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PROPERTIES OF THERMOSETTING POLYMERS AS EVIDENCED BY ELECTRICAL RESISTIVITY MEASUREMENTS
NAVAL ORDNANCE LAB WHITE OAK MD
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An investigation of thermosetting polymer properties by electrical volume resistivity techniques is discussed. This approach yielded fundamental data sensitive to the structure of a polymer. It is possible to determine if a polymer is in configurational equilibrium. Explanations are given for the change in resistivity during polymerization, magnitude and temperature dependence of resistivity, glass transition, thermal stability and degradation of crosslinked polymers. For a number of amorphous polymers a linear relationship was found to exist between the logarithm of the magnitude of the resistivity at 25 C and the temperature dependence of the resistivity. The compensation law is observed to hold for the electrical conduction process in amorphous polymers. Evidence is presented which indicates that the glass transition in thermosetting polymers is a time-dependent relaxation process. Author
APPROVED FOR PUBLIC RELEASE