Evolution of structure and properties of PAN precursors during their conversion to carbon fibers

Zhang, Wangxi; Liu, Jie; Wu, Gang

doi:10.1016/s0008-6223(03)00391-9

Cited by 443 publications

(182 citation statements)

References 7 publications

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“…Ouyang [17] , Mathur [20] and Wangxi [21] , also found an evident assignment of the carbonyl group of great intensity in PAN fiber copolymerized with itaconic acid and vinyl acetate, using IR technique.…”

Section: Ft-ir Analysismentioning

confidence: 92%

Thermal Stabilization study of polyacrylonitrile fiber obtained by extrusion

et al. 2015

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SbstractA low cost and environmental friendly extrusion process of the Polyacrylonitrile (PAN) polymer was viabilized by using the 1,2,3-propanetriol (glycerol) as a plasticizer. The characterization of the fibers obtained by this process was the object of study in the present work. The PAN fibers were heat treated in the range of 200 °C to 300 °C, which is the temperature range related to the stabilization/oxidation step. This is a limiting phase during the carbon fiber processing. The characterization of the fibers was made using infrared spectroscopy, thermal analysis and microscopy. TGA revealed that the degradation of the extruded PAN co-VA fibers between 250 °C and 350 °C, corresponded to a 9% weight loss to samples analyzed under oxidizing atmosphere and 18% when the samples were analyzed under inert atmosphere. DSC showed that the exothermic reactions on the extruded PAN co-VA fibers under oxidizing synthetic air was broader and the cyclization started at a lower temperature compared under inert atmosphere. Furthermore, FT-IR analysis correlated with thermal anlysis showed that the stabilization/oxidation process of the extruded PAN fiber were coherent with other works that used PAN fibers obtained by other spinning processes.

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Section: Ft-ir Analysismentioning

confidence: 92%

Thermal Stabilization study of polyacrylonitrile fiber obtained by extrusion

et al. 2015

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“…As can be observed in Figure 1, the volatile release takes place in three stages (Jing et al 2007, Wangxi et al 2003. In the first stage, at 200-350 ºC, cross-linking reactions between oxidized PAN polymer chains take place, through radicals generated by the 7 decomposition of terminal oxygen-containing and nitrogen containing groups ( Figure 2).…”

Section: Carbonization Of Panox Fibresmentioning

confidence: 99%

Unusual pre-oxidized polyacrylonitrile fibres behaviour against their activation with CO2: carbonization effect

2016

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Abstract.The CF-PAN activation process with CO2 has been analysed. Activation of CF-PAN with CO2 leads to unusual results both, activation percentage evolution over the time and generated porosity development. In the explanation has been highlighted the role of the carbonization step in the CF-PAN activation process. The analysed results point to the fact that part of the released nitrogen-containing compounds during PANOX fibres carbonization are deposited on the CF surface, which affects to carbonized PAN fibres, decreasing actives sites, or acting as inhibitors of the gasification reaction.* Corresponding

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“…They are known for their high specific strength, melting point, elastic modulus, thermal resistance, and thermal conductivity [3][4][5]. Recently, PAN-based carbon fibers have seen wide use in leisure, aviation, aerospace, military, and energy sectors because they satisfy industrial demands for lightweight and high-strength materials [6,7].…”

Section: Introductionmentioning

confidence: 99%

Microstructural changes of polyacrylonitrile-based carbon fibers (T300 and T700) due to isothermal oxidation (1): focusing on morphological changes using scanning electron microscopy

Oh¹,

Lee²,

Kang³

et al. 2016

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Polyacrylonitrile (PAN)-based carbon fibers have high specific strength, elastic modulus, thermal resistance, and thermal conductivity. Due to these properties, they have been increasingly widely used in various spheres including leisure, aviation, aerospace, military, and energy applications. However, if exposed to air at high temperatures, they are oxidized, thus weakening the properties of carbon fibers and carbon composite materials. As such, it is important to understand the oxidation reactions of carbon fibers, which are often used as a reinforcement for composite materials. PAN-based carbon fibers T300 and T700 were isothermally oxidized in air, and microstructural changes caused by oxidation reactions were examined. The results showed a decrease in the rate of oxidation with increasing burn-off for both T300 and T700 fibers. The rate of oxidation of T300 fibers was two times faster than that of T700 fibers. The diameter of T700 fibers decreased linearly with increasing burn-off. The diameter of T300 also decreased with increasing burn-off but at slower rates over time. Cross-sectional observations after oxidation reactions revealed hollow cores in the longitudinal direction for both T300 and T700 fibers. The formation of hollow cores after oxidation can be traced to differences in the fabrication process such as the starting material and final heat treatment temperature.

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Evolution of structure and properties of PAN precursors during their conversion to carbon fibers

Cited by 443 publications

References 7 publications

Thermal Stabilization study of polyacrylonitrile fiber obtained by extrusion

Thermal Stabilization study of polyacrylonitrile fiber obtained by extrusion

Unusual pre-oxidized polyacrylonitrile fibres behaviour against their activation with CO2: carbonization effect

Microstructural changes of polyacrylonitrile-based carbon fibers (T300 and T700) due to isothermal oxidation (1): focusing on morphological changes using scanning electron microscopy

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