Last edited by Shaktizuru
Saturday, July 25, 2020 | History

3 edition of A comparison of the Bromination dynamics of pitch-based and vapor-grown graphite fibers found in the catalog.

A comparison of the Bromination dynamics of pitch-based and vapor-grown graphite fibers

A comparison of the Bromination dynamics of pitch-based and vapor-grown graphite fibers

  • 92 Want to read
  • 10 Currently reading

Published by National Aeronautics and Space Administration, Lewis Research Center in [Cleveland, Ohio .
Written in English

    Subjects:
  • Graphite fibers -- Density.,
  • Bromine.,
  • Bromine.,
  • Fiber composites.,
  • Fiber orientation.,
  • Graphite.,
  • Intercalation.

  • Edition Notes

    Microfiche. [Washington, D.C. : National Aeronautics and Space Administration], 1986. 1 microfiche.

    StatementJames E. Gaier.
    SeriesNASA technical memorandum -- 87275.
    ContributionsLewis Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL16151195M

    Mesophase Pitch-based Carbon Fiber and Its Composites: Preparation and Characterization Chang Liu [email protected] This Thesis is brought to you for free and open access by the Graduate School at Trace: Tennessee Research and Creative Exchange. It has been. A representative scheme for the preparation of either GO or p-GO from either graphite or p-CF by modified Hummers method (SEM images of both graphite and p-CF are inserted).

    Start studying A Study of Fibers and Textiles. Learn vocabulary, terms, and more with flashcards, games, and other study tools. While ordinary graphite is weak, graphite fibers are extremely strong when pulled along the fiber axis. Explain in terms of the microstructure and the bonding in graphite. Best Answer % (1 rating) graphite fiber, carbon graphite or CF, is a material consisting of fibers about m in diameter and composed mostly of carbon atoms.

    formation of groups of short, broken fibers on the surface of a fabric that are tangled together in the shape of a tiny ball called a pill. i. Hydrophobic fibers tend to pill more due to increased static attraction. ii. Wool pills easily (scaly) iii. Weaker fiber = prone to breaking = pills fall off = pilling is unnoticeable 1. I.e. a method of separating components of mixtures based on preferential adsorption partitioning of components in a gas, liquid, or solution. In paper chromatography, the cellulose of the paper acts as the absorbing medium.


Share this book
You might also like
Italian

Italian

Literacy programs for adults with developmental disabilities

Literacy programs for adults with developmental disabilities

Holiday intentions 1985

Holiday intentions 1985

Paradigm change in theology

Paradigm change in theology

Adagio

Adagio

A new theory of the origins and early growth of Northampton.

A new theory of the origins and early growth of Northampton.

A sermon delivered in Gill, Mass., August 11, 1816

A sermon delivered in Gill, Mass., August 11, 1816

Minor Knickerbockers.

Minor Knickerbockers.

Oversight of state-run juvenile correctional facilities known as boot camps

Oversight of state-run juvenile correctional facilities known as boot camps

Thousand miles to Belton

Thousand miles to Belton

Consumption levels in Canada and the United States, 1947 to 1950.

Consumption levels in Canada and the United States, 1947 to 1950.

A comparison of the Bromination dynamics of pitch-based and vapor-grown graphite fibers Download PDF EPUB FB2

The results indicate that the bromination and debromination reactions proceed much slower for vapor grown fibers than for pitch : James Gaier. Get this from a library.

A comparison of the Bromination dynamics of pitch-based and vapor-grown graphite fibers. [James R Gaier; Lewis Research Center.]. the bromlnatlon and debrominatlon reactions proceed much slower for vapor-grown fibers than for pitch-based. While this may be due to the larger dia-meter of the vapor-grown fibers, the majority of the effect can probably be attributed to the differences in graphene plane orientation between the fiber j5 types.

The results indicate that the bromination and debromination reactions proceed much slower for vapor grown fibers than for pitch based.

While this may be due in part to the larger diameter of the vapor grown fibers, the majority of the effect can probably be attributed to the differences in graphene plane orientation between the fiber types.

The electrical resistance of four grades of pitch-based graphite fibers (Amoco P, P, P and P), and three experimental organic vapor-derived fibers (General Motors, GA Technologies and University of Nebraska) was recorded in situ during bromination and subsequent exposure to ambient laboratory air.

The results of this study indicate that the least graphitic pitch-based fiber (P) does Cited by: Bromination of graphitic pitch-based fibers Type II 20 40 60 26 (degrees) 80 Fig.

