Chemical structure based prediction of PAN and oxidized PAN fiber density through a non-linear mathematical model

Badii, Khashayar; Church, Jeffrey S.; Golkarnarenji, Gelayol; Naebe, Minoo; Khayyam, Hamid

doi:10.1016/j.polymdegradstab.2016.06.019

Cited by 57 publications

(39 citation statements)

References 39 publications

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“…This is attributed to the decline of strongly intramolecular dipole-dipole interactions of nitrile group in stabilized fibers. In addition, it is found that in the later stage of TOS, the diffraction peak at 2θ = 29 disappears gradually, while a new diffraction peak appears at 2θ = 25.5 (corresponding to (002) plane and the average F I G U R E 3 Typical peak-fitting spectra in the range of 1,800- 1,020 ν C N in aliphatic amine [16] interlayer spacing of d = 0.33 nm), which indicated that a new sequence structure formed. Figure 6a,b showed the change of crystallinity value (X c ) and the crystallite size 260 C. This is because the linear structure of PAN fibers is destroyed and transformed into a new cyclic structure under the effect of TOS.…”

Section: Physical Structural Evolution Of Tos Processmentioning

confidence: 99%

The role of structural evolution of polyacrylonitrile fibers during thermal oxidative stabilization on mechanical properties

Yuan

Zhang

et al. 2020

J of Applied Polymer Sci

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The effects of chemical and physical structural evolution of polyacrylonitrile (PAN)-based carbon fibers precursor during thermal oxidative stabilization (TOS) on the mechanical properties of stabilized fibers were systematically studied. The results of Fourier transform infrared spectroscopy, wide-angle Xray diffraction, and density gradient column showed that the PAN fibers treated with high temperature and for long time have higher extent of cyclization, oxygen content, and crosslinking content. The crystallinity and crystallite size decreased with the increase of TOS time and temperature, whereas the bulk density of the stabilized fibers increased. The mechanical property results indicated that the decrease in tensile strength was inseparable from the formation of the cyclic structure and the amorphization transition of the crystal structure. The fibers have better structural stability when the extent of cyclization was 80-83%, the crystallinity was 34-45%, and the bulk density of stabilized fibers was 1.33-1.35 g/cm 3 , but exceeding these ranges, a serious skincore structure appeared.

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Section: Physical Structural Evolution Of Tos Processmentioning

confidence: 99%

The role of structural evolution of polyacrylonitrile fibers during thermal oxidative stabilization on mechanical properties

Yuan

Zhang

et al. 2020

J of Applied Polymer Sci

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“…Three precursor fiber samples were analyzed and their thermochemical properties were compared. The stabilization reaction is considered to occur according to the mechanism presented in Figure . A study by Liu et al .…”

Section: Resultsmentioning

confidence: 99%

“…There are three main peaks at 2243, 2210, and 2190 cm −1 that correspond to [CN], conjugated nitrile, and β‐amino nitrile groups, respectively . These three peaks can be used to predict the amount of unreacted PAN (2243 cm −1 ), ladder structure formation (around 2220 cm −1 ), and chain scission (2190 cm −1 ).…”

Section: Resultsmentioning

confidence: 99%

“…To process carbon fiber, PAN precursor fibers are stabilized in air at low temperature and carbonized in nitrogen atmosphere at high temperature. While a crucial step in production of carbon fiber, stabilization is known to be a slow and energy‐consuming process . Conversion of PAN precursor to carbon fibers includes two main thermal treatment steps: (I) thermal stabilization in air atmosphere and (II) carbonization at high temperature in nitrogen/argon atmosphere .…”

Section: Introductionmentioning

confidence: 99%

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Chemically Enhanced Wet‐Spinning Process to Accelerate Thermal Stabilization of Polyacrylonitrile Fibers

Fakhrhoseini

Khayyam

Naebe

2018

Macro Materials & Eng

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In this study, a fast and inexpensive approach is introduced to assist stabilization of polyacrylonitrile (PAN) fibers by adding ammonium iron(II) sulfate in coagulation bath. Effects of chemical treatment on stabilization process and structural evolution of fibers are studied using calorimetric, infrared, and X‐ray techniques. A stepwise infrared study confirms the assisted cyclization reaction, and an X‐ray analysis reveals a significant improvement in crystallinity and orientation of polymer chains which lead to an increase in tensile strength and modulus of PAN fibers. Differential scanning calorimetry results show 13 °C reductions in peak temperature of the stabilization reaction which means a sign of chemical activation at lower temperature by adding sulfate ions. Quantification of IR spectra shows a 7% increase in extent of reaction of chemically treated fibers and higher degree of conjugation compared with untreated and post‐treated fibers. Finally, mechanical properties of chemically treated fibers are improved due to an increase in size and orientation of polymer chains after chemical treatment in the coagulation bath. Compared to control and post‐treated PAN fibers, thermochemical properties of presented fibers are improved due to chemically assisted stabilization, and as a consequence, energy consumption of the stabilization step will be reduced by a simple and facile treatment.

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“…It has been developed as a new materials for wigs because of the better thermal properties [13,14]. The PAN wig fiber have a natural appearance and good flame resistance under modification, and it is often used to prepare high-grade wig products [15,16]. In conclusion, synthetic fiber have been extensively used to prepare wig products, and also exhibits good property in elasticity, softness and warmth.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of novel super-artificial hair fiber based on biomass materials

Yang

Guo

Zhang

et al. 2017

International Journal of Biological Macromolecules

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A novel super-artificial hair fiber basing on sodium alginate (SA) and Antarctic Krill protein (AKP) was prepared by wet spinning successfully. Such SA/AKP fiber did not only have similar crystalline structure with human hair, but also had super flame resistance and mechanical performance. It should be noted that the whole preparation process was green without any incorporation of non-toxic solution. Moreover, comparing with human hair, the SA/AKP fiber had a lot of unique groove upon the fiber surface, which contributed a lot to excellent hygroscopicity. Meanwhile, the dyeing performance could be improved notably due to incorporation of protein into the matrix. Herein, the SA/AKP fiber with superior mechanical and functional performance had practical value for application in the field of synthetic wig.

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Chemical structure based prediction of PAN and oxidized PAN fiber density through a non-linear mathematical model

Cited by 57 publications

References 39 publications

The role of structural evolution of polyacrylonitrile fibers during thermal oxidative stabilization on mechanical properties

The role of structural evolution of polyacrylonitrile fibers during thermal oxidative stabilization on mechanical properties

Chemically Enhanced Wet‐Spinning Process to Accelerate Thermal Stabilization of Polyacrylonitrile Fibers

Preparation and characterization of novel super-artificial hair fiber based on biomass materials

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