Microstructural heterogeneity on the cylindrical surface of carbon fibers analyzed by Raman spectroscopy

Ren, Guizhi; Chen, Cong-jie; Li-hui, Deng; Quan, Haiyu; Lu, Youming; Wu, Qilin

doi:10.1016/s1872-5805(15)60202-5

Cited by 18 publications

(6 citation statements)

References 21 publications

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“…Two characteristic peaks around 1360 cm −1 and 1590 cm −1 correspond to disordered carbon (D band) and ordered carbon (G band), respectively. The D peak and the G peak are attributed to the A 1g vibration of disordered carbon and the E 2g vibration of ordered carbon, respectively [ 47 ]. The graphitization degree of the char residue is usually expressed by the integral ratio between the D band and the G band (I D /I G ) [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

A Novel P/N/Si-Containing Vanillin-Based Compound for a Flame-Retardant, Tough Yet Strong Epoxy Thermoset

Chi

Peng

et al. 2023

Polymers

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It is still extremely challenging to endow epoxy resins (EPs) with excellent flame retardancy and high toughness. In this work, we propose a facile strategy of combining rigid–flexible groups, promoting groups and polar phosphorus groups with the vanillin compound, which implements a dual functional modification for EPs. With only 0.22% phosphorus loading, the modified EPs obtain a limiting oxygen index (LOI) value of 31.5% and reach V-0 grade in UL-94 vertical burning tests. Particularly, the introduction of P/N/Si-containing vanillin-based flame retardant (DPBSi) improves the mechanical properties of EPs, including toughness and strength. Compared with EPs, the storage modulus and impact strength of EP composites can increase by 61.1% and 240%, respectively. Therefore, this work introduces a novel molecular design strategy for constructing an epoxy system with high-efficiency fire safety and excellent mechanical properties, giving it immense potential for broadening the application fields of EPs.

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Section: Resultsmentioning

confidence: 99%

A Novel P/N/Si-Containing Vanillin-Based Compound for a Flame-Retardant, Tough Yet Strong Epoxy Thermoset

Chi

Peng

et al. 2023

Polymers

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“…Raman spectroscopy has been proved to be a sensitive method to characterize carbon structures. The first‐order Raman spectra of the carbon fibers contains two prominent peaks: peak located at about ~1350 cm −1 (D band) which is assigned to defects and disordered carbons, 33 and peak at ~1580 cm −1 (G band) which is corresponded to the E 2g vibrational mode of graphiticplanes 34 . The D/G ratio represents the graphitic degree of carbon structures, and a lower value suggests a higher degree of graphitization or more ordered carbon structures.…”

Section: Resultsmentioning

confidence: 99%

Polyacrylonitrile based carbon fibers: Spinning technology dependent precursor fiber structure and its successive transformation

et al. 2021

J of Applied Polymer Sci

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In this study, the effects of different spinning methods including traditional wet and dry‐jet wet spinning, and newly developed dry‐jet gel spinning, on the structures and performances of polyacrylonitrile fibers, as well as the structural evolution during stabilization and carbonization, are compared in detail. The structural differences along radial direction, surface roughness, and chain orientation of carbon fibers are inherited from their precursor fibers, and these factors are determined by spinning technologies and processing conditions. Among all spinning methods, dry‐jet gel spinning could prepare fibers with the best chain orientation, the highest tensile properties, and the lowest surface roughness, which would be favorable for achieving higher mechanical performance. Additionally, for the resultant carbon fibers, the surface modification of dry‐jet gel spun carbon fibers is easier than dry‐jet wet spun carbon fibers, and comparable to wet spun carbon fibers. Overall, dry‐jet gel spinning is promising to make carbon fibers with both excellent tensile properties and good interfacial adhesion with epoxy matrix.

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“…1. The properties of some of the examined carbonaceous materials (ex., highly graphitized materials with a precise ratio of 85:15 sp 2 :sp 3 hybridization [32], oxidative plasma-treated HOPG [48], or GP [49]) do not reflect the structural properties of commercially used carbon substrates (as CF, mostly ex-PAN [126][127][128]) available for large-scale industrial use and applications. 2.…”

Section: Growth Of Vacnt On Carbon Substrates With-/-out Surface Modi...mentioning

confidence: 99%

Conducting Interface for Efficient Growth of Vertically Aligned Carbon Nanotubes: Towards Nano-Engineered Carbon Composite

2022

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Vertically aligned carbon nanotubes (VACNT) are manufactured nanomaterials with excellent properties and great potential for numerous applications. Recently, research has intensified toward achieving VACNT synthesis on different planar and non-planar substrates of various natures, mainly dependent on the user-defined application. Indeed, VACNT growth has to be adjusted and optimized according to the substrate nature and shape to reach the requirements for the application envisaged. To date, different substrates have been decorated with VACNT, involving the use of diffusion barrier layers (DBLs) that are often insulating, such as SiO2 or Al2O3. These commonly used DBLs limit the conducting and other vital physico-chemical properties of the final nanomaterial composite. One interesting route to improve the contact resistance of VACNT on a substrate surface and the deficient composite properties is the development of semi-/conducting interlayers. The present review summarizes different methods and techniques for the deposition of suitable conducting interfaces and controlled growth of VACNT on diverse flat and 3-D fibrous substrates. Apart from exhibiting a catalytic efficiency, the DBL can generate a conducting and adhesive interface involving performance enhancements in VACNT composites. The abilities of different conducting interlayers are compared for VACNT growth and subsequent composite properties. A conducting interface is also emphasized for the synthesis of VACNT on carbonaceous substrates in order to produce cost-effective and high-performance nano-engineered carbon composites.

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Microstructural heterogeneity on the cylindrical surface of carbon fibers analyzed by Raman spectroscopy

Cited by 18 publications

References 21 publications

A Novel P/N/Si-Containing Vanillin-Based Compound for a Flame-Retardant, Tough Yet Strong Epoxy Thermoset

A Novel P/N/Si-Containing Vanillin-Based Compound for a Flame-Retardant, Tough Yet Strong Epoxy Thermoset

Polyacrylonitrile based carbon fibers: Spinning technology dependent precursor fiber structure and its successive transformation

Conducting Interface for Efficient Growth of Vertically Aligned Carbon Nanotubes: Towards Nano-Engineered Carbon Composite

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