聚乙二醇改性冠醚功能化聚砜阴离子交换膜的制备及表征

为了实现聚砜基阴离子交换膜(AEMs)高离子导电性和良好的耐碱性,采用绿色环保的方法制备了氯甲基化聚砜,并以氨基冠醚为交联剂,以氨基冠醚络合的金属离子和三乙胺为阳离子基团,制备了三乙胺和氨基冠醚质量分数不同的冠醚功能化聚砜膜(PSF-CE_(X)-QA_(1-X))。通过将低分子质量的聚乙二醇(PEG)引入(PSF-CE_(X)-QA_(1-X))中,探究了PEG对膜性能的影响。结果表明,亲水PEG的存在有助于膜中离子通道的形成;与PSF-CE_(X)-QA_(1-X)相比,PSF-CE_(X)-QA_(1-X)-PEG的电导率和耐碱稳定性均得到了提高;在温度为80℃时,PSF-CE_(0.1)-QA_(0.9)-PEG的电导率为56.78 mS/cm,耐碱性测试后其电导率可维持初始电导率的85%。此外,PSF-CE_(X)-QA_(1-X)-PEG还具有良好的尺寸稳定性和热稳定性。

甘油微胶囊搭载硅烷环氧共混涂层的耐蚀性研究

为了提高金属基体的耐蚀性,采用溶剂蒸发法制备了水包油乳液体系的聚砜包覆甘油的微胶囊,并在基体表面制备了含有微胶囊的硅烷环氧共混涂层。通过扫描电镜、红外、热重、电化学分析对微胶囊和含有微胶囊的环氧硅烷共混涂层的形貌结构、热稳定性、耐蚀性等进行研究。结果表明:以聚砜为壁材包裹的微胶囊的平均粒径为150μm,且聚砜对甘油的包封效率为12%,胶囊的热分解温度为320℃。在3.5%(质量分数,下同)NaCl溶液浸泡下,当硅烷的添加量为3%时,硅烷的水解缩合弥补了环氧涂层的缺陷,使硅烷环氧共混涂层的阻抗模值提高到8×10^(6)Ω·cm^(-2);此外,添加微胶囊的硅烷环氧涂层由于微胶囊中缓释剂的释放吸附在金属基体表面,延缓了金属腐蚀的速度,阻抗模值提高到2×10^(7)Ω·cm^(-2),耐蚀性增强。

SYNTHESIS,CHARACTERIZATION AND PROPERTIES OF ORGANOCLAYMODIFIED POLYSULFONE/EPOXY INTERPENETRATING POLYMER NETWORK NANOCOMPOSITES

Organoclay-modified hydroxylterminated polysulfone (PSF)/epoxy interpenetrating network nanocomposites (oM-PSF/EP nanocomposites) were prepared by adding organophilic montmorillonite (oMMT) to interpenetrating polymer networks (IPNs) of polysulfone and epoxy resin (PSF/EP) using diaminodiphenylmethane (DDM) as curing agent.The mechanical properties like tensile strength,tensile modulus,flexural strength,flexural modulus and impact properties of the nanocomposites were studied as per ASTM standards.Different...

多磺酸粘多糖乳膏联合京万红软膏治疗Ⅰ、Ⅱ期压疮的效果观察

目的探讨多磺酸粘多糖乳膏联合京万红软膏在治疗Ⅰ、Ⅱ期压疮的效果。方法选择2022年4月至2023年9月在本院骨科收治的带入Ⅰ、Ⅱ期压疮患者60例参与研究,按照随机数字表法分为试验组与对照组,每组30例,对照组使用传统换药治疗,试验组采用多磺酸粘多糖乳膏联合京万红软膏治疗。对比两组治疗后的临床疗效、临床指标、治疗舒适度、治疗前后创面恢复及生活质量的差异性。结果对照组治疗有效率为63.33%(19/30),试验组的治疗有效率为86.67%(26/30),试验组的治疗有效率高于对照组,差异具有统计意义(P<0.05);试验组在水泡吸收时间、创面结痂时间、压疮愈合时间、换药次数均低于对照组,差异具有统计意义(P<0.05);对照组治疗舒适度为66.67%(20/30),试验组的治疗舒适度为90.00%(27/30),试验组的治疗舒适度高于对照组(P<0.05);两组在治疗前,PUSH评分和WHOQOL—Bref评分差异无统计学意义(P>0.05);治疗后,两组PUSH评分均比治疗前有所降低,WHOQOL—Bref评分有所升高,且试验组PUSH评分低于对照组,WHOQOL—Bref评分高于对照组(P<0.05)。结论多磺酸粘多糖乳膏联合京万红软膏治疗Ⅰ、Ⅱ期压疮中发挥良好的功效,能提高临床的治疗效果,促进伤口愈合,提高患者治疗的舒适感和生活质量。

聚丙烯腈/聚砜双尺度纳米纤维膜的制备、表征及空气过滤应用

通过模块化静电纺丝技术,制备了一种由掺杂氟化聚氨酯(FPU)的聚丙烯腈(PAN)纳米纤维与聚砜(PSF)纳米纤维组成的双尺度复合纳米纤维膜空气过滤材料,并对其性能进行了表征。该复合膜平均孔径仅有1.35μm,孔隙率达到94.4%,对PM0.3的过滤效率达到99.90%,压降仅有68 Pa,品质因子高达0.101 Pa^(-1),实现了高效低阻。此外,聚丙烯腈纤维膜在氟化聚氨酯掺杂量达到18 wt%时,纤维直径为70±5 nm,水接触角高达153°。通过在COMSOL multiphysics 6.1软件上建立空气流场来模拟纤维膜的滤效和压降,进一步证明了该纤维膜具有优异的高效低阻性能。将双尺度纳米纤维膜与纺粘无纺布进行超声复合后,经打折、封边制备成品过滤器,并将其与商用过滤器进行了对比,在5 min内PM_(2.5)浓度仍保持在18μg·m^(-3),过滤性能明显优于商用过滤器。可为构建高效低阻的纳米纤维空气滤材提供一种思路。

共价改性氧化石墨烯/聚砜混合基质膜的研究进展

聚砜(PSF)膜具有易改性、稳定性好和机械强度高等优点,在水处理中得到了广泛应用,但聚砜膜的疏水性造成了严重的膜污染。氧化石墨烯(GO)具有较大的比表面积、良好的化学性能。各种含氧的亲水官能团,如羧基、环氧基和羟基,可用于提高膜的亲水性。介绍了各种共价改性氧化石墨烯的方法,综述了近年来共价改性氧化石墨烯/聚砜膜的应用。与纯聚砜膜相比,改性后的聚砜膜在渗透性、选择性和防污性能方面均有提高,具有克服渗透性-选择性权衡的潜力,有助于提高废水处理能力。

2022-2023年世界塑料工业进展(Ⅱ):工程塑料和特种工程塑料

收集了2022年7月-2023年6月世界工程塑料和特种工程塑料工业的相关资料,介绍了2022-2023年世界工程塑料和特种工程塑料工业的发展情况,按工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯)和特种工程塑料(聚邻苯二甲酰胺、聚苯硫醚、液晶聚合物、聚醚酰亚胺、聚砜和聚醚酮)不同品种的顺序,对树脂的产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。

超脉冲二氧化碳点阵激光联合多磺酸粘多糖乳膏治疗凹陷性痤疮瘢痕的临床效果

目的分析超脉冲二氧化碳点阵激光与多磺酸粘多糖联合治疗凹陷性痤疮瘢痕的临床效果。方法研究选取我院2022年10月-2023年10月临床收治凹陷性痤疮瘢痕患者60例,随机分组为对照组(30人)与治疗组(30人),所有患者均接受超脉冲二氧化碳点阵激光治疗,观察组在治疗中联合多磺酸粘多糖乳膏治疗,对比组间治疗效果。结果治疗后,接受治疗组ECCA评分相较于对照组更低(P<0.05);治疗组反应发生率低于对照组(3.33%VS 20.00%)(P<0.05);治疗组治疗6个月后临床治疗有效率显著高于对照组(χ2=7.925,P<0.05)。结论激光联合药物治疗凹陷性痤疮瘢痕的疗效更佳,能显著降低患者痤疮瘢痕症状且不良反应发生率低。

Anti-fouling ultrafiltration membrane prepared from polysulfone-graft-methyl acrylate copolymers by UV-induced grafting method

Membrane fouling is one of the most important challenges faced in membrane ultrafiltration operations. The copolymers of polysulfone-graft-methyl acrylate were synthesized by homogeneous photo-initiated graft copolymerization. The variables affecting the degree of grafting, such as the time of UV （Ultraviolet-visible） irradiation and the concentrations of the methyl acrylate and photoinitiator, were investigated. The graft copolymer membranes were prepared by the phase inversion method. The chemical and morphological changes were characterized by attenuated total reflection-Fourier transform infrared spectroscopy （ATR/FT-IR）, scanning electron microscopy, and water contact angles measurements. Results revealed that methyl acrylate groups were present on the membranes and the graft degree of methyl acrylate had remarkable effect on the performance of membranes. Pure water contact angle on the membrane surface decreases with the increase of methyl acrylate graft degree, which indicated that the hydrophilicity of graft copolymer membranes was improved. The permeation fluxes of pure water and bovine serum albumin solution were measured to evaluate the antifouling property of graft copolymer membranes, the results of which have shown an enhancement of antifouling property for graft copolymer membranes.

Investigation of polysulfone film on high-performance anode with stabilized electrolyte/electrode interface for lithium batteries

Lithium metal has been considered to be the most promising anode material for the new generation of energy-storage system.However,challenges still stand in protecting lithium metal from spontaneous reactions with electrolytes and preventing the dendritic propagation,both of which would lead to undesirable decrease in Coulombic efficiency.Polysulfone(PSf)membrane with high rigidity and free-volume cavities of approximately 0.3 nm was employed to provide a stable interface on the surface of anodic electrode.The isotropic channels were constructed by the interconnected and uniformly distributed free volumes in the polymer matrix,and were expected to be swelled by solvent molecules and anions of lithium salt and to allow Li+ions to pass through onto the electrode surface.As a result,dendrite-free morphology of deposited lithium was observed.The stabilized interface arose from the PSf film was verified by the promoted performances of Cu|Li cells and steady voltage polarization of Li|Li cells.The full cell with PSf coated anode exhibited excellent cyclability(85%capacity retention rate over 400 cycles at 1C)and an outstanding rate capability(117 m Ah g-1 at 5C).The beneficial performances were further verified by the EIS results.This work provides a new strategic idea to settle the dendritic problems of Li metal anodes.

Gas-initiation under UV and liquid-grafting polymerization on the surface of polysulfone hollow fiber ultrafiltration membrane by dynamic method

Using the inner-surface of polysulfone hollow fiber ultrafiltration membranes as grafted layer, the method of gas-initiation and liquid-polymerization has been studied, which aimed to adjust the diameter of the pores in the membranes. The degree of polymerization varied with the changes of the parameters, such as irradiation time, monomer concentration, temperature and time of polymerization and so on. The results indicated that using benzophenone(BP) which is in a gaseous condition as photo-initiator, acrylamide as graft monomer, the polyacrylamide chain was grafted on the surface of membranes. After the surface membrane being modified, the water flux and retention altered,and thus it can be seen that the diameter of the pores in the membrane was altered. These experiments contribute to finding a new way to produce the hollow fiber membrane with the small pore size and are extraordinarily worth developing and studying.

Spray coating of polysulfone/poly(ethylene glycol) block polymer on macroporous substrates followed by selective swelling for composite ultrafiltration membranes

Polysulfone(PSF) is extensively used for the production of ultrafiltration(UF) membranes thanks to its high strength,chemical stability,and good processibility.However,PSF is intrinsically hydrophobic,and hydrophilic modification is always required to PSF-based membranes if they are intended to be used in aqueous systems.Facile strategies to prepare hydrophilic PSF membranes are thus highly demanded.Herein we spray coat a PSF-based amphiphilic block polymer onto macroporous substrates followed by selective swelling to prepare flat-sheet PSF UF membranes.The polymer is a triblock polymer containing PSF as the majority middle block tethered with shorter block of polyethylene glycol(PEG) on both ends,that is,PEG-b-PSF-b-PEG.We use the technique of spray coa ting to homogeneously dispense diluted triblock polymer solutions on the top of macroporous supports,instantly resulting in uniform,defect-free polymer coating layers with the thickness down to ~1.2 μm.The bi-layered composite structures are then immerged in ethanol/acetone mixture to generate mesoscale pores in the coating layers following the mechanism of selective swelling-induced pore generation,thus producing composite membranes with the mesoporous triblock polymer coating as the selective layers.This facile strategy is free from additional hydrophilic modification and much smaller dosages of polymers are used compared to conventional casting methods.The pore sizes,porositie s,hydrophilicity,and consequently the separation properties of the membranes can be flexibly tuned by changing the swelling duration and the composition of the swelling bath.This strategy combining spray coating and selective swelling is upscalable for the production of highperformance PSF UF membranes.

Preparation of antifouling ultrafiltration membranes from copolymers of polysulfone and zwitterionic poly(arylene ether sulfone)s

The past few decades have witnessed rapid gains in our demands of antifouling membranes such as water purification membranes and hemodialysis membranes.A variety of methodologies have been proposed for improving the antifouling performance and the hemocompatibility of the membranes.In this study,a series of copolymers(PSF-PESSB)containing polysulfone(PSF)and poly(arylene ether sulfone)bearing pendant zwitterionic sulfobetaine groups(PESSB)were prepared via one-pot polycondensation.Subsequently,the ultrafiltration(UF)membranes were prepared from different zwitterion-containing copolymers.The prepared membranes showed high thermal stability and mechanical properties.Besides,it also displayed attractive antifouling performance and blood compatibility.Compared with the original PSF membrane,the amount of protein absorption on the modified membrane was reduced;the flux recovery ratio and the resistance to blood cells were significantly improved.The results of this work suggest that PSF-PESSB membranes are expected to be applied in blood purification.The introduction of zwitterion-containing polymers to membranes paves ways for developing advanced hemodialysis technologies for crucial process.

Fabrication of Poly(vinylidene fluoride) /Polysulfone Flat Blend Membranes via Thermally Induced Phase Separation Process for Water Treatment

Poly(vinylidene fluoride) /polysulfone(PVDF/PSF) flat blend membrane was prepared via thermally induced phase separation(TIPS) technique.The membrane formation mechanism and membrane structure were investigated and the effects of PSF/PVDF weight ratio on morphology,crystallinity,porosity,and mechanical properties of the membrane were discussed.The relationship between membrane structure and performances,such as pure water flux and the rejection of carbonic black,was also discussed.It was found that solid-liquid(S-L) phase separation occurred for the PVDF/PSF/diluent system.The addition of PSF influences structure and crystallinity of the membrane,which in turn influences mechanical properties and performances of the membrane.The results reveal that it is possible to obtain network structure via S-L phase separation by blending the polymer,which has a partial compatibility with PVDF.

New high permeable polysulfone/ionic liquid membrane for gas separation

In this study,the effects of 1-Ethyl-3-methylimidazolium tetrafluoroborate ionic liquid on CO2/CH4 separation performance of symmetric polysulfone membranes are investigated.Pure polysulfone membrane and ionic liquid-containing membranes are characterized.Field emission scanning electron microscopy(FE-SEM)is used to analyze surface morphology and thickness of the fabricated membranes.Energy dispersive spectroscopy(EDS)and elemental mapping,Fourier transform infrared(FTIR),thermal gravimetric(TGA),X-ray diffraction(XRD)and Tensile strength analyses are also conducted to characterize the prepared membrane s.CO2/CH4 separation performance of the membranes are measured twice at 0.3 MPa and room temperature(250 C).Permeability measurements confirm that increasing ionic liquid content in polymer-ionic liquid membranes leads to a growth in CO2 permeation and CO2/CH4 selectivity due to high affinity of the ionic liquid to carbon dioxide.CO2 permeation significantly increases from 4,3 Barrer(1 Barrer=10^-10 cm^3(STP)·cm·m^-2·s^-1·cmHg^-1,1 cmHg=1.333 kPa)for the pure polymer membrane to 601.9 Barrer for the 30 wt%ionic liquid membrane.Also,selectivity of this membrane is improved from 8.2 to 25.8.mixed gas te sts are implemented to investigate gases interaction.The results showed,the disruptive effect of CH4 molecules for CO2 permeation lead to selectivity decrement compare to pure gas te st.The fabricated membranes with high ionic liquid content in this study are promising materials for industrial CO2/CH4 separation membranes.

Synthesis and Characterization of Polysulfone Hydrogels

Polysulfone (PSF) membranes are frequently used in ultrafiltration, due totheirchemical and structural stability and mechanical robustness. Despite these advantages, successful utilization of this membrane technology has been greatly limited by the susceptibility of these membranes to fouling, due totheirhydrophobic nature. Here we report on the synthesis and characterisation of hydrophilic PSF membrane materials prepared by incorporation of polyvinyl alcohol, through chemical crosslinking to produce mechanically and chemically stable PSF hydrogels. The hydrogel composition was controlled at three different ratios to evaluate the effect of the PSF contributioni.e.25:75, 50:50 and 75:25. PSF hydrogels were characterized using high resolution scanningelectronmicroscopy (HR-SEM), cyclicvoltammetry (CV), and drop shape analysis techniques. The polysulfone hydrogels formed showed a decrease in contact angle by 50% for all hydrogels regardless of their polysulfone contribution, confirming an improvement in hydrophilic nature. The electron diffusion and ionic transport properties of thehydrogels as immobilised thin films in aqueous solutions,wereevaluated using cyclic voltammetry.

Modification Effect of Nano-Graphene Oxide on Properties and Structure of Polysulfone Ultrafiltration Membrane

In order to improve the purification properties of polysulfone (PSF) ultrafiltration membranes (UFM), nano-graphene oxide (nano-GO) was taken as modifier, and the physical blending process was adopted in our experiment. The microstructure, surface morphology and functional groups of modified UFM have been characterized respectively by scanning electron microscopy, atomic force microscopy and Fourier transform infrared spectroscopy, and the static contact angle between the membrane surface and the water droplet has also been detected to show the change of its hydrophilicity. Through experiments, it has been found that modified UFM has larger and more developed finger micro-pores, and there exist a large number of -OH groups on its surface, and also its hydrophilicity has been enhanced. The result of the experiments show that the modified UFM may keep rejection above 97% and its water flux can be reached at about 219.1 L/(m2&middot;h) under pressure of 1 bar if 0.4 wt% of nano-GO was added. Additionally, the nano-GO can increase the flux recovery radio (FRR) of the membranes, and the maximum FRR was observed as 74.4% if 0.3 wt% of nano-GO was appended.

THERMODYNAMIC ANALYSIS OF A MEMBRANE-FORMING SYSTEM COMPOSED OF POLYSULFONE-SOLVENT-SULFURIC ACID SOLUTION

1 INTRODUCTIONSince the invention of asymmetric membrane by Loeb and Sourirajan [1],membraneseparation processes have attracted considerable commercial interests.L-S membranesare generally prepared by phase inversion techniques [2].The thermodynamic and kine-tic analyses of these processes could be expressed by means of semiempiricalmathematical models.Such thermodynamic work involves the construction of a com-plete phase diagram for the membrane formation system and the membrane structure.

Selective swelling of polysulfone/poly(ethylene glycol) block copolymer towards fouling-resistant ultrafiltration membranes

Fouling resistance of ultrafiltration(UF) membranes is critical for their long-term usages in terms of stable performance, so convenient approaches to prepare fouling-resistant membranes are always anticipated. Herein, we demonstrate the facile fabrication of antifouling polysulfone-block-poly(ethylene glycol)(PSF-b-PEG, SFEG)composite membranes. SFEG layer was coated onto macroporous supports and cavitated by immerging them in acetone/n-propanol following the mechanism of selective swelling induced pore generation. Thus-produced SFEG membranes possessed high permeance and excellent mechanical strength. Meanwhile, the structures and separation performances of the SFEG layers can be continuously tuned through simply changing swelling durations. More importantly, the hydrophilic PEG chains were spontaneously enriched onto the pore walls through swelling treatment, endowing intrinsic antifouling property to the SFEG membranes. Bovine serum albumin(BSA)/humic acid(HA) fouling tests proved the prominent fouling resistance of SFEG membranes, and the fouling resistance is expected to be long-standing because of the firm connection between PEG chains and PSF matrix by covalent bonding.

Preparation of Polysulfone-supported Phosphoramidic Acid Type Chelate Membrane and Its Sorption Properties for Ag^+

A blending chelate filter membrane with high chelate capacity for Ag + has been prepared by blending of phosphoramidic acid resin and polysulfone. The major parameters influencing structure of the chelate filter membranes such as the blending ratio, phosphoramidic acid resin grain size and temperature of casting solution have been studied. The relationship among the chelate amount of Ag +, pH value, Ag + concentration and phosphoramidic acid resin grain diameter were examined. The chelate filter membrane had a capacity of 1 438 μg/cm 2 for Ag + under appropriate conditions. Sorption isotherm of Ag + could be expressed with the Freundlich sorption model. The dynamic chelate experiments proved that the sorption and desorption of membranes could be realized simultaneously for Ag +.