X-ray diffraction pattern of Type II du Pont E fibers at room temperature. The Miller indices correspond to graphite. The results indicate that the bromination and debromination reactions proceed much slower for vapor grown fibers than for pitch based.

While this may be due in part to the larger diameter of the. Electro-physical characteristics of brominated pitch-based carbon fibers (CF) have been measured in the 10– K temperature range.

The room-temperature electrical resistivity of these fibers has decreased by a factor of 7 relative to their initial state.

A comparison of the bromination rates of pitch-based and vapor-grown fibers [9] indicates that bromination takes much longer for the vapor-grown fiber {hours instead of minutes). Similarly, outgassing of Br2 from the edges of the fiber occurs on a much longer time scale with the vapor-grown fibers.

The electrical resistance of four grades of pitch-based graphite fibers and three experimental organic vapor-derived fibers was determined in situ during bromination and subsequent exposure to. Feasibility of intercalated graphite railgun armatures A comparison of the bromination dynamics of pitch-based and vapor-grown graphite fibers Although the reactions are slower in the.

Four different grades of pitch-based graphite fibers (Amoco P, P, P, and P) were intercalated with each of four different intercalates: bromide (Br 2), iodine monochloride (ICI), copper(II) chloride (CuCl 2), and nickel(II) chloride (NiCl 2).

All the pitch-based fibers tested, as well as vapor-grown fibers annealed to C, showed a substantial decrease in resistivity upon bromination but gave no indication of a phase change.

Bromination of Graphene and Graphite A. Yaya 1, C. Ewels, I. Suarez-Martinez 1;2,S. Lefrant1, A. Okotrub 3, L. Bulusheva, and P. Briddon4 1 Institut des Mat eriaux Jean Rouxel, Universit e de Nantes, CNRS UMRNantes, France 2 Nanochemistry Research Institute, Curtin University of Technology, Perth, WAAustralia 3 Nikolaev Institute of Inorganic Chemistry.

Watt, Chemistry and physics of the conversion of polyacrylonitrile fibers into high-modulus carbon fibers, in Handbook of Composites, Vol I — Strong Fibers, W. Watt and B. Perov, eds., Elsevier Science Publ., – (). (graphite / carbon black) Writing (graphite / carbon black) Painting (charcoal) Painting (charcoal) Gunpowder (wood based carbons) Gunpowder (wood based carbons) Carbon materials.

Applications Genesis, 6, “Make for yourself an ark of gopher wood; you shall make the ark with rooms, and shall cover it inside and out with pitch” Genesis, 6. Fig. 1 illustrates the XRD patterns of the isotropic and anisotropic pitch-based carbon fibers heat-treated at various temperatures. In comparison with AF and AF, the {} plane diffraction peaks (shown in Fig.

1(a)) of isotropic carbon fibers treated at various temperatures and AF are very weak. Fig. 1(b) shows the. PROPERTIES OF NOVEL CVD GRAPHITE FIBERS AND THEIR BROMINE INTERCALATION COMPOUNDS James R. Gaier NASA Lewis Research Center, Cleveland, Ohio Max L. Lake Applied Sciences Inc., Cedarville, Ohio Alia Moinuddin and Mark Marabito Cleveland State University, Cleveland, Ohio SUMMARY.

Pitch is a viscoelastic polymer material consisting of aromatic hydrocarbons. It is used to produce carbon fibers with sheet-like crystal structures.

The aim of the work presented in this paper was to evaluate the effects of pitch-based short carbon fibers on the workability, unit weight, and air content of freshly mixed mortar composite. The electrical resistance of four grades of pitch-based graphite fibers (Amoco P, P, P and P), and three experimental organic vapor-derived fibers (General Motors, GA Technologies and University of Nebraska) was recorded in situ during bromination.

This paper addresses the effect of bromination of carbon fibers on the CTE of their composites. In addition, the CTE of the fibers alone was measured. MATERIALS AND METHODS The unidirectional composite samples were fabricated using either PAN- based T fibers, pi tch-based P, or pi tch-based P fibers manufactured by Amoco.Stability of the Electrical Resistivity of Bromine, Iodine Monochloride, Copper (II) Chloride, and Nickel(II) Chloride Intercalated Pitch-Based Graphite Fibers ; Technological Hurdles to the Application of Intercalated Graphite Fibers ; A Comparison of the Bromination Dynamics of Various Carbon and Graphite Fibers The Study of Fibers and Textiles.

STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. Kendell_Middlebrook. Terms in this set (18) The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.

True.