Electrochemical wet-spinning process for fabricating strong PAN fibers via an in situ induced plasticizing effect

In Situ transformed carbon fibers/Al2O3 ceramic matrix nanocomposites with Cao–MgO–SiO2 sintering agent were prepared by hot-pressed sintering technology in vacuum. In the sintering process, pre-oxidized polyacrylonitrile fibers (below named as pre-oxidized PAN fibers) were used as the precursors of In Situ transformed carbon fibers. The micro/nanostructure of composites and interface between In Situ transformed carbon fibers and matrix were investigated, as well as the properties of composites. The results showed that the composites could be sintered well at a relatively low temperature of 1650 °C. During the sintering, the precursors, pre-oxidized PAN fibers, were In Situ transformed into carbon fibers, and the In Situ transformed carbon fibers had the graphitelike structure along the fiber axial direction. The carbon atoms arrangement in the surface layer of the fiber was more orderly than the core. A typical diffraction peak of carbon fiber at 26°, which corresponded to the (002) crystal plane, was observed, and the inter-planar spacing was approximately 0.34 nm. The CaO–MgO–SiO2 sintering agent formed MgAl2O4 and CaAl2Si2O8 phases in the interface between In Situ transformed carbon fibers and matrix, therefore improving the interface bonding, and thereby modifying the mechanical properties of the composites.

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Effects of kinetics coefficients on ternary phase separation during the wet spinning process

Journal of Applied Polymer Science ◽

10.1002/app.36478 ◽

2012 ◽

Vol 125 (5) ◽

pp. 3630-3637 ◽

Cited By ~ 4

Author(s):

Yu Han ◽

Jun Wang ◽

Hongdong Zhang

Keyword(s):

Phase Separation ◽

Ternary Phase ◽

Wet Spinning ◽

Spinning Process

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Tough synthetic spider-silk fibers obtained by titanium dioxide incorporation and formaldehyde cross-linking in a simple wet-spinning process

Biochimie ◽

10.1016/j.biochi.2020.05.003 ◽

2020 ◽

Vol 175 ◽

pp. 77-84

Author(s):

Hongnian Zhu ◽

Yuan Sun ◽

Tuo Yi ◽

Suyang Wang ◽

Junpeng Mi ◽

...

Keyword(s):

Titanium Dioxide ◽

Spider Silk ◽

Wet Spinning ◽

Cross Linking ◽

Silk Fibers ◽

Spinning Process

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Effect of coagulation bath parameters on the morphology and absorption behavior of a skin–core filament based on biomedical polyurethane and native silk fibroin microparticles

Textile Research Journal ◽

10.1177/0040517519870318 ◽

2019 ◽

Vol 90 (3-4) ◽

pp. 460-468 ◽

Cited By ~ 2

Author(s):

Yan Zhuang ◽

Han Wang ◽

Linfeng Wang ◽

Changjun Liu ◽

Yuan Xu ◽

...

Keyword(s):

Drug Release ◽

Water Absorption ◽

Silk Fibroin ◽

Controlled Drug Release ◽

Coagulation Bath ◽

Wet Spinning ◽

Electron Microscopy Analysis ◽

Potential Applications ◽

Spinning Process ◽

Biomedical Polyurethane

This study investigates the effect of the constituents and temperature of a coagulation bath on the morphology and water absorption behavior of a skin–core filament, which has potential application in the field of controlled drug release, based on biomedical polyurethane (BPU) and native silk fibroin microparticles (NSFPs). BPU solution and BPU/NSFP blend solution were extruded from the cortex and core channel of a coaxial double injector into a coagulation bath with different constituents and at different temperatures to form filaments. Scanning electron microscopy analysis of the skin–core filament prepared by wet-spinning revealed that the addition of ethanol decreased the exchange speed between the solvent and non-solvent and led to the formation of micropores on the surface. Meanwhile, the interface between the cortex and core became pronounced and the water absorption capability of the filament decreased with increasing ethanol concentration in the coagulation bath. The high temperature of the coagulation bath also improved the exchange speed between the solvent and non-solvent; however, its effect on the morphology of the filament was weak. Thus, a skin–core filament with different morphologies and water absorption behaviors was fabricated by controlling the constituents and temperature of the coagulation bath during the wet-spinning process. This skin–core filament has potential applications in controlled drug release.

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The Preparation and Characterization of Polyacrylonitrile-Polyaniline (PAN/PANI) Fibers

Materials ◽

10.3390/ma12040664 ◽

2019 ◽

Vol 12 (4) ◽

pp. 664 ◽

Cited By ~ 13

Author(s):

Iwona Karbownik ◽

Olga Rac-Rumijowska ◽

Marta Fiedot-Toboła ◽

Tomasz Rybicki ◽

Helena Teterycz

Keyword(s):

Specific Resistance ◽

Strong Interactions ◽

Mechanical Parameters ◽

Dsc Analysis ◽

Scanning Calorimetry ◽

X Ray ◽

Strength Tests ◽

Pan Fibers

The paper presents a method of modifying polyacrylonitrile (PAN) fibers using polyaniline (PANI). The PAN fibers were doped with polyaniline that was obtained in two different ways. The first consisted of doping a spinning solution with polyaniline that was synthesized in an aqueous solution (PAN/PANI blended), and the second involved the synthesis of polyaniline directly in the spinning solution (PAN/PANI in situ). The obtained fibers were characterized by the methods: X-ray powder diffraction (XRD), scanning electron microscope (SEM), fourier-transform infrared spectroscopy (FTIR), thermogravimetry (TG) and differential scanning calorimetry (DSC). Analysis of the results showed strong interactions between the nitrile groups of polyacrylonitrile and polyaniline in the PAN/PANI in situ fibers. The results of mechanical strength tests indicated that the performance of the PAN/PANI mixture significantly improved the mechanical parameters of polyaniline, although these fibers had a weaker strength than the unmodified PAN fibers. The fibers obtained as a result of the addition of PANI to PAN were dielectric, whereas the PANI-synthesized in situ were characterized by a mass-specific resistance of 5.47 kΩg/cm2.

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