Laser Raman spectroscopy for determination of the C-C bonding length in carbon

Dieser Aufsatz gibt einen Überblick über Präkursorsysteme, deren Verarbeitung und die resultierenden Eigenschaften der Carbonfasern (CF) in Abhängigkeit des Präkursors und berücksichtigt dabei die neuesten Entwicklungen auf dem Gebiet der alternativen Präkursoren für die Herstellung von preisgünstigeren CF. Es werden folgende Präkursoren behandelt: Polyacrylnitril‐basierte Copolymere, Pech, Cellulose, Lignin, Polyethylen und neue synthetische Polymerpräkursoren für hochwertige CF. Außerdem werden Zusammenhänge zwischen Struktur und Eigenschaften aufgezeigt, und es werden verschiedene Modelle vorgestellt, die sowohl die Struktur als auch die Morphologie von CF beschreiben.

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“… Raman‐Spektren von kommerziell erhältlichen pech‐ und PAN‐basierten CF 219. Reproduziert mit freundlicher Genehmigung von Elsevier.…”

Section: Modelle Für Die Cf‐struktur Und ‐Morphologieunclassified

Carbonfasern: Präkursor‐Systeme, Verarbeitung, Struktur und Eigenschaften

et al. 2014

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“…The former is called D peak (disordered or amorphous carbons), and the later is called G peak (graphite carbon). The fractional value f for the amount of ordered sp 2 C atoms under peak G can be estimated using the intensity ratio of the two peaks [20,21]. The results indicate that the content of sp 2 C atoms in these carbon fibers increases with increasing tensile strength of those corresponding PFs.…”

Section: Resultsmentioning

confidence: 93%

Microwave promoted rapid curing reaction of phenolic fibers

Liu

Ying

Feng

et al. 2008

Polymer Degradation and Stability

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“…Where the constant K = 31.86 nm 2 cm −1 19 . Thus, we obtain the equilibrium equation about bond length variance as:

\frac{\sqrt{K / v_{ε}} - \sqrt{K / v_{0}}}{\sqrt{K / v_{0}}} = \frac{f_{1} ((), \cos ((), \frac{θ}{2}) + 1)}{3 k \cos ((), \frac{θ}{2})}

…”

Section: Methodsmentioning

confidence: 99%

“…For the size of micro-crystal and bond length were measured by experimental methods, from the Equations set (12), (15), (19), if p is known, ε and θ, could be solved. The in-plane modulus of graphitic layers could be calculated as:…”

Section: Theoretical Modelmentioning

confidence: 99%

“…With the development of laser Raman spectra (LRS) testing technology, the deformation of the covalent bond in carbon can be detected, which provides a possibility to study the e 1 value of graphitic layers in carbon fibers directly. [17][18][19] The problem is that under a stress, in addition to the change of bond length, the bond angle is also changed. 20,21 So, models for calculating the deformation of a carbon layer based on the bond deformation detected by dynamic Raman is needed.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of carbon fiber structure based on dynamic laser Raman spectroscopy

Sun

Wang

et al. 2020

J of Applied Polymer Sci

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The in‐plane modulus and inter layer shear modulus are the intrinsic properties determining the carbon fiber's characterization, but could not be gotten for a single sample. With the addition of dynamic Raman spectra, the parameters are obtained from five carbon fibers individually, which interpret perfectly that the Young's modulus and conductivities are not consistent according to the normal views. The mesophase pitch‐based graphitized carbon fiber has thermal conductivity of 635 Wm−1 K−1, much higher than 78 Wm−1 K−1 of the polyacrylonitrile graphitized carbon fiber, even the modulus of the latter is higher than the former. The Young's modulus of polyacrylonitrile carbon fiber and rayon‐based graphitized carbon fiber are 260 and 140 GPa; however, their thermal conductivities are lower than 1.0 Wm−1 K−1. With these two intrinsic properties, the structure of a carbon fiber can be understood clearly, so that the properties can be enhanced accordingly.

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Laser Raman spectroscopy for determination of the C-C bonding length in carbon

Cited by 33 publications

References 6 publications

Carbonfasern: Präkursor‐Systeme, Verarbeitung, Struktur und Eigenschaften

Carbonfasern: Präkursor‐Systeme, Verarbeitung, Struktur und Eigenschaften

Microwave promoted rapid curing reaction of phenolic fibers

Analysis of carbon fiber structure based on dynamic laser Raman spectroscopy

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