Polysulfone Hollow Fiber Research Articles

Properties of Polysulfone Hollow Fiber Membranes Depending on the Method of the Spinning Solution Preparing

The spinning solution properties (viscosity, chemical composition) can be varied depending on the method of its preparation. These variations might cause changes in the thermodynamics and kinetics of the phase separation process during the membrane formation. In this work, the influence of various modes of spinning solution preparation on the morphology, geometric and gas transport properties of the resulting polysulfone (PSf) hollow fiber membranes was investigated. The differences in methods of solution preparation were the temperature and time of stirring. It was found that with the transition to the lower-temperature stirring of the spinning solution the outer diameter and wall thickness of the fiber increase, and the thickness of the selective layer decreases. The highest ideal selectivity values are observed with the solution stirring for 5 hours at temperature 120 °С (3.1 for pair He/CO2). The maximum values of the gas permeability are achieved in the mode of the solution stirring for 24 hours at temperature 50 °C (P/l (He) = 201 m3/( m2∙h∙atm); P/l (CO2) = 83 m3/( m2∙h∙atm)).

An Experimental Study PVDF and PSF Hollow Fiber Membranes for Chemical Absorption Carbon Dioxide

Poly (vinylidene fluoride) (PVDF) and poly-sulfone (PSF) polymer solutions were made at a concentration of 18% by weight of the polymer as a non-soluble additive of polymer solution in 1-methyl-2-pyrrolidone (NMP) solvent. PVDF and PSF hollow fiber membranes were fabricated via the wet phase-inversion process. Fabricated membranes were characterized in terms of gas permeability, wetting resistance, water contact angle and overall porosity. In order to study the structure of the membranes made, the scanning electron microscopy images of the model (TM3000, HITACHI, Japan) were used. The morphology study indicates that the PSF membrane shows an open cross-section structure with smaller pore sizes. However, the PVDF membrane illustrates a thick sponge-like structure. The fabricated PVDF membrane shows higher wetting resistance, surface porosity, water contact angle, and N2 permeability. The performance of the produced membranes was examined for the Absorption of carbon dioxide in a gas-liquid contactor membrane through the solution of mono-ethanolamine (MEA). The results show that CO2 absorption flux of the PVDF hollow fiber membrane is higher than PSF hollow fiber membrane. The maximum CO2 absorption flux of 8.10 × 10-3 (mole/m2 s) at the liquid phase flow rate of 300 ml/min for PVDF hollow fiber membrane was achieved and also the maximum CO2 absorption flux of 6.50 × 10-3 (mole/m2 s) at the liquid phase flow rate of 300 ml/min for PSF hollow fiber membrane was obtained. It can be concluded that a porous hydrophobic hollow fiber membrane with high surface porosity and high gas permeability can be a productive alternative for CO2 absorption through gas-liquid membrane contactors.

Influence of bore fluid composition on the physiochemical properties and performance of hollow fiber membranes for ultrafiltration

Porous hollow fiber polysulfone (PSf) membranes were fabricated via a phase-inversion process and their performance during ultrafiltration (UF) was evaluated. The effects of the composition and concentration (0–50%) of different bore fluid mixtures, including N-methyl-2-pyrrolidone (NMP)/water, glycerol (G)/water, and ethylene glycol (EG)/water (in comparison with pure deionized water), on the structure, physicochemical properties, and performance of the fabricated membranes was investigated. Using these various bore fluid mixtures altered the thermodynamic and kinetic properties of the phase inversion system, and changed the morphology and structure of the fabricated membranes, especially on the lumen side. Increasing concentrations of NMP, G, and EG in the bore fluid resulted in increased pore size, porosity, and hydrophilicity. These bore fluid mixtures exhibited a strong influence on the perm-selectivity of the as-spun hollow fiber membranes. The membrane fabricated using 50% NMP/water as the bore fluid mixture exhibited the highest water flux of 166.98 LMH with a bovine serum albumin rejection rate of more than 97%. Overall, this study introduces an easy and effective way to control the structure of the membrane through bore fluid modification and shows how the inner skin layer properties can have a remarkable effect on water permeance, even in the out-in filtration test.

Improving CO2/CH4 and O2/N2 separation by using surface-modified polysulfone hollow fiber membranes

Membrane technology for industrial gas separation was begun in the 1980s and has shown significant advantages over conventional techniques such as cryogenic distillation and solvent absorption in terms of energy consumption and operational cost. The main objective of this work is to develop a simple yet effective coating technique to modify the surface properties of polysulfone (PSF) hollow fiber membranes for enhanced separation of CO2/CH4 and O2/N2. The hollow fiber membranes made of different polymer concentration (15–35 wt%) were coated with different materials (polydimethylsiloxane (PDMS) or polyether-block-amide (Pebax) or PDMS followed by Pebax) through a simple dip-coating method before subjecting to pure gases testing and instrumental characterization. Results showed that the multilayer coated membranes exhibited better performance compared to the single-layer PDMS-coated and single-layer Pebax-coated membranes. It is also found that the Pebax concentration could affect the performance of the multilayer coated membranes in which the gas permeance decreased while its selectivity decreased with increasing Pebax concentration from 1 to 3 wt.%. Further increase in Pebax concentration from 3 to 9 wt% however negatively affected selectivities as high Pebax concentration tended to cover the membrane surface with tighter polymer chain packing which led to lower free volume. Experimental results also showed that the optimized multilayer coated membrane (3 wt.% Pebax) could achieve the highest gas pair selectivity, recording 34.28 and 6.65 for CO2/CH4 and O2/N2 separation, respectively. As a comparison, the membrane coated with 1 wt% Pebax only showed selectivity of 29.47 and 6.07, respectively. The findings of this work demonstrated that multilayered coating could be performed on the outer layer of hollow fiber membranes and is not limited to the flat sheet membranes as previously reported in the literature, provided a good combination of two coating solutions were used.

One-step synthesis of zwitterionic\xa0graphene oxide nanohybrid: Application to polysulfone tight ultrafiltration hollow fiber membrane

In this paper, novel zwitterionic graphene oxide (GO) nanohybrid was synthesized using monomers [2-(Methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (SBMA) and N,N′-methylenebis(acrylamide) (MBAAm) (GO@poly(SBMA-co-MBAAm), and incorporated into polysulfone (PSF) hollow fiber membrane for the effectual rejection of dye from the wastewater. The synthesized nanohybrid was characterized using FT-IR, PXRD, TGA, EDX, TEM and zeta potential analysis. The occurrence of nanohybrid on the membrane matrix and the elemental composition were analyzed by XPS. The as-prepared tight ultrafiltration hollow fiber membrane exhibited high rejection of reactive black 5 (RB-5, 99%) and reactive orange 16 (RO-16, 74%) at a dye concentration of 10 ppm and pure water flux (PWF) of 49.6 L/m2h. Fabricated nanocomposite membranes were also studied for their efficacy in the removal of both monovalent (NaCl) and divalent salts (Na2SO4). The results revealed that the membrane possesses complete permeation to NaCl with less rejection of Na2SO4 (<5%). In addition, the nanocomposite membrane revealed outstanding antifouling performance with the flux recovery ratio (FRR) of 73% towards bovine serum albumin (BSA). Therefore, the in-house prepared novel nanocomposite membrane is a good candidate for the effective decolorization of wastewater containing dye.

Effects of Dry-Jet Wet Spinning Parameters on Properties of Polysulfone Hollow Fiber Membranes

The influence of parameters of the dry-jet wet spinning process was studied on properties of porous polysulfone hollow fiber membranes. The air gap distance, the dope extrusion pressure, bore fluid pressure and temperature were chosen as the studied parameters. Their effect on the geometric and morphological properties of membranes was investigated. The optimal parameters were revealed for the formation of polysulfone hollow fiber membranes, promising for use as porous supports of composite membranes. High gas permeability were achieved with pore sizes providing the Knudsen flow regime: carbon dioxide permeability P/l(CO2) = 48.3 m3 m–2 h–1 atm–1, and values of ideal selectivity α = 2.63 and 0.87 for He/CO2 and CO2/N2 gas pairs, respectively.

Nanofiltration thin‐film composite membrane on either the internal or the external surface of a polysulfone hollow fiber

AbstractThe inner and outer surfaces of a porous hollow fiber polysulfone support are compared as substrates for the synthesis of polyamide thin‐film composite (TFC) membranes by interfacial polymerization. While both surfaces have pores common of microfiltration membranes, the inner surface has a larger pore diameter than the outer surface (2,700 nm compared to 950 nm). The inner TFC membrane showed higher water nanofiltration permeance than the outer (2.20 ± 0.17 compared to 0.13 ± 0.03 L m−2 hr−1 bar−1). This was due to the influence of the porosity and roughness, which were different on both support surfaces. These membranes are interesting because they were synthesized in a hollow fiber support with a high membrane area per volume unit (~6,900 m2/m3) and the substrate used was commercial, which means that the TFC membrane obtained is suitable for industrial application. A mathematical simulation of the nanofiltration run with COMSOL Multiphysics 5.3 software confirmed the experimental trends observed.

ZIF-8 based polysulfone hollow fiber membranes for natural gas purification

Mixed matrix membranes (MMMs) have received worldwide attention for natural gas purification due to their superior performance in terms of permeability and selectivity. The zeolitic imidazole framework-8 (ZIF-8) blended polysulfone (PSf) membranes have been fabricated for natural gas purification. ZIF-8 was selected due to its low cost, remarkable thermal and chemical stabilities, and tunable microporous structure. The neat PSf hollow fiber membrane and mixed matrix hollow fiber membranes incorporated with the various ZIF-8 loadings up to 1.25% were fabricated. The prepared membranes were evaluated using field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), and gas separation performance. The low loading of ZIF-8 nanoparticles to the MMM improved thermal stability and glass transition temperature and yielded low surface roughness. MMMs were tested using pure gases with a significant improvement of 36% in CO2 permeability and 28% in CO2/CH4 selectivity compared to the neat membrane. However, the high ZIF-8 loading reduced the separation performances. Moreover, CO2/CH4 selectivity decreased at elevated pressure (8 and 10 bar) due to CO2-induced plasticization. Previously, the incorporation of ZIF-8 particles has primarily been subjected to the fabrication of flat sheet membranes, whereas this work focused on hollow fiber membranes which are rarely investigated. Hence, the promising results obtained at low feed pressure in this study demonstrated the potential of ZIF-8 based hollow fiber membrane for natural gas purification.

Structure and Properties of PSf Hollow Fiber Membranes with Different Molecular Weight Hyperbranched Polyester Using Pentaerythritol as Core.

A homologous series of hyperbranched polyesters (HBPEs) was successfully synthesized via an esterification reaction of 2,2-bis(methylol)propionic acid (bis-MPA) with pentaerythritol. The molecular weights of the HBPEs were 2160, 2660, 4150 and 5840 g/mol, respectively. These HBPEs were used as additives to prepare polysulfone (PSf) hollow fiber membranes via non-solvent induced phase separation. The characteristic behaviors of the casting solution were investigated, as well as the morphologies, hydrophilicity and mechanical properties of the PSf membranes. The results showed that the initial viscosities of the casting solutions were increased, and the shear-thinning phenomenon became increasingly obvious. The demixing rate first increased and then decreased when increasing the HBPE molecular weight, and the turning point was 2660 g/mol. The PSf hollow fiber membranes with different molecular weights of HBPEs had a co-existing morphology of double finger-like and sponge-like structures. The starting pure water contact angle decreased obviously, and the mechanical properties improved.

Hollow fiber-solid phase microextraction of phthalate esters from bottled water followed by flash evaporation gas chromatography-flame ionization detection

A solid phase microextraction coupled with flash evaporation gas chromatography method was applied to the determination of phthalate esters (PAEs). Polysulfone (PSF) hollow fiber at 1 cm length was employed as extraction element to adsorb PAEs directly. Predominant parameters including stirring velocity, salt concentration, extraction time and extraction temperature were optimized. PSF fiber with absorbed PAEs was put into a small sample cup. The extracted analytes were thermally desorbed at 300 °C in a pyrolyzer, and then entered into a column for separation. The linearity of the method was satisfactory over a concentration range of 2–1000 µg/L with the correlation coefficients r>0.99 for all analytes except dimethoxyethyl phthalate. The relative standard deviations for peak areas were below 9.5% (n = 6). The developed technique achieved high enrichment factors (280–9930 times) and low limits of detection (0.001–0.130 µg/L). The recoveries over the range of 87.0–117.7% were obtained by analyzing real spiked samples. The results demonstrated that this was a simple, environmentally friendly and accurate method for the determination of PAEs in bottled water samples.

Efficient removal of 2,4-dichlorophenol from contaminated water and alleviation of membrane fouling by high flux polysulfone-iron oxide/graphene oxide composite hollow fiber membranes

Phenolic compounds are the harmful water contaminants, which severely affect living beings. Therefore, it is essential to remove the phenolic compounds, e.g., 2,4-dichlorophenol (2,4-DCP) from water sources. In this study, polysulfone-iron oxide/graphene oxide composite hollow fiber membranes were fabricated, which showed oxygen-enriched functional groups and improved hydrophilicity. With 0.5 wt.% iron oxide/graphene oxide nanohybrid in polysulfone hollow fiber membranes, remarkably high pure water flux was measured (339.8 ± 9.9 L/m2h). The improved antifouling property was achieved with a flux recovery of 95.8 %. The 2,4-DCP separation efficiency was measured to be 96.5 ± 1.6 % and 70.5 ± 2.1 % from the contaminated lab water and lake water, respectively. The separation efficiency of the composite membranes remained almost the same at the 5th filtration cycle. These results indicated that the polysulfone-iron oxide/graphene oxide composite hollow fiber membranes are promising in the efficient removal of the harmful 2,4-DCP from water sources.

Low Fouling, Peptoid-Coated Polysulfone Hollow Fiber Membranes-the Effect of Grafting Density and Number of Side Chains.

The development of low fouling membranes to minimize protein adsorption has relevance in various biomedical applications. Here, electrically neutral peptoids containing 2-methoxyethyl glycine (NMEG) side chains were attached to polysulfone hollow fiber membranes via polydopamine. The number of side chains and grafting density were varied to determine the effect on coating properties and the ability to prevent fouling. NMEG peptoid coatings have high hydrophilicity compared to unmodified polysulfone membranes. The extent of biofouling was evaluated using bovine serum albumin, as well as platelet adhesion. The results suggest that both the number of side chains and grafting density play a role in the surface properties that drive biofouling. Protein adsorption decreased with increasing peptoid grafting density and is lowest above a critical grafting density specific to peptoid chain length. Our findings show that the optimization of grafting density and hydration of the surface are important factors for achieving the desired antifouling performance.

Novel PEP-PAN@PSF rods extraction of EDCs in environmental water, sediment, and fish homogenate followed by pre-column derivatization and UHPLC-MS/MS detection

In the study, novel polysulfone hollow fiber membrane (PSF) supported polar enhanced phase (PEP) particles-polyacrylonitrile (PAN) polymer thin-film rods (PEP-PAN@PSF rods) were developed for the extraction of five steroidal endocrine disrupting chemicals (EDCs) (estrone (E1), estradiol (E2), estriol (E3), ethinyloestradiol (EE2), 2-methoxyestradiol (2ME2)) and four phenolic EDCs (bisphenol A (BPA), hexestrol (HEX), diethylstilbestrol (DES), dienestrol (DE)) in environmental water, sediment, and fish muscle homogenates, followed by pre-column derivatization and ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS). The traditional preparation method for thin-film rods was improved by introducing a supporting membrane PSF between the external thin-film coating and the internal bare rod, avoiding the conventional pre-corrosion by strong acid/base. The commercial PEP prepared rods showed competitive capacity for both polar and nonpolar EDCs. In addition, pre-column derivatization with dansyl chloride (DNS-Cl) was adopted for the phenolic analytes prior to UHPLC-MS/MS detection, leading to a significant enhancement of sensitivity via analyzing the dansylated derivatives under positive electrospray ionization (ESI) mode instead of the analytes under negative ESI mode. The protocol was validated in four matrices including environmental water, sediment and two fish species. No matrix effects were observed in four matrices. The limits of detection (LODs) for the analytes were in the range of 0.002–0.072 μg L−1 for environmental water, 0.032–0.734 ng g−1 for sediment, and 0.011–0.435 ng g−1 for two fish species, respectively. Appropriate linearity was observed for all the analytes with correlation coefficients (R2) above 0.997. The intra-day trueness of the approach at low, medium and high levels was in the range of 86.6–116.1% with relative standard deviations (RSDs) lower than 15.4%. And the inter-day trueness was in the range of 84.6–114.8% with RSDs lower than 16.3%. The proposed method was successfully applied for the analysis of nine EDCs in environmental water, sediment, and fish muscle homogenates.

Effect of Temperature Exposition of Casting Solution on Properties of Polysulfone Hollow Fiber Membranes

It was shown for the first time that the conditions of thermal treatment of the casting solution significantly affect the morphology and transport properties of porous, flat, and hollow fiber polysulfone (PSf) membranes. It is ascertained that the main solution components that are subjected to thermo-oxidative destruction are the pore-forming agent polyethylene glycol (PEG) and solvent N-methyl-2-pyrrolidone (NMP). It is proved that hydroxyl groups of PEG actively react in the process of the casting solution thermo-oxidative destruction. It is shown that despite the chemical conversion taking place in the casting solution, their stability towards coagulation virtually does not change. The differences in the membrane morphology associated with the increase of thermal treatment time at 120 °C are not connected to the thermodynamic properties of the casting solutions, but with the kinetics of the phase separation. It is revealed that the change of morphology and transport properties of membranes is connected with the increase of the casting solution viscosity. The rise of solution viscosity resulted in the slowdown of the phase separation and formation of a more densely packed membrane structure with less pronounced macropores. It is determined experimentally that with the increase of casting solution thermal treatment time, the membrane selective layer thickness increases. This leads to the decrease of gas permeance and the rise of the He/CO2 selectivity for flat and hollow fiber membranes. In the case of hollow fibers, the fall of gas permeance is also connected with the appearance of the sponge-like layer at the outer surface of membranes. The increase of selectivity and decline of permeance indicates the reduction of selective layer pore size and its densification, which agrees well with the calculation results of the average membrane density. The results obtained are relevant to any polymeric casting solution containing NMP and/or PEG and treated at temperatures above 60 °C.

Optimization of pilot-scale 3-stage membrane process using asymmetric polysulfone hollow fiber membranes for production of high-purity CH4 and CO2 from crude biogas

In this work, we report on the design, construction and optimization of a pilot scale 3-stage membrane plant operated by a single compressor for production of high-purity CH4 and CO2 from crude biogas. In our previous works, we developed asymmetric polysulfone hollow fiber membranes with high CO2/CH4 separation properties and a numerical simulation program for a 3-stage membrane process for biogas separation. Herein, utilizing a pure gas permeation test, we report the effects of feed pressure and temperature on gas separation properties of the developed membrane modules. We also report the effects of various operating conditions on CH4 purity and recovery at the retentate, which were investigated using mixed gases as a function of stage-cut. Using a simulation program and the gas permeation data, we designed and constructed a 3-stage membrane plant that can treat 100 Nm3/h of crude biogas (65–75 vol% CH4, balanced CO2). It was confirmed that, in the constructed 3-stage pilot plant, the final purity and recovery ratios for CH4 and CO2 of the 3-stage membrane plant were significantly influenced by the operation conditions. Under optimized operation conditions, the 3-stage membrane plant exhibited outstanding biogas separation performance; high CH4 purity and good recovery (98.4% and 98.7%, respectively) were observed, together with high CO2 purity and recovery (97.2% and 97.0%, respectively). This study demonstrates the commercial applicability of the 3-stage membrane pilot plant using polysulfone hollow fiber membranes for simultaneous production of high purity CH4 and CO2 from crude biogas.

Single-use, single-pass tangential flow filtration using low-cost hollow fiber modules

Increasing pressures on biomanufacturing costs have led to renewed interest in the development of single-use technologies that can be readily adapted to continuous processing. The objective of this study was to use commercially available hollow fiber membranes, originally designed for high-flux hemodialysis, for single pass tangential flow filtration with high conversions. Experiments were performed with solutions of Immunoglobulin G (IgG) using polysulfone hollow fiber membrane cartridges with a surface area of 1.9 m2. The hollow fiber modules were able to provide more than 10-fold concentration of IgG in a single-pass with exit concentrations greater than 200 g/L. Stable operation was achieved during a continuous run for over a 120-h period with feed side pressure drops less than 1 kPa and transmembrane pressure drops less than 60 kPa. A single dialyzer was able to process 1.4 kg of IgG per day with a total cost of less than $0.004 per g of IgG. Flux-pressure profiles were in good qualitative agreement with a simple model accounting for concentration polarization effects and the variation of flux and pressure with axial position in the module. These results clearly demonstrate the potential of using these low-cost single-use hollow fiber modules for single-pass tangential flow filtration in continuous biomanufacturing.

Iron oxide nanoparticles improved biocompatibility and removal of middle molecule uremic toxin of polysulfone hollow fiber membranes

ABSTRACTMiddle molecule uremic toxins constitute to a quarter of uremic toxins present in human blood. In a condition where these uremic toxins accumulate in bloodstream due to renal failure, blood purification process using a high performance membrane is required. Here, we develop biocompatible mixed matrix membranes (MMMs) made up of polysulfone (PSf) and iron oxide nanoparticles (Fe2O3 NPs) with the focus to remove middle molecule uremic toxin effectively. The MMMs were evaluated in terms of their biocompatibility and separation performance. At higher Fe2O3 NPs loading, the MMM displayed a huge reduction of protein adsorption and platelet adhesion while maintaining normal blood coagulation time and acceptable complement activation. The optimized MMM exhibited high permeability (110.47 L m−2 h−1 bar−1), protein retention (99.9%) and demonstrated excellent clearance of urea (82%) and lysozyme (46.7%). The PSf/Fe2O3 MMM is proven to have promising attributes for hemodialysis application. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48234.

Effect of electric potential on the morphology and chemical composition of hollow fiber membrane surface in alkaline medium

The impact of electric potential on the dimensional characteristics and membrane surface morphology was investigated in this work. Our study samples comprise hollow fiber (HF) Polysulfone (PS) membrane. Conductive additives have been incorporated within the membrane matrix at the desired predefined concentration. The DC operated electrochemical apparatus consists of graphite anode and stainless steel cathode. The voltage and current density ranges are 2 to 10volts and 0.01 to 1.4mA/mm2 respectively. These investigations have been conducted in alkaline medium at pH=8.5. The results of this work revealed essential changes of hollow fiber (HF) dimensions, including external (DO), internal (DI) and membrane thickness (t). The maximum decrease of DO, DI, and t were 13%, 15%, and 11% respectively at 5volts. EDX analysis showed the maximum sodium ions of about 0.84% on the membrane surface at 2.5volts after 1-hour treatment.

Effects of air gap on membrane substrate properties and membrane performance for biomass processing

We studied a correlation between the membrane substrate properties and the final performance of hollow fiber thin film composite (TFC) membrane for xylose/glucose concentration and acetic acid removal. Polysulfone (PSf) hollow fiber membrane substrate was fabricated using 20 wt% PSf, 2 wt% polyvinylpyrrolidone and 78 wt% dimethylformamide via dry-wet spinning process. The air gap distance was manipulated from 6 cm to 15 cm during spinning to produce different substrate membrane properties. The molecular weight cut-off (MWCO) and porosity of the membrane substrate increased as the air gap distance increased. Membrane substrate that was spun at 6 cm air gap showed a rapid phase inversion without much chain relaxation, thus producing the smallest MWCO (8 kDa) and an average pore diameter (4.46 nm). The TFC membrane produced using this membrane substrate showed the best performance in terms of solute rejection and separation factor. The rejection for xylose, glucose and acetic acid was 91.66±0.09%, 67.28±13.97%, and 13.08±3.00%, respectively. This results in an ideal separation factor of 3.20±1.27 for acetic acid/glucose and 10.42±0.25 for acetic acid/xylose.

Preparation of pure egg albumen fiber through coaxial wet-spinning

Pure egg albumen fiber has potential applications in the food industry, biomedicine, drug-controlled release systems, and as a tissue engineering scaffold. However, this type of fiber has not been successfully prepared so far. In this study, pure egg albumen fiber was successfully prepared using the simple method of coaxial wet-spinning with a polysulfone (PSU) hollow fiber as a template. PSU solution and egg albumen solution were extruded into a coagulation bath of distilled water to fabricate egg albumen/PSU fiber, in which the egg albumen solution was wrapped up by the outside PSU layer. Continuous pure egg albumen fiber was obtained after heat treatment in hot water and removal of the PSU layer by dissolution in N, N-dimethylformamide. The prepared continuous egg albumen fiber with good gloss could be lifted along the axial direction. Scanning electron micrographs revealed a dense structure. This successful preparation of pure egg albumen fiber will enable the manufacture of egg albumen fiber composites with excellent application potential for tissue engineering scaffolds.