains gradually flew to the outer space of the sample film. This process assisted the formation of the three-layered structure. The mechanism of the formation of the three-layered structure was discussed based on the different viscoelastic properties of the components.     

Studies on cellulose acetate–polysulfone ultrafiltration membranes: I. Effect of polymer composition

Ultrafiltration techniques have particular advantages for simultaneous purification, concentration and fractionation of macromolecules. Studies are presented on novel ultrafiltration membranes, based on cellulose acetate and polysulfone blends, for the separation of proteins and heavy metal ions. The effects of polymer composition on pure water flux, water content, molecular weight cut‐off and hydraulic resistance are discussed. Scanning electron microscopy images of the membranes show the presence of segregated individual domains of cellulose acetate and polysulfone. The molecular weight cut‐off obtained from the protein separation studies is also presented. Applications of these membranes for separating metal ions from aqueous streams are discussed. Copyright © 2005 Society of Chemical Industry     

Pervaporation separation of water/ethanol mixture using asymmetric ion‐exchange membranes containing aluminum ions

The asymmetric aluminum ion exchange polysulfone membranes have successfully been prepared for the dehydration of ethanol‐water mixture. The relationship between the membrane morphology, separation performance, and the ion content of membranes were discussed in this study. The experimental results showed that the separation performance of those membranes was increased upon increasing the degree of aluminum ion exchange in polysulfone membranes. Both permeation rate and separation factors of those membranes increased with increasing the degree of ion exchange. The increase in separation performance of aluminum ion exchange membranes was mainly attributed to ion crosslinking in polymer network and the hydration effects of exchanged ion in membranes. On the other hand, the operating temperature in the PV process showed a significant influence on the dehydration of water molecules in the permeate. An increase in temperature increased the permeation flux of permeate but slightly decreased its selectivity. The aluminum asymmetric ions in membranes showed a strong influence on permselectivity of asymmetric ion exchange membranes. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Pervaporation separation of a water/ethanol mixture by a sodium sulfonate polysulfone membrane

A sodium sulfonate polysulfone membrane was prepared for the dehydration of a water/ethanol mixture by pervaporation. The separation performances of water and ethanol were examined by the testing of the ethanol/water mixture under operating conditions. The permselectivity of the sodium sulfonate polysulfone membrane was found to strongly depend on the sodium content in the membrane. The sodium sulfonate ratio showed a significant influence on the hydrophilicity and diffusion behavior of the polysulfone membrane. Moreover, the difference in the diffusion of the permeates played an important role in the sulfonate polysulfone membrane. It was found that a high‐performance pervaporation membrane could be achieved with a sodium sulfonate polysulfone membrane. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3374–3383, 2003     

Sulfonated polysulfone membranes with antifouling activity

The protein fouling phenomenon was investigated on modified polysulfone ultrafiltration membranes. The sulfonation degree was correlated to the extent of deposition of bovine serum albumin. It was shown that membranes prepared from modified polysulfone were less fouled than their off-charge analogues. The fouling phenomenon was also investigated for membranes prepared from co-cast blends. It was demonstrated that blends containing more than 50 wt.-% of sulfonated derivative behaved like a membrane from pure sulfonated polysulfone. The effect was attributed to surface separation of polymers and formation of surfaces enriched with sulfonic groups.     

Gas permeabilities of CO2 and CH4 for polysulfones substituted with bromo and trimethylsilyl groups

Bromobisphenol A trimethylsilylated polysulfone (BTMSPSf) was synthesized, and the effect of bromo and trimethylsilyl groups on the pure CO₂ and CH₄ transport properties of polysulfone was examined. The ideal separation factor for BTMSPSf is reduced by about 10% than that for unmodified polysulfone (PSf), but BTMSPSf is about two times more permeable than PSf. The effect of the substituents on chain packing was related to the gas permeation properties. Fractional free volume (FFV) calculation, d-spacing and cohesive energy density were used to judge chain packing. In comparison with PSf, the higher values of permeability coefficients for BTMSPSf are due to higher FFV and d-spacing. The small decrease in ideal separation for BTMSPSf is explained as follows: the potential increase in FFV due to packing-disrupting bulky trimethylsilyl groups is overridden by the increase in cohesive energy density attributed to the addition of bromo substituents.     

聚砜注塑工艺及制品缺陷对策

介绍了聚砜(PSU)的结构、性能,并结合制品设计、模具设计等对PSU的注射成型要点进行了讨论。详细分析了PSU的注塑工艺参数,系统阐述了PSU在注射成型中常见的缺陷及解决方法。     

Interactions between Chlorolignin and Polysulfone Ultrafiltration Membranes

Abstract

Interactions between chlorolignin and polysulfone ultrafiltration membranes have been studied by means of direct adsorption measurements and ultrafiltration experiments. The electrical properties of the membrane (zeta potential) and the chemical and physical properties of aqueous chlorolignin have been determined. Phenomena and parameters affecting separation of chlorolignin from aqueous solutions at various pH levels are discussed.     

用动态旋叶压滤机澄清菠萝汁的实验研究

动态过滤技术与膜技术相结合是目前固液分离领域的研究热点。采用澄清剂法澄清菠萝汁,存在缺陷。本文在动态旋叶压滤机中,研究了无机Ni膜和聚砜膜用于菠萝汁澄清过程的过滤特性。研究表明,无机Ni膜和聚砜膜澄清菠萝汁的膜通量分别是按指数和乘幂关系衰减的;果汁浓度和剪切速度的交互作用对膜通量有较大影响;无机Ni膜的通量显著高于聚砜膜的通量(3￣4倍),且无机Ni膜的稳定过滤时间比聚砜膜的稳定过滤时间长得多。     

The transport properties of CO2 and CH4 for brominated polysulfone membrane

The sorption and permeation properties of CO₂ and CH₄ for synthesized brominated polysulfone, BPSf (bromobisphenol A polysulfone) were measured, and compared with the values for PSf (bisphenol A polysulfone), MPSf (bisphenol A methylated polysulfone) and TMSPSf (bisphenol A trimethylsilylated polysulfone) to investigate the structure-property relationships. Especially, the effect of polarity of substituents on the transport properties was studied. The effect of operating pressure on the permeation properties of polysulfones was examined. The permeation properties for a mixture of CO₂ and CH₄ were also measured, and these results were compared with those obtained from the experiments of pure gases. The sorbed concentrations and permeability coefficients are well fitted to the dual mode model. The permeability coefficients of each gas of a binary mixture are less than those of pure gases, and the extent of reduction in permeability coefficient is larger for less permeable polymer. The ideal separation factor for four polysulfones increases in the following order: TMSPSf< PSf< BPSf< MPSf. The ideal separation factor for BPSf is higher than other polysulfones having similar permeability coefficients of CO₂ with BPSf. It can be explained that the strong polarity of bromine in BPSf increases cohesive energy density of polymer, and reduces the chain packing-inhibiting ability. The ranking of permeability coefficient correlates well with fractional free volume. The variation of d-spacing is not consistent with the permeability coefficient.