New insights into the radial structural differences of polyacrylonitrile fibres during thermal stabilization by the synchronous processing adjustment of time and temperature

Chen, Liang; Chen, Jing; Shen, Zhigang; Liu, Jie; Wang, Xiaoxu

doi:10.1039/d2ra01786e

Cited by 3 publications

(1 citation statement)

References 39 publications

(55 reference statements)

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“…Define W as the heat treatment work subjected to continuous heat treatment of fibers, which is the integration of preoxidation temperature and time, 19 calculated using Equation (1). Li et al 20 found that the degree of fiber preoxidation is subject to a time-temperature effect, fibers with similar degree of preoxidation could be prepared at low temperature for a long time or at high temperature for a short time.…”

Section: Preparation Of Pan Preoxidized Fibersmentioning

confidence: 99%

Effect of oxygen content on the preoxidation structure of polyacrylonitrile fibers

Zhou

Lan

Xiao

et al. 2023

J of Applied Polymer Sci

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During the preoxidation process of polyacrylonitrile (PAN) fibers, the diffusion behavior of oxygen from skin to core can lead to the formation of radially uneven structure of fibers, which affects the mechanical properties of subsequent PAN carbon fibers. Here we examine the effect of oxygen content on the subsequent structure evolution of fibers with different preoxidation structure, by using 13 C Solid-state NMR analysis ( 13 C-NMR), optical density characterization, differential scanning calorimetry analysis, and thermalgravimetric analysis. The results show that increasing the oxygen content during the subsequent heat treatment can effectively reduce the radial structure difference of fiber, its efficiency is related to the preoxidation degree of fibers. For fibers with lower preoxidation degree, namely less heat treatment work (W), the radial structure difference disappears when the oxygen content reaches 29%. Further study shows that the improvement of radial structure of preoxidized fibers improved fiber thermal stability, its efficiency is also related to the W of fibers; when the W of fibers is 5, the carbonization yield at 800 C increased from 56.79% to 62.61%, which is 10.25% higher; when the W of fibers is 20, under the same oxygen content range, the carbonization yield increased from 68.97% to 69.60%, which is only 0.913% higher.

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Section: Preparation Of Pan Preoxidized Fibersmentioning

confidence: 99%

Effect of oxygen content on the preoxidation structure of polyacrylonitrile fibers

Zhou

Lan

Xiao

et al. 2023

J of Applied Polymer Sci

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Oxygenated moiety enhanced thermal stabilization, mechanical, and thermomechanical performance of polyacrylonitrile/single wall carbon nanotubes films

Chandel,

Kapurderiya,

Kanse

et al. 2024

Polymer Composites

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Thermo‐oxidative stabilization of polyacrylonitrile (PAN)‐copolymer and PAN/single‐walled carbon nanotube (SWCNT) composite films were studied in the presence of oxygenated entities which may act as an internal oxygen supplier. The oxygenated moiety exhibited dual behavior, enhancing the stabilization efficiency of PAN while also improving the dispersion of SWCNT. The addition of oxygenated moiety treated SWCNT to PAN resulted in a significant reduction in activation energy from 118 kJ/mol to 99 kJ/mol, owing to a more stable oxidation reaction. Thermogravimetric analysis showed weight loss due to stabilization, and polymer chain degradation was lower in treated SWCNT composite films, resulting in an approximate 6% increase in residual weight. Mechanical testing showed a significant increase in tensile strength to 54.15 MPa and tensile modulus to 2.53 GPa with elongation at break of 13.2%, which is attributed to the enhanced interfacial shear strength resulting from the improved dispersion of oxygenated moiety‐treated nanotubes. Furthermore, thermomechanical analysis studies showed improvement in dimension stability with oxygenated moiety treated SWCNT composite films, attributed to better dispersion and increased interfacial strength between the polymer and filler.Highlights Oxygenated entities stabilize PAN and improve SWCNT dispersion. Activation energy was reduced from 118 to 99 kJ/mol with Tween‐80. Residual weight increased by 6% with treated SWCNT in TGA. Improved tensile strength (54.14 MPa), modulus (2.53 GPa) with modified SWCNT. Dimension stability is enhanced by interfacial strength with modified SWCNT.

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Direct measurement of microfibril structures in polyacrylonitrile fibers during carbon fiber manufacturing process

Gao,

Wang,

Zhou

et al. 2024

Iran Polym J

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New insights into the radial structural differences of polyacrylonitrile fibres during thermal stabilization by the synchronous processing adjustment of time and temperature

Abstract: PAN chains in skin regions of the stabilized fibres are highly different from those in the core regions. Although stabilized PAN fibres may have equal densities, the performances of the resultant carbon fibres may be disparate.

Cited by 3 publications

References 39 publications

Effect of oxygen content on the preoxidation structure of polyacrylonitrile fibers

Effect of oxygen content on the preoxidation structure of polyacrylonitrile fibers

Oxygenated moiety enhanced thermal stabilization, mechanical, and thermomechanical performance of polyacrylonitrile/single wall carbon nanotubes films

Direct measurement of microfibril structures in polyacrylonitrile fibers during carbon fiber manufacturing process

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