Influence of Precursor Properties on the Thermal Stabilization of Polyacrylonitrile Fibers

Yu, Meijie; Wang, Chengguo; Bai, Yang; Wang, Yanxiang; Xu, Yong

doi:10.1007/s00289-006-0629-9

Cited by 54 publications

(37 citation statements)

References 15 publications

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“…1, DTA curve exhibited a wide and strong endothermic peak around 100°C, which could be attributed to the evaporation of solvent residue and water, since the absorption was accompanied with a slight weight loss. Previous studies also suggested that amorphous PAN could cause a broad absorption peak around this temperature [32]. An exothermic peak at 310°C was caused by the dehydrogenation, cyclization and cross-linking reaction in PAN phases [33,34].…”

Section: Resultsmentioning

confidence: 96%

Fabrication and characterization of carbon nanofibers with a multiple tubular porous structure via electrospinning

Liu

Zhang

et al. 2012

J Polym Res

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Carbon nanofibers with a multiple tubular porous structure were prepared via electrospinning from a polymer blend solution of polyacrylonitrile (PAN) and polylactide (PLA) followed by carbonization. The electrospun composite nanofibers underwent pre-oxidization and carbonization, which selectively eliminated PLA phases and transformed the continuous PAN phase into carbon, thereby porous structure formed in the carbon nanofibers. The morphologies of as-spun, pre-oxidized and carbonized nanofibers were studied by scanning electron microscope (SEM) and transmission electron microscopy (TEM). It was found that carbon nanofibers with an average diameter about 250 nm and a multiple tubular porous structure were obtained. The chemical changes during thermal treatment were studied by Fourier transform infrared spectrometer (FTIR), Raman spectra, differential thermal analysis (DTA) and thermogravimetric analysis (TG). The results showed that PLA phases were effectively removed and the continuous PAN phase was completely carbonized. The obtained carbon nanofibers had more disordered non-graphitized structures than nonporous nanofibers.

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Section: Resultsmentioning

confidence: 96%

Fabrication and characterization of carbon nanofibers with a multiple tubular porous structure via electrospinning

Liu

Zhang

et al. 2012

J Polym Res

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“…Another important observation is that the UV treatment of the fibers did not lead to any obvious hollow‐core structure formation in any of the UV‐treated fibers. Such structure is undesired because it leads to poor quality (mechanical properties) of the stabilized and carbonized fibers …”

Section: Resultsmentioning

confidence: 99%

Carbon fibers derived from UV‐assisted stabilization of wet‐spun polyacrylonitrile fibers

Morales

Ogale

2014

J of Applied Polymer Sci

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A rapid, dual‐stabilization route for the production of carbon fibers from polyacrylonitrile (PAN) precursor fibers is reported. A photoinitiator, 4,4′‐bis(diethylamino)benzophenone, was added to PAN solution before the fiber wet‐spinning step. After a short UV treatment that induced cyclization and crosslinking at a lower temperature, precursor fibers could be rapidly thermo‐oxidatively stabilized and successfully carbonized. Scanning electron microscopy micrographs show no deterioration of the microstructure or hollow‐core formation in the fibers due to UV treatment or presence of photoinitiator. Fast‐thermally stabilized pure PAN‐based carbon fibers show hollow‐core fiber defects due to inadequate thermal stabilization, but such defects were not observed in carbon fibers derived from fast‐thermally stabilized fibers that contained photoinitiator and were UV treated. Tensile testing results confirm that fibers containing 1 wt % photoinitiator and UV treated for 5 min display higher tensile modulus than all other sets of thermally stabilized and carbonized fibers. Wide‐angle X‐ray diffraction results show a higher development of the aromatic structure and molecular orientation in thermally stabilized fibers. No significant increase in interplanar spacing or decrease in crystals size were observed within the UV‐stabilized carbon fibers containing photoinitiator, but such fibers retain a higher extent of molecular orientation when compared with control fibers. These results establish for the first time, the positive effect of the external addition of photoinitiator and UV treatment on the properties of the PAN‐based fibers, and may be used to reduce the precursor stabilization time for faster carbon fiber production rate. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40623.

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“…These results indicate that POSS leads to the relatively slow rate of cyclisation reaction, which is consistent with the previous research. [18,19] It suggests that thermal stability and oxidation resistance of the PAN/POSS nanofibrous mats can be improved by the presence of POSS during the stabilisation. For the comparison, the representative absorption peaks before and after the stabilisation was summarised in Table 2.…”

Section: Characterisation Of Electrospinning Solutionmentioning

confidence: 97%

Effect of POSS content on the electrical, thermal, mechanical, and wetting properties of electrospun polyacrylonitrile (PAN)/POSS nanofibrous mats

Khil

Beom

et al. 2015

Journal of Experimental Nanoscience

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Although polyacrylonitrile (PAN) has excellent properties as a precursor of carbon fibre, octa-amic polyhedral oligomeric silsesquioxane (POSS) nanoparticles which are hybrid organicÀinorganic materials can be incorporated into PAN to tune up the properties such as the mechanical strength, thermal conductivity, and electronic conductivity for a broad range of potential applications. In this work, PAN with POSS of 1, 3, and 5 wt % based on acrylonitrile weight was prepared by solution polymerisation. The synthesised product was dissolved in dimethyl sulphoxide, followed by electrospinning. After electrospinning, the nanofibrous mats were stabilised at 250 C for 1 h. The diameter of resulting PAN/POSS nanofibrous mats were less than 1 mm, as confirmed by SEM analysis. The effect of POSS on PAN/POSS nanofibrous mats was studied by SEM, universal testing machine, contact angle measurement, Fourier transform infrared spectroscopy, wide angle X-ray diffraction, differential scanning calorimetry, and thermogravimetric analysis. The usefulness of the PAN/POSS nanofibre composites was realised from the improved electrical, thermal, mechanical, and wetting properties compared to pure PAN.

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Influence of Precursor Properties on the Thermal Stabilization of Polyacrylonitrile Fibers

Cited by 54 publications

References 15 publications

Fabrication and characterization of carbon nanofibers with a multiple tubular porous structure via electrospinning

Fabrication and characterization of carbon nanofibers with a multiple tubular porous structure via electrospinning

Carbon fibers derived from UV‐assisted stabilization of wet‐spun polyacrylonitrile fibers

Effect of POSS content on the electrical, thermal, mechanical, and wetting properties of electrospun polyacrylonitrile (PAN)/POSS nanofibrous mats

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