Polyacrylonitrile Based Carbon Fibers Obtained from a Melt Spun Route

Wang, Yan Zhi; Wang, Shu Gui; Liu, Jia Lin

doi:10.4028/www.scientific.net/kem.575-576.151

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…Carbon fibers (CFs), as one of the new materials of lightweight high-performance fibers for composites, are defined as fibers containing at least 92 wt % carbon [1,2]. Owing to the advantages of excellent tensile properties, low densities, and high thermal and chemical stabilities, CFs are widely used in various fields [3,4,5,6,7]. CFs are produced from many different precursors, such as polyacrylonitrile (PAN), mesophase pitch, rayon, etc.…”

Section: Introductionmentioning

confidence: 99%

Study on the Changes of Structures and Properties of PAN Fibers during the Cyclic Reaction in Supercritical Carbon Dioxide

et al. 2019

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Thermal pre-oxidation of polyacrylonitrile (PAN) fibers is a time-consuming and energy-consuming step in the production of PAN-based carbon fibers. In this paper, the effect of temperature on the structures and properties of PAN fibers cyclized in the supercritical carbon dioxide (Sc-CO2) medium was studied. The thermal behaviors of the PAN fibers were investigated by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). The cyclization reaction was sensitive to the heating temperature and gas atmosphere. The FT-IR results of the PAN fibers treated in the Sc-CO2 confirmed that the degree of cyclization increased with the increase of the cyclization temperature. Compared with the PAN fibers treated in the air, the PAN fibers treated in the Sc-CO2 showed a higher degree of cyclization even at the same temperature. These findings might be related to the osmotic action of Sc-CO2 causing the fibers to be further arranged in a regular manner, which was favorable for the cyclization reaction. Moreover, as one kind of high diffusion and high heat transfer media, the heat release during the cyclization of PAN fibers could be quickly removed by Sc-CO2, which achieved the progress of the rapid-entry cyclization reaction.

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Section: Introductionmentioning

confidence: 99%

Study on the Changes of Structures and Properties of PAN Fibers during the Cyclic Reaction in Supercritical Carbon Dioxide

et al. 2019

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“…The third group of methods for implementing TOS to melt-spun PAN without melting the fiber includes additional chemical modification of polymer. Aiming for this, a third comonomer with a photosensitive functional group is introduced at the stage of synthesis into the melt-processable AN copolymer with melting point below the onset of TOS [ 63 , 177 , 178 , 179 , 180 ]. The first information about the possibility of crosslinking of AN copolymers containing an embedded photosensitive component appeared in the early 2000s [ 72 , 181 , 182 ].…”

Section: How To Conduct Stabilization Of the Fiber Without Its Meltin...mentioning

confidence: 99%

“…Both the composition of terpolymer and the method of its synthesis were changed in [ 180 ]. Suspension polymerization in a mixture of DMSO and water was used instead of emulsion polymerization.…”

Section: How To Conduct Stabilization Of the Fiber Without Its Meltin...mentioning

confidence: 99%

Melt-Spinnable Polyacrylonitrile—An Alternative Carbon Fiber Precursor

et al. 2022

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The review summarizes recent advances in the production of carbon fiber precursors based on melt-spun acrylonitrile copolymers. Approaches to decrease the melting point of polyacrylonitrile and acrylonitrile copolymers are analyzed, including copolymerization with inert comonomers, plasticization by various solvents and additives, among them the eco-friendly ways to use the carbon dioxide and ionic liquids. The methods for preliminary modification of precursors that provides the thermal oxidative stabilization of the fibers without their melting and the reduction in the stabilization duration without the loss of the mechanical characteristics of the fibers are discussed. Special attention is paid to different ways of crosslinking by irradiation with different sources. Examples of the carbon fibers preparation from melt-processable acrylonitrile copolymers are considered in detail. A patent search was carried out and the information on the methods for producing carbon fibers from precursors based on melt-spun acrylonitrile copolymers are summarized.

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“…[ 21–32 ] Alternatively, melt spinnable PAN copolymers have again moved into the center of interest. [ 33–37 ]…”

Section: Introductionmentioning

confidence: 99%

Structure Evolution in Polyethylene‐Derived Carbon Fiber Using a Combined Electron Beam‐Stabilization‐Sulphurization Approach

Frank

Muks

Ota

et al. 2021

Macro Materials & Eng

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A new approach is described for the production of poly(ethylene) (PE) derived carbon fibers (CFs) that entails the melt spinning of PE fibers from a suitable precursor, their cross‐linking by electron beam (EB) treatment, and sulphurization with elemental sulphur (S8), followed by pyrolysis and carbonization. Instead of focusing on mechanical properties, analysis of CF structure formation during all process steps is carried out by different techniques comprising solid‐state nuclear magnetic resonance spectroscopy, thermogravimetric analysis coupled to mass spectrometry/infrared spectroscopy, elemental analysis, energy dispersive X‐ray scattering, scanning electron microscopy, Raman spectroscopy, and wide‐angle X‐ray diffraction. A key step in structure formation is the conversion of PE into poly(thienothiophene)s during sulphurization; these species are stabile under inert gas up to 700 °C as confirmed by Raman analysis. Above this temperature, they condense into poly(napthathienophene)s, which are then converted into graphite‐type structures during pyrolysis.

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Polyacrylonitrile Based Carbon Fibers Obtained from a Melt Spun Route

Cited by 4 publications

References 8 publications

Study on the Changes of Structures and Properties of PAN Fibers during the Cyclic Reaction in Supercritical Carbon Dioxide

Study on the Changes of Structures and Properties of PAN Fibers during the Cyclic Reaction in Supercritical Carbon Dioxide

Melt-Spinnable Polyacrylonitrile—An Alternative Carbon Fiber Precursor

Structure Evolution in Polyethylene‐Derived Carbon Fiber Using a Combined Electron Beam‐Stabilization‐Sulphurization Approach

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