The index of dry‐jet wet spinning for polyacrylonitrile precursor fibers

Wang, Tai Yuan; Chang, Hsiao Chuan; Chiu, Yu‐Hui; Tsai, Jia-Lin

doi:10.1002/app.41265

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…According to the continuity of polymerization and spinning, it is generally divided into one-step and two-step methods. According to the spinning process, it is generally divided into wet spinning [11], dry spinning [12], dry-jet wet spinning [13] and melting spinning, among which dry-formed fiber structure is the tightest. The change of fineness of fibers in wet forming is small, the solvent remaining in the fibers is small, and the quality of the raw silk can be easily controlled, which results in wet forming being widely used in the spinning process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Pressures of Supercritical Carbon Dioxide on the Microstructure of PAN Fibers during the Hot-Drawing Process

et al. 2019

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The hot-drawing process of polyacrylonitrile (PAN) fibers is an important step during the production of PAN-based carbon fibers. In this study, supercritical carbon dioxide (Sc-CO2) was used as one kind of media for thermal stretching of PAN fibers to study the effect of different pressures of Sc-CO2 on crystallinity, degree of orientation and mechanical property of PAN fibers during the hot-drawing process. The changes of microstructure and mechanical properties in the PAN fibers were investigated by wide-angle X-ray diffraction, small angle X-ray scattering and monofilament strength analysis. The results showed that as the pressure increased, the crystallinity and degree of orientation of PAN fibers increased. Furthermore, when the pressure was 10 MPa, the crystallinity increased from 69.78% to 79.99%, which was the maximum crystallinity among the different pressures. However, when the pressure was further increased, the crystallinity and degree of orientation of the fibers were reduced. The test results of the mechanical properties were consistent with the trends of crystallinity and degree of orientation, showing that when the pressure was 10 MPa, the tensile strength of the fibers increased from 4.59 cN·dtex−1 to 7.06 cN·dtex−1 and the modulus increased from 101.54 cN·dtex−1 to 129.55 cN·dtex−1.

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Section: Introductionmentioning

confidence: 99%

Effect of Different Pressures of Supercritical Carbon Dioxide on the Microstructure of PAN Fibers during the Hot-Drawing Process

et al. 2019

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“…Important factors that determine the mechanical properties of dry-jet wet-spun precursor fibers are the viscosity of the spinning dope, thermodynamic affinity, and draw ratio during the spinning process, and high viscosity and draw ratio with low thermodynamic affinity resulted in better mechanical properties [76]. Post-gelation (or aging) after the spinning process in cold methanol can be another step that can be used to improve the mechanical performance of dry-jet wet-spun precursor fibers [80]. A novel wet spinning process accompanied by an electrochemical reaction was recently reported in which electrochemical oxidation by the applied electric potential was designed to induce the plasticization effect of adsorbed water, as shown in Figure 9 [81].…”

Section: Spinning Processesmentioning

confidence: 99%

Section: Spinning Processmentioning

confidence: 99%

Designing Materials and Processes for Strong Polyacrylonitrile Precursor Fibers

2021

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Although polyacrylonitrile (PAN)-based carbon fibers have been successfully commercialized owing to their excellent material properties, their actual mechanical performance is still much lower than the theoretical values. Meanwhile, there is a growing demand for the use of superior carbon fibers. As such, many studies have been conducted to improve the mechanical performance of carbon fibers. Among the various approaches, designing a strong precursor fiber with a well-developed microstructure and morphology can constitute the most effective strategy to achieve superior performance. In this review, the efforts used to modulate materials, processing, and additives to deliver strong precursor fibers were thoroughly investigated. Our work demonstrates that the design of materials and processes is a fruitful pathway for the enhancement of the mechanical performance of carbon fibers.

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Comprehensive research on the correlation between microstructure and mechanical properties of polyacrylonitrile‐based precursor fibers prepared by wet‐spinning

Liu,

Dai,

Guo

et al. 2024

J of Applied Polymer Sci

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Polyacrylonitrile (PAN)‐based precursor fibers with different mechanical properties prepared by wet‐spinning and its correlation with microstructure was researched, the primary structural factors that affecting its properties were analyzed. The tensile strength and modulus of precursor fibers increased from 4.63 cN/dtex to 9.16 cN/dtex and 99.09 cN/dtex to 168.92 cN/dtex, respectively, with the increase in crystallinity from 69.29% to 87.84% and orientation degree increased from 83.95% to 93.81%, high performance precursor fibers could be achieved by decrease in the crystallite size and interlayer spacing, these aggregation structure plays a decisive role to the mechanical properties of fibers. The integrality of aggregation structure and properties could reflected by boiling water shrinkage behavior and glass transition temperature from the side. The fracture morphology of fibers with different properties were studied by scanning electron microscope (SEM) and three fracture characteristics were observed, PF1 and PF3 presented the radial extended fracture without microfibril pull out, radial cluster fracture with the pull out of microfibril for PF2, PF4–PF6, together with the axial splitting pattern in PF6, which was revealed by microfibrils/fibrils in longitudinal and transverse combined with solution etching. Precursor fibers with less voids, without serious skin‐core, continuous arrangement, tightly stacked, well‐developed and complete oriented microfibrils/fibrils, exhibited excellent mechanical properties. Possible fracture process was given from the perspective of aggregation structure and microfibrils/fibrils, which become dominant factors determining properties of precursor fibers. Improve the performance could be achieved by regulating surface structure and cross‐sectional shape. As one of the main structural factors that determining properties, by reducing diameter could minimize the numbers and sizes of defects.

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The index of dry‐jet wet spinning for polyacrylonitrile precursor fibers

Cited by 9 publications

References 29 publications

Effect of Different Pressures of Supercritical Carbon Dioxide on the Microstructure of PAN Fibers during the Hot-Drawing Process

Effect of Different Pressures of Supercritical Carbon Dioxide on the Microstructure of PAN Fibers during the Hot-Drawing Process

Designing Materials and Processes for Strong Polyacrylonitrile Precursor Fibers

Comprehensive research on the correlation between microstructure and mechanical properties of polyacrylonitrile‐based precursor fibers prepared by wet‐spinning

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