A study of pitch-based precursors for general purpose carbon fibres

Carbon fibers are prepared by stabilizing pitch fibers accompanying electron beam (E-beam) irradiation. The carbon fibers pretreated by E-beam irradiation achieve a higher stabilization index than the carbon fibers that are only heat-stabilized. In addition, the carbon fibers subjected to E-beam irradiation in the stabilization step exhibit a comparable tensile strength to that of general purpose carbon fibers. The carbon fibers pretreated with an absorbed dose of 3000 kGy have a tensile strength of 0.54 GPa for a similar fiber diameter. Elemental, Fourier-transform infrared spectroscopy, and thermogravimetric analyses indicate that Ebeam irradiation is an efficient oxidation and dehydrogenation treatment for pitch fibers by showing that the intensity of the aliphatic C-H stretching and aromatic CH 2 bending (out-ofplane) bands significantly decrease and carbonyl and carboxylic groups form.

Section: Mechanical Properties After Carbonizationsupporting

confidence: 65%

Stabilization of pitch-based carbon fibers accompanying electron beam irradiation and their mechanical properties

Park¹,

Ko²,

Jung³

et al. 2015

“…2 it can be observed that the time necessary to reach the relative crystallinity degree of 30% increased with the radiation dose, indicating the dose increase had a retarding effect. On the other hand, the diagrams of samples irradi- [27][28][29].…”

Section: Radiationmentioning

confidence: 99%

Effects of cross-linking methods for polyethylene-based carbon fibers: review

Kim¹,

Lee²,

An³

et al. 2015

In recent decades, there has been an increasing interest in the use of carbon fiber reinforced plastic (CFRP) in aerospace, renewable energy and other industries, due to its low weight and relatively good mechanical properties compared with traditional metals. However, due to the high cost of petroleum-based precursors and their associated processing costs, CF remains a specialty product and as such has been limited to use in high-end aerospace, sporting goods, automotive, and specialist industrial applications. The high cost of CF is a problem in various applications and the use of CFRP has been impeded by the high cost of CF in various applications. This paper presents an overview of research related to the fabrication of low cost CF using polyethylene (PE) control technology, and identifies areas requiring additional research and development. It critically reviews the results of cross-linked PE control technology studies, and the development of promising control technologies, including acid, peroxide, radiation and silane cross-linking methods.

“…Even though demand for PAN-based CFs has continuously increased, they have many limitations related to high cost and low productivity [5]. On the other hand, pitch-based CFs have advantages in terms of low cost and environment concerns because the precursor materials are wood, oil from distillation of coal, and bottom oil from distillation of petroleum [6,7]. Also, pitch-based CFs have a better elastic modulus and thermal conductivity than those of PAN-based CFs [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Preparation of pitch from pyrolized fuel oil by electron beam radiation and its melt-electrospinning property

Jung¹,

Lee²

2014

Spinnable pitch for melt-electrospinning was obtained from pyrolized fuel oil by electron beam (E-beam) radiation treatment. The modified pitch was characterized by measuring its elemental composition, softening point, viscosity, molecular weight, and spinnability. The softening point and viscosity properties of the modified pitch were influenced by reforming types (heat or E-beam radiation treatment) and the use of a catalyst. The softening point and molecular weight were increased in proportion to absorbed doses of E-beam radiation and added AlCl 3 due to the formation of pitch by free radical polymerization. The range of the molecular weight distribution of the modified pitch becomes narrow with better spinning owing to the generated aromatic compounds with similar molecular weight. The diameter of melt-electrospun pitch fibers under applied power of 20 kV decreased 53% (4.7 ± 0.9 μm) compared to that of melt-spun pitch fibers (10.2 ± 2.8 μm). It is found that E-beam treatment for reforming could be a promising method in terms of time-savings and cost-effectiveness, and the melt-electrospinning method is suitable for the preparation of thinner fibers than those obtained with the conventional melt-spinning method.