Accession Number : AD0267921

Title :   Foam Cokes.

Corporate Author : LIBRARY OF CONGRESS WASHINGTON DC AEROSPACE TECHNOLOGY DIV

Report Date : 07 NOV 1961

Pagination or Media Count : 1

Abstract : New heat-resistant foamed materials have been produced by the coking of foamed plastics. In the manufacturing process, initial specimens of foamed plastic are placed in a special mixture, heated to a temperature above the pyrolysis temperature, and cooled to room temperature. Most of the foamed plastics studied exhibited a weight loss of 35 to 66% during the coking process. The volume weights of foam cokes surpassed those of the initial foamed plastics by 7 to 10%. The chemical structure of the polymers used affected both the behavior of the foamed plastics during the pyrolysis process and the properties of foam cokes. Foam cokes exhibit higher heat resistance, rigidity, and compressive strength at room and high temperatures than foamed plastics. The dielectric properties of foamed cokes differ considerably from those of foamed plastics and approach those of conducting materials. In general, carbon blacks, cokes, and graphites increase the yield of foamed coke and secure maximum stability of linear dimensions, but reduce compressive strength at high temperatures. (Author)

Descriptors :   ALDEHYDES, ALUMINUM, ALUMINUM COMPOUNDS, CALCIUM COMPOUNDS, CARBON BLACK, CHARCOAL, DECOMPOSITION, DEGRADATION, DIELECTRIC PROPERTIES, ELECTRICAL PROPERTIES, EPOXY RESINS, EXPANDED PLASTICS, GRAPHITE, HEAT RESISTANT PLASTICS, OXIDES, PHENYL RADICALS, PRODUCTION, PYROLYSIS, SILICATES, SILICON COMPOUNDS, STABILITY, TENSILE PROPERTIES, THERMOSETTING PLASTICS, TRANSLATIONS, VOLUME, ZINC COMPOUNDS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE