CONTINUOUS CURRENT MONITORING INSTRUMENTATION FOR ENCAPSULATING RESIN INVESTIGATION
NAVAL ORDNