Papers by Keyword: Composite Fiber

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: The present of this study aims to the use of carboxymethyl cellulose (CMC) improving the ability of fiber in the dyeing process. Carboxymethyl cellulose was synthesized from cellulose of banana leaves by esterification method. The effect of carboxymethyl cellulose contents on the structure, thermal properties and dye absorption were also investigated. Then, the CMC/PP composite fibers were obtained from single screw extruder at various contents of CMC (1wt%, 3wt% and 5wt%). The results from XRD showed that CMC were good compatibility with PP composite fibers. The results of thermal analysis showed that the incorporation of CMC into PP did not affect the melt temperature of the composite fibers. After dyeing, the dye however was absorbed by the CMC/PP fibers more than the pristine PP fibers. The results of absorption of dye on the CMC/PP fibers from spectrophotometer showed that dye absorbability were significantly increased with CMC contents.

Abstract: Muti-wall carbon nanotubes (MWCNTs) were functionalized by grafting polyimide (PI) on their surface via Friedel-Crafts acylation. The functionalized MWCNTs (f-MWCNTs) showd less damages than unfunctionalized ones. The partially imidized polyamide acid as-spun fibers containing f-MWCNTs were prepared by wet spinning, and the final PI/f-MWCNTs composite fibers were obtained by heat treatment. The tensile strength of the PI based composite fiber containing 1.0 wt% f-MWCNTs was 818.3 MPa and the Young’s modulus was 9.26 GPa, which were about 81% and 88% higher than those of pure PI fiber, respectively. Besides, the thermal stability of PI/f-MWCNTs composite fibers was obviously improved.

Abstract: Carbon nanotube (CNT) is a new type of nanoscale materials, which has excellent adsorption and mechanical properties. In this paper, carbon nanotubes were added in the regenerated silk fibroin solution to get CNTs/silk fibroin composite fiber, which had more excellent mechanical property than the regenerated fibroin fiber. The results indicate that the optimum preparation conditions are summed up as follows: silk fibroin concentration 35%, spinning temperature 40^oC, carbon nanotube mass fraction 1.0% and the longest storage time less than 7 days. The mechanical property of regenerated fibroin fiber which added with carbon nanotubes is obviously improved.

Abstract: To prepare a kind of high performance fiber, Single-walled carbon nanotubes (SWNTs) are used as a filler to produce SWNTs/cellulose composite fibers using ionic liquid as solvent. The thermal properties, mechanical properties and structure of the composite fibers are investigated. The WAXD measurements show that SWNTs/cellulose composite fibers are cellulose Ⅱcrystal structure. The results obtained from thermal gravimetric analysis indicate that the addition of low nanotubes amounts leads to an increase in the degrade temperature. The tensile mechanical properties show that initial modulus and tensile strength considerably increase in the presence of nanotubes with a maximum for 77.8% and 27.2%.

Abstract: The MWNTs-OH/PET composite fibers were prepared by the masterbatch melt blending spinning drawing one-step process (FDY), and the structure and properties of different contents of MWNTs-OH of the PET FDY fiber were studied. The results showed that the interaction between MWNTs-OH and PET matrix was enhanced after the modification of terephthalic acid (TPA), resulting in the improved interface compatibility. Also, the crystallinity of the composite fibers was raised 7% after the addition of modified MWNTs-OH. The fracture strength of composite fibers had firstly increased and then decreased with increasing of the content of MWNTs-OH, the strength of the composite fiber was largely improved by 60.5% with 0.2% (wt) of TPA/MWNTs-OH.

Abstract: In this paper,antistatic property of PAN/PANI composite fiber was studied through the grafted polymerization of Polyacrylonitrile and Polyaniline (PANI). The preconditioning and the dosage of ANI influenced on the rate of bodyweight gain, breaking strength and tensile rate,mass specific resistance of the composite fiber were discussed. The mass specific resistance of conventional polyacrylonitrile fiber is 1011Ω•cm,the mass specific resistance of PAN/PANI composite fiber could be reduced to 106-108Ω•cm. It could prove that the antistatic property of PAN fiber has been greatly improved by PANI.

Abstract: In this study, the biodegradable composite fiber contained different ratios of the compound antihypertensive drugs were electrospun.The morphology, chemical components, heat stability of the composite fibers were investigated.The results showed the diameters of the composite fibers decreased and their distributions tended to be much evener with the increase of the compound antihypertensive drugs content. Fourier Transform Infrared (FT-IR) showed the chemical components of the compound antihypertensive drugs had not changed when it was electrospun into the composite fibers. DSC results showed that the drugs lost their intrinsic crystallization and existed in amorphous state in the composite fibers and the heat stability of the composite were better than the pure drug.

Abstract: In fiber melt spinning, a bunch of polymer melt filaments are continuously drawn and simultaneously cooled with air in order to obtain solidified yarns, which later compose the synthetic fiber in the bobbin. Melt spinning is a basic non-isothermal operation in the production of synthetic fibers, and the velocity and temperature fields in the filaments can be useful to control the quality of the final product. Therefore, the research of the temperature and the speed in the spinning path will be very important. Based on the theory of melt rheology, the co-extrusion morphology and performance of polymer melts PA6 /PET which extrude from circular spinning porous are simulated using finite element method. The effects of the fluid flux ration、cooling air temperature and winding speed on co-extrusion fiber interface and spinning process temperature are analyzed. And the simulated results show that the interfacial offset increases with the increase of the flow rate ratio of two polymers; changing the cooling air temperature, the temperature distribution has the same trend; low winding speed is conducive to the convergence of stretching rate. The simulated results can dynamically and quantitatively reflect the melt flow process, and these results can make guiding sense to engineering application.

Abstract: Alkali was used to extract collagen from chrome shavings. Grafting modification of collagen was carried out with acrylic ester as grafting monomers. The structure of the product was characterized using infrared spectroscopy. Spinning liquid was prepared with collagen and PVA(polyvinyl alcohol). Collagen /PVA composite fiber could be produced by wet spinning. The results showed that the optimal conditions of collagen grafting reaction were as follows: the dosage of modified monomers was 30% of collagen (mass fraction), the addition of emulsifier was 10% of butyl acrylate (mass fraction), reaction time was 2h and reaction temperature was 70°C. The collagen composite fiber had a strength of 3.65 cN/dtex and a elongation of 19%. The composite fiber had certain spinnability.