A three-dimensional structural model for a high modulus pan-based carbon fibre

Barnet, F. Robert; Norr, Marriner K.

doi:10.1016/0010-4361(76)90019-7

Cited by 30 publications

(22 citation statements)

References 14 publications

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“…High polymer concentration in the solution as well as slow precipitation leads to a decrease in porosity and growth of the mechanical properties of fibers. Similar results were mentioned in, where noticeable changes in the fiber structure and a remarkable decrease in defectiveness were observed upon increasing the polymer concentration from 8% to 22%.…”

Section: Resultssupporting

confidence: 88%

From Polyacrylonitrile, its Solutions, and Filaments to Carbon Fibers II. Spinning PAN‐Precursors and their Thermal Treatment

et al. 2016

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Based on the results of Part 1 of this work, we have chosen acrylonitrile copolymers for preparing dopes in dimethyl sulfoxide (DMSO). Modeling the spinning process in static conditions was carried out by following the evolution of the interaction between a drop of solution and precipitant. In addition, the diffusion zone was controlled by the laser-interference method. Fibers were spun on a laboratory stand. It was found that the optimal ratio of DMSO to water in a coagulation bath was 85/15. The analysis of the structure of different fibers (including fibers with carbon nanotubes) demonstrated the superposition of crystalline phase and orientation-disordered mesophase. The evolution of this structure could provide the answer to the question of which structure of "white" fibers is best for obtaining high-quality "black" fibers. Measurement of the structure and mechanical properties of fibers allowed us to optimize the technology of thermal treatment of fibers including the intensity of heat output in the stages of thermal-oxidative stabilization and carbonization as well as the strain characteristics and applied tension. Model carbon fibers have a satisfactory complex of mechanical properties. We aimed to choose a set of experimental approaches as a proper way to produce high-strength carbon fibers.

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Section: Resultssupporting

confidence: 88%

From Polyacrylonitrile, its Solutions, and Filaments to Carbon Fibers II. Spinning PAN‐Precursors and their Thermal Treatment

et al. 2016

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“…This may be attributed to the hoop stress in the fiber radial direction induced by shrinkage of the fiber and strengthening of bonding forces between molecules when the temperature decreased from RT to 77 K. Moreover, the reduction of micro-and nano-sized pores in the fiber may affect the changes of interlayer spacing [28,29] because the compression stress may force anisotropic expanding and merging of tiny pores leading to looser molecular packing along the fiber axial direction and tighter molecular arrangement in fiber radial direction when the fibers undertake TPCM process.…”

Section: X-ray Diffraction Analysismentioning

confidence: 94%

Tensile and interfacial properties of polyacrylonitrile-based carbon fiber after different cryogenic treated condition

Zhang

et al. 2016

Composites Part B: Engineering

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“…Carbon fiber properties are directly dependent on the quality of the precursor fiber [1][2][3]. Carbon fiber modulus has been shown to be directly proportional to the polyacrylonitrile (PAN) precursor modulus [4].…”

Section: Introductionmentioning

confidence: 99%

Properties of PAN Fibers Solution Spun into a Chilled Coagulation Bath at High Solvent Compositions

Morris

Weisenberger

Rice

2015

Fibers

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Abstract:In this work, multifilament, continuous polyacrylonitrile (PAN) fiber tow was solution spun mimicking industrial processing at the small pilot scale (0.5 k tow), while carefully altering the composition of the coagulation bath, in order to determine the effect on the resulting fiber shape, density, orientation, and tensile properties at varying points in the spinning process. Novel here are the abnormally high coagulation bath solvent compositions investigated, which surpass those often reported in the literature. In addition, the coagulation bath was maintained at a slightly chilled temperature, contrary to reported methods to produce round fibers. Further, by altering the composition of the bath in a step-wise fashion during a single spinning run, variations in all other process parameters were minimized. We found that with increasing solvent composition in the coagulation bath, the fibers not only became round in cross section, but also became smaller in diameter, which persisted down the spin line. With this decrease in diameter, all else equal, came an accompanying increase in apparent fiber density via a reduction in microvoid content. In addition, molecular orientation and tensile properties also increased. Therefore, it was found that inadequate understanding of the coagulation bath effects, and spinning at low coagulation bath solvent compositions, can hinder the ability of the fiber to reach optimum properties.

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A three-dimensional structural model for a high modulus pan-based carbon fibre

Cited by 30 publications

References 14 publications

From Polyacrylonitrile, its Solutions, and Filaments to Carbon Fibers II. Spinning PAN‐Precursors and their Thermal Treatment

From Polyacrylonitrile, its Solutions, and Filaments to Carbon Fibers II. Spinning PAN‐Precursors and their Thermal Treatment

Tensile and interfacial properties of polyacrylonitrile-based carbon fiber after different cryogenic treated condition

Properties of PAN Fibers Solution Spun into a Chilled Coagulation Bath at High Solvent Compositions

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