Microstructure and Mechanical Properties of Polyacrylonitrile Precursor Fiber with Dry and Wet Drawing Process

Ahn, Hyeong Sik; Wee, Jae-Hyung; Kim, Yong Min; Yu, Woong‐Ryeol; Yeo, Sangyoung

doi:10.3390/polym13101613

Cited by 14 publications

(12 citation statements)

References 32 publications

(39 reference statements)

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“…I, II, and II in Table ). The moisture content and microstructure according to the drawing process affected the tensile behavior of the nascent fibers . The drawing ratio was not stable because the feed rate was not controlled.…”

Section: Resultsmentioning

confidence: 99%

Application of a Twin-Screw Extruder with an Ultra-High Length-to-Diameter Ratio in the Dry-Jet Wet Spinning Process of Polyacrylonitrile Nascent Fibers

Jian

Zheng

et al. 2023

Ind. Eng. Chem. Res.

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The quality of nascent fiber is the primary factor determining the performance of polyacrylonitrile (PAN)-based carbon fibers. This work presented a novel twin-screw extruder (TSE) with an ultra-high screw length-to-diameter (L/D) ratio for the dry-jet wet spinning process of high-quality PAN nascent fibers. The TSE with an ultra-high L/D ratio of up to 150 enabled the homogeneous mixing of PAN powder and dimethyl sulfoxide (DMSO), resulting in improved dope concentration of up to 30 wt %, improved molecular chain disentanglement, and reduced void formation. Orthogonal experiments were conducted to analyze the influence of dope concentration, barrel temperature, and screw speed on the properties of the PAN nascent fibers. Especially, three L/D ratios of 64, 96, and 150 were established to clarify the influence of the L/D ratio. It was found that with the increase in the L/D ratio from 64 to 150, the average tensile strength and modulus of the PAN nascent fibers were improved by 42.1 and 67.2%, respectively, and the crystallinity was increased by 45.5%. The PAN nascent fibers produced using the TSE with the ultra-high L/D ratio were found to have dense and smooth surfaces and fewer microvoid defects. It demonstrated the innovativeness and potential industrial application of the ultra-high L/D technique in the manufacturing of high-quality PAN-based carbon fibers.

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Section: Resultsmentioning

confidence: 99%

Application of a Twin-Screw Extruder with an Ultra-High Length-to-Diameter Ratio in the Dry-Jet Wet Spinning Process of Polyacrylonitrile Nascent Fibers

Jian

Zheng

et al. 2023

Ind. Eng. Chem. Res.

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“…Polyacrylonitrile fibres are used to make textiles and the majority of carbon fibres. [48,49] It appears that the substitution of DMF in the production of polyacrylonitrile fibres is not viable. The sector is prepared to provide respiratory protective equipment for workers in order to comply with the new exposure limits.…”

Section: Dipolar Aprotic Solvent Health Hazardsmentioning

confidence: 99%

N,N‐Dimethyl Formamide European Restriction Demands Solvent Substitution in Research and Development

Sherwood,

Albericio,

de la Torre

2024

ChemSusChem

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As of December 2023, the use of common solvent N,N‐dimethyl formamide (DMF) will be restricted in the European Union because of its reproductive health hazard. Industrial facilities must comply with stricter exposure limits, and researchers are recommended to find alternative solvents. Here we explain the restrictions on DMF, which disciplines are affected, and how to substitute DMF to keep research and development commercially relevant.

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“…P (AN-MA) precursor fibers were manufactured through spinning, washing, and stretching processes. A dope solution with a concentration of 25 wt% was prepared and spun, as suggested in previous fiber spinning research [8,22]. DMSO was used for both the dope solvent and the coagulation bath, and the fiber formation conditions were controlled using distilled water and DMSO at a ratio of 1:1 for the coagulation bath.…”

Section: Fiber Spinning and Drawingmentioning

confidence: 99%

“…There has been little research on the drawing process, especially in the PAN precursor fiber manufacturing process, which forms a structure by dispersion and diffusion of solvent in the spinning process, washing and rinsing, and the drawing process. Few studies have looked at the microstructure involved, although studies on the internal structural changes and physical property changes that occur during the stretching process have been conducted [22].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Analysis of Drawing Effect and Mechanical Properties of Polyacrylonitrile Precursor Fiber According to Molecular Weight

et al. 2022

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Polyacrylonitrile (PAN) fiber is the most widely used carbon fiber precursor, and methyl acrylate (MA) copolymer is widely used for research and commercial purposes. The properties of P (AN-MA) fibers improve increasingly as the molecular weight increases, but high-molecular-weight materials have some limitations with respect to the manufacturing process. In this study, P (AN-MA) precursor fibers of different molecular weights were prepared and analyzed to identify an efficient carbon fiber precursor manufacturing process. The effects of the molecular weight of P (AN-MA) on its crystallinity and void structure were examined, and precursor fiber content and process optimizations with respect to molecular weight were conducted. The mechanical properties of high-molecular-weight P (AN-MA) were good, but the internal structure of the high-molecular-weight material was not the best because of differences in molecular entanglement and mobility. The structural advantages of a relatively low molecular weight were confirmed. The findings of this study can help in the manufacturing of precursor fibers and carbon fibers with improved properties.

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Microstructure and Mechanical Properties of Polyacrylonitrile Precursor Fiber with Dry and Wet Drawing Process

Cited by 14 publications

References 32 publications

Application of a Twin-Screw Extruder with an Ultra-High Length-to-Diameter Ratio in the Dry-Jet Wet Spinning Process of Polyacrylonitrile Nascent Fibers

Application of a Twin-Screw Extruder with an Ultra-High Length-to-Diameter Ratio in the Dry-Jet Wet Spinning Process of Polyacrylonitrile Nascent Fibers

N,N‐Dimethyl Formamide European Restriction Demands Solvent Substitution in Research and Development

Microstructure Analysis of Drawing Effect and Mechanical Properties of Polyacrylonitrile Precursor Fiber According to Molecular Weight

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