Accession Number : ADA191266

Title :   Electrical D. C. Conductivity of Pitch.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA MATERIALS SCIENCES LAB

Personal Author(s) : Gold, Phillip I

PDF Url : ADA191266

Report Date : 30 Oct 1987

Pagination or Media Count : 25

Abstract : Untreated A240 pitch was thermally cycled to 450 C at rates of 5 C/min, 1 C/min, and 5 C/hr. The electric (d.c.) conductivity measured during both heating and cooling portions of the cycle displayed a hysteresis effect resulting from volatilization of lower molecular weight components, polymerization, and mesophase formation. The heating curve obeyed an Arrhenius relation at low temperatures below the onset of significant volatilization, while the cooling curve was observed to follow an Arrhenius relation at all temperatures. Keywords: Pitch, Electrical conductivity, Mesophase, Activation energy, and Rheology.

Descriptors :   *ELECTRICAL CONDUCTIVITY, *HYSTERESIS, *MOLECULAR WEIGHT, *POLYMERIZATION, *RHEOLOGY, *VOLATILITY, ACTIVATION ENERGY, ARRHENIUS EQUATION, CONDUCTIVITY, COOLING, ELECTRICAL PROPERTIES, GRAPHS, HEATING, LIGHTWEIGHT, LOW TEMPERATURE, PHASE, PITCH(MOTION), TEMPERATURE

Subject Categories : Electricity and Magnetism
      Miscellaneous Materials
      Atomic and Molecular Physics and Spectroscopy
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE