The effect of precarbonization on mechanical properties of final polyacrylonitrile-based carbon fibres

Ko, Tse‐Hao; Day, Tzyy-Chin; Lin, Min

doi:10.1007/bf01910099

Cited by 17 publications

(7 citation statements)

References 5 publications

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“…The most likely structure is to form ladder PAN chains structure which can withstand the high temperature processing. [31][32][33][34] Zn was added to the PAC in the heating.…”

Section: Characterization Of Polyacrylonitrile (Pan)-based Activated ...mentioning

confidence: 99%

Adsorption of hexavalent chromium by polyacrylonitrile (PAN)-based activated carbon fibers from aqueous solution

et al. 2015

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“…The most likely structure is to form ladder PAN chains structure which can withstand the high temperature processing. [31][32][33][34] Zn was added to the PAC in the heating.…”

Section: Characterization Of Polyacrylonitrile (Pan)-based Activated ...mentioning

confidence: 99%

Adsorption of hexavalent chromium by polyacrylonitrile (PAN)-based activated carbon fibers from aqueous solution

et al. 2015

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“…When heated in the right conditions, these chains bond side-to-side, forming graphene sheets. The resulting fibers usually contain 93-95% carbon[68,[75][76][77][78][79][80][81][82][83].…”

mentioning

confidence: 99%

Poly (acrylonitrile – co -1-vinylimidazole): A new melt processable carbon fiber precursor

Deng

Lobovsky²,

Iacono

et al. 2011

Polymer

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Carbon fiber polymer composites have attracted worldwide interest in sporting goods and aerospace industries due to their excellent specific strength, stiffness and lightweight. The replacement of solution-spinning process by melt-spinning process is one of the major approaches to make cost effective carbon fiber. In recent years, researchers have explored the possibilities to synthesize melt processable carbon fiber precursors, but their thermal stabilization is still a challenge. The goal for this research project is to prepare melt processable carbon fiber precursors which have the capability of thermal stabilization. Acrylonitrile/1-vinylimidazole (AN/VIM) copolymers containing various mol% of VIM were synthesized by free radical solution polymerization. The copolymers were characterized by Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy, 1 H-NMR spectroscopy, gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). 82/18 mol percent of AN/VIM copolymer based carbon fiber precursor was processed by melt spinning at 192 °C and thermal stabilization of the melt-spun fiber was achieved by heating in air at 250 °C for 5 hrs. The change of fiber structure during stabilization process was confirmed with ATR-IR spectra. Tan Delta value of the stabilized fiber is 0.17, which is much lower than that of as-spun fiber, about 2.12. The oxidized fiber (250 °C / 5 h) did keep its shape after carbonization at 1000 °C for 2 h, which indicates that poly (acrylonitrile-co-1-vinylimidazole) melt-spun fiber after thermal stabilization can be carbonized. A novel dispersion polymerization of poly (acrylonitrileco-1iii vinylimidazole) by using small amount of protonated copolymer itself as a stabilizer was also introduced in this study. Poly (acrylonitrileco-1-vinylimidazolium tetrafluoroborate) and poly (acrylonitrileco-1-vinylimidazolium hexafluorophosphate) were synthesized for gas separation membranes. Terpolymers of methyl methacrylate, methyl acrylate and furfuryl methacrylate (MMA/MA/FMA) were synthesized successfully by solution polymerization and emulsion polymerization and were characterized by 1 H NMR, ATR-IR and DSC. The thermo-reversible property of MMA/MA/FMA and BMI cross-linked polymer was confirmed by solubility test. The MMA/MA/FMA and BMI cross-linked polymer emulsion can be applied for making thermally re-moldable carbon fiber composite. iv DEDICATION I dedicate this work to my parents. I am blessed for being their daughter. v ACKNOWLEDGMENTS I want to deeply thank Prof. Dennis W. Smith, Jr. for his tremendous support throughout my graduate study. I would like to express gratitude to Prof. Rhett C. Smith for his guidance and help. I would like to thank my committee members, Prof. Stephen. E. Creager, Prof.

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“…We have already discussed the effect of stabilization on the properties of the carbon fibers. In the previous study, 16 we found that the appropriate precarbonization process was very beneficial to the improvement of the tensile strength or in Young's modulus of the carbon fibers. These fibers were prepared in order to study more clearly the effect of precarbonization on the properties of the final carbon fibers after varying periods of air oxidation.…”

Section: A Properties Of Raw Carbon Fibersmentioning

confidence: 87%

The characterization of high-performance PAN-based carbon fibers developed by continuous carbonization and air oxidation

1995

J. Mater. Res.

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The properties of four kinds of Type II carbon fibers, which had been precarbonized at 300 °C, 400 °C, 500 °C, and 600 °C, respectively, during two-stage continuous carbonization, were measured after being air oxidized for periods of 1 to 6 min at 550 °C. The effects of precarbonization temperature on mechanical properties, density, morphology, elemental composition, and microstructure of the carbon fibers during the air oxidation are discussed in this article. The precarbonization process strongly affected the surface properties and mechanical properties of the final oxidized carbon fibers. The carbon fibers developed from the different precarbonization temperatures all had different structures. The carbon fibers that had been precarbonized at 300 °C had a more ordered structure than other fibers after air oxidation. These carbon fibers also had a higher performance than the other fibers. Carbon fibers also showed different oxidation behaviors caused by differences in surface morphology resulting from each different precarbonization temperature. Optimum conditions not only improved the tensile strength and modulus, but also increased the density and oxygen content. Experimental results showed that the tensile strength of the carbon fibers precarbonized at 300 °C increased from 2.4 GPa to 4.3 GPa (80%) after 6 min oxidation at 550 °C. 1 carbon fibers I Type I carbon fibers FIG. 1. Simplified schematic description of the carbon fiber process.

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The effect of precarbonization on mechanical properties of final polyacrylonitrile-based carbon fibres

Cited by 17 publications

References 5 publications

Adsorption of hexavalent chromium by polyacrylonitrile (PAN)-based activated carbon fibers from aqueous solution

Adsorption of hexavalent chromium by polyacrylonitrile (PAN)-based activated carbon fibers from aqueous solution

Poly (acrylonitrile – co -1-vinylimidazole): A new melt processable carbon fiber precursor

The characterization of high-performance PAN-based carbon fibers developed by continuous carbonization and air oxidation

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