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将氯甲基化聚砜(CMPSF)/聚砜(PSF)共混膜浸于三甲胺溶液中制得季铵化聚砜(QMPSF)/聚砜(PSF)膜.采用正交实验考察了季铵化反应条件如季铵化温度、季铵化时间、三甲胺浓度等对QMPSF/PSF膜性能的影响,优化了季铵化条件,制得了性能较佳的季铵化QMPSF/PSF膜.研究结果表明,在0.2MPa压力下.制备的季铵化QMPSF/PSF膜的水通量为31.35 L/(m2·h),对相对分子质量为31 000~50 000的聚乙烯醇溶液的截留率为89.6%. 相似文献
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聚砜类分离膜材料及其改性研究进展 总被引:1,自引:0,他引:1
讨论了一些常用的聚砜类分离膜材料的结构与性能,从共混、共聚和表面接枝改性等方面对聚砜类膜材料的改性进行了详细的阐述,对聚砜类膜材料的研究与应用前景进行了展望。 相似文献
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辐照接枝丙烯酸改性聚砜超滤膜 总被引:12,自引:0,他引:12
采用液相共辐照技术在聚砜超滤膜上接枝丙烯膜,通过改变辐照剂量和丙烯酸单体浓度可以获得具有不同接枝率的改性聚砜膜。实验结果表明,随着接枝率的提高,改性聚砜抗蛋白质吸附污染的能力显著增强,并且认为接枝膜的亲水性提高是膜污染减轻的主要原因。 相似文献
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探讨了铸膜液温度、特性粘度、聚砜浓度、流涎温度和十二烷基苯磺酸钠添加量等对聚砜热相转移膜性能的影响,制得了平均孔径为0.84μm、0.34μm、0.16μm的平板微孔膜。经扫描电镜观察,该膜具有对称的球状孔结构,为热相转移聚砜微孔膜。 相似文献
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纳滤膜在水处理过程中的应用越来越受到关注。本试验通过在不同条件下制备壳聚糖/聚砜复合纳滤膜,研究了膜厚度,膜干燥温度,凝固浴浓度、温度和凝固时间,交联剂浓度、温度和交联时间,热处理温度和时间等因素对膜性能的影响。试验表明制备工艺条件对膜性能影响很大,主要体现在温度、浓度和反应时间方面。最后通过试验,获得了壳聚糖/聚砜复合纳滤膜的最佳制备条件。 相似文献
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聚砜类膜和膜材的改性 总被引:2,自引:0,他引:2
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。 相似文献
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聚砜制膜液的相平衡及其与制膜的关系 总被引:2,自引:0,他引:2
测定了含不同浓度H2SO4的聚砜制膜液的分相曲线,用Flory-Huggins理论对该体系进行相平衡推算,将H2SO4的影响归纳于F-H交互作用参数对相图的影响中,计算值与实验值吻合较好,考察了聚砜分子量改变对相图的影响关系,发现分子量的改变只对低浓度区的相图略有影响。高浓度区的相图没有变化,分析了H2SO4对制膜液的作用,得取了一些对制膜的实用意义的结论,并在相图指导下制备了两种外压式聚砜管式膜 相似文献
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Saeid Maghami Morteza Sadeghi Samaneh Baghersad Beatriz Zornoza 《Polymer Engineering and Science》2021,61(7):1931-1942
A series of polysulfone (PSF) membranes were prepared using different solvents: dimethylformamide (DMF), tetrahydrofuran, dimethylacetamide, and n-methyl-2-pyrrolidone (NMP). The PSF membrane prepared by NMP showed the highest gas permeability. The influence of propionic acid as a Lewis acid on gas separation properties of the PSF was explored. The PSF membrane prepared by the casting solution containing 25 wt% PSF, 35 wt% propionic acid, and 40 wt% NMP showed a superior gas separation performance. The gas permeation measurements indicated that incorporating 30 wt% γ-alumina nanoparticles into the PSF matrix resulted in about the respective 43% and 41% increase in CO2 and O2 permeability together with a rise in CO2/CH4 and O2/N2 selectivities (13% and 7%, respectively). Furthermore, by rearranged modified Maxwell model, the role and nature of the interfacial layer in the PSF-based mixed matrix membranes were mathematically analyzed considering a reduced permeability factor. 相似文献
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Polysulfone (PSF) hollow fiber membranes were spun by phase‐inversion method from 29 wt % solids of 29 : 65 : 6 PSF/NMP/glycerol and 29 : 64 : 7 PSF/DMAc/glycol using 93.5 : 6.5 NMP/water and 94.5 : 5.5 DMAc/water as bore fluids, respectively, while the external coagulant was water. Polyvinyl alcohol/polysulfone (PVA/PSF) hollow fiber composite membranes were prepared after PSF hollow fiber membranes were coated using different PVA aqueous solutions, which were composed of PVA, fatty alcohol polyoxyethylene ether (AEO9), maleic acid (MAC), and water. Two coating methods (dip coating and vacuum coating) and different heat treatments were discussed. The effects of hollow fiber membrane treatment methods, membrane structures, ethanol solution temperatures, and MAC/PVA ratios on the pervaporation performance of 95 wt % ethanol/water solution were studied. Using the vacuum‐coating method, the suitable MAC/PVA ratio was 0.3 for the preparation of PVA/PSF hollow fiber composite membrane with the sponge‐like membrane structure. Its pervaporation performance was as follows: separation factor (α) was 185 while permeation flux (J) was 30g/m2·h at 50°C. Based on the experimental results, it was found that separation factor (α) of PVA/PSF composite membrane with single finger‐void membrane structure was higher than that with the sponge‐like membrane structure. Therefore, single finger‐void membrane structure as the supported membrane was more suitable than sponge‐like membrane structure for the preparation of PVA/PSF hollow fiber composite membrane. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 247–254, 2005 相似文献
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To construct a phase diagram of the polysulfone (PSF)/polyethersulfone (PES)/N‐methyl‐2‐pyrrolidone (NMP)/water quaternary system, cloud point measurements were carried out by a titration method. The miscible region in the PSF/PES/NMP/water quaternary system was narrow compared to the PSF/NMP/water and PES/NMP/water ternary systems. The binary interaction parameters between PSF and PES were estimated by water sorption experiments. The calculated phase diagram based on the Flory–Huggins theory fit the experimental cloud points well. In addition to the usual polymer–liquid phase separation, polymer–polymer phase separation, which resulted in a PSF‐rich phase and a PES‐rich phase, was observed with the addition of a small amount of nonsolvent. The boundary separating these two modes of phase separation could be well described and predicted from the calculated phase diagrams with the estimated binary interaction parameters of the components. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 2113–2123, 1999 相似文献
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V. A. Deimede K. V. Fragou E. G. Koulouri J. K. Kallitsis G. A. Voyiatzis 《Polymer》2000,41(26):9095-9101
Miscibility in a series of blends, derived from Polyamide 11 (PA 11) and sulfonated polysulfone (SPSF) with different sulfonation degrees, 20, 44 and 70% has been investigated using differential scanning calorimetry, dynamic mechanical analysis, Fourier transform infra-red (FT-IR) and Raman spectroscopy. The PA 11/SPSF(Na)x blends were prepared by solution casting from dimethyl formamide (DMF). Differential scanning calorimetry has shown a melting point depression of the equilibrium melting point of PA 11. From the melting point data of the blends of PA 11 with the SPSF with a 70% degree of sulfonation, the value of the polymer–polymer interaction parameter χ12 was found to be −1.1 at elevated temperatures where it was determined. Less negative values were obtained for the blends of SPSFs with lower degrees of sulfonation, indicating the role of the sodium sulfonate group to the observed miscibility. Dynamical mechanical analysis revealed a non single-phase system at lower temperatures, although the Tg of PA 11 phase is shifted to higher temperatures. FT-IR and FT-Raman spectroscopic techniques have been used to confirm the nature of the specific interactions involved. 相似文献
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