Papers by Keyword: Wet Spinning

Abstract: Graphene, a 2D carbon allotrope with remarkable characteristics like high conductivity, large surface area has shown potential as a good candidate for high-performance supercapacitors. The processability of its derivative, graphene oxide, into fibers enables the development of miniaturized wearable energy storage devices. However, the synthesis of pure graphene oxide and its subsequent reduction to restore conductivity remain a focus for research. Herein, we employ the improved Hummers’ method for graphene oxide synthesis, followed by meticulous washing to remove residual acids. The obtained graphene oxide was then transformed into conductive graphene fibers through a wet-spinning and hydroiodic acid (HI) reduction process. The resulting fibers showed a high areal capacitance of 175 mA cm⁻² in a three-electrode system. When assembled into a flexible supercapacitor, these fibers delivered an energy density of 8 μWh cm⁻² and areal capacitance of 60 mA cm⁻². This study demonstrates the potential of our strategy for fabricating fiber-based energy storage devices based on graphene.

Abstract: In this paper, cellulose solution was obtained by dissolving cellulose in CO₂ switchable solvent, and the CNF spinning solution was prepared by mixing cellulose solution with cellulose nanofibrils (CNF) by physical blending. CNF reinforced all-cellulose composite fibers were prepared by wet-spinning. The spinning solution with good dispersion of CNF can be obtained. The rheological property test showed that the solution has spinnability. The composite fibers were subsequently prepared by wet-spinning. The structure and properties of the composite fibers were analyzed by FT-IR, XRD, SEM, TGA, and mechanical properties testing. The results showed that the chemical structure of the composite fiber was the same as that of cellulose, but the aggregate structure became amorphous, which resulted in deceased thermal stability. The composite fibers had dense and solid structure without any cavity. The mechanical strength of the composite fiber was upto 1.12cN/dtex.

Abstract: A polyamide acid (PAA) based on diamine 4,4'-bis (4-aminophenoxy) diphenyl and 1,3-bis (3',4-dicarboxyphenoxy) benzene dianhydride was synthesized. PAA fibers were obtained by wet spinning. Then, these fibers were converted into polyimide by thermal imidization. Dependence of the structure and properties of fibers on the die drawing and the composition of the coagulation bath was studied. It is shown that the composition of the coagulation bath has a significant effect on the morphology and mechanical properties of polyimide (PI) fibers. To obtain defect-free fibers, a coagulation bath consisting of ethylene glycol/ethanol at 50/50 vol. % was found to be optimal. An increase in the die drawing of fibers from 1 to 2 times leads to an increase in tensile strength and strain at break of the polyimide fibers.

Abstract: Copolymerized poly (m-phenylene isophthalamide) (co-PMIA) fibers with excellent thermal stability and good mechanical properties were developed via solution polycondensation process based on m-phenylenediamine (MPD), isophthaloyl dichloride (IPC), and 3,4′-oxydianiline (3,4′-ODA). Effects of the ether moiety on the structure and properties of the copolymers were investigated. A series of co-PMIA nascent fibers were produced using wet-spinning method. The coagulation process to form co-PMIA nascent fibers were studied by examination of SEM and strength tester. The co-PMIA nascent fibers with the MPD/3,4′-ODA molar ratio of 8:2 showed an optimum dye uptake. Keywords: Copolymerization; High performance material; Wet spinning; Dyeability.

Abstract: Hydrophobic textile is a type of smart fabrics. Some of it are commonly coated with small particles and finally treated by water repellent agent in terms of acquiring its hydrophobic property. This research describes how hydrophobic textile are formed from its initial form of fabrics and even yarn, which are fibers. Synthesis process was commenced through wet spinning of viscose rayon mixed with nanorod silica which has been formerly produced with sol gel method. These fibers were then coated with chitosan and dried out by vacuum instrument. Scanning Electron Microscopy (SEM) results showed that nanorod silica were well attached on the fibers. Followed by Energy Dispersive Spectroscopy (EDS) mapping characterization, silica particles were moderately dispersed on its surface, performing roughness and creating hydrophobic effect. In addition, several characterization methods correlated to water absorption of the fibers were conducted. Fibers swelling percentage decreased from 50.2% to 17.13%, while moisture regain (MR) number also decreased from 14.28 to 10.72.

Abstract: Cellulose is a good bio-based material for rich resources and recyclability. Paraffin is widely used in the field of energy storage and temperature regulation due to its excellent heat storage properties and mature preparation technology. In this paper, the cellulose fibers with energy storage and temperature regulation were prepared by wet spinning process using paraffin as phase change material. Field Emission Scanning Electron Microscope (FE-SEM), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA) were utilized to characterize the morphology structure, crystalline properties, phase transition properties and heat resistance of fibers and so on. The results showed that the fiber surface without holes and paraffin was uniformly distributed in the cellulose matrix, and paraffin was not easily overflow during the process of phase change. Paraffin and cellulose substrate had good compatibility due to the interaction of hydrogen bonding, and 30% of paraffin did not cause a significant impact on the degree of crystallinity and thermal stability of cellulose fibers. Enthalpy of the resultant functional fibers could reach 27.44 J/g, and the thermal decomposition temperature was over 300 °C. The fibers possessed the phase change ability and certain mechanical properties. Furthermore, it was found that the fibers still had good resistance to washing under extreme conditions.

Abstract: A polyimide fiber derived from benzophenone-3,3’,4,4’-tetracarboxylic acid dianhydride (BTDA), toluene diisocyanate (TDI) and 4,4’-methylenebis (phenyl isocyanate) (MDI) has been prepared by wet spinning. The chemical structure of the synthetic polyimide was characterized by Fourier transform infrared (FTIR) spectrometry. Also, field emission scanning electron microscope (FESEM) was used to observe the surface and cross-section morphologies of the resulting fibers. In addition, the obtained fibers possessed good thermal and thermo-oxidative stabilities with the initial degradation temperatures in air and nitrogen 499°C and 527°C, respectively. In order to obtain the optimized processing conditions, orthogonal design was applied. An optimal parameter combination was determined which leaded to maximum of tensile strength . As evidenced by variance analysis, the tensile strength of resultant fibers was influenced by negative draw ratio of spinneret remarkably making it the significant factor.

Abstract: Modified polyurethane fiber was prepared by wet spinning method, Different amount of chitosan powder that dissolving in polyurethane solution to get spinning solution were examined. This materials presents excellent adsorption capacity on Pb²⁺. the absorption type on Pb²⁺ of this modified fibers was monomolecular. The modified fibers get the maximum adsorption 25.53mg/g when the quality ratio of chitosan and polyurethane was 1:1 under the condition of 30°C and pH 6.

Abstract: protein was extracted from Antarctic krill (AK), then blended with sodium alginate (SA) , prepare the spinning solution, the rheological properties of spinning solution were studied by Brookfield DV-C digital viscosimeter. AKP/SA fibers were prepared via wet spinning with CaCl₂ and PEG as coagulator .The morphology, tensile strength and thermal property of AKP/SA fibers were characterized by polarized light microscopy, monofilament strength tester and thermal gravimetric analysis (TGA) instrument. The result shows that the shear viscosities of spinning solution decrease with the increasing of shear rate and decreasing of concentration. the optimal Preparation Process of AKP/SA fibers were 5% concentration of SA, proportion of 1: 9 for AKP solution to SA solution, and proportion of 5:1 for CaCl₂ to PEG. The cross-section of AKP/SA fiber is a jagged shape. Thermal property of AKP/SA fibers is similar to SA fibers.

Abstract: The composite conductive fibers based on poly (3,4-ethylenedioxythiophene)-polystyrene sulfonic acid (PEDOT-PSS) blended with polyacrylonitrile (PAN) were prepared via a conventional wet spinning process. The influences of PEDOT-PSS content on the electrical conductivity, thermal stability and mechanical properties of the composite fibers were investigated. The fiber with 1.83 wt% PEDOT-PSS showed a conductivity of 5.0 S/cm. The breaking strength of the fibers was in the range of 0.36-0.60 cN/dtex. The thermal stability of the PEDOT-PSS/PAN composite fibers was similar to but a slightly lower than the pure PAN. The XRD results revealed that both pure PAN and the PEDOT-PSS/PAN composite fibers were amorphous phase, and the crystallization of the latter was lower than the former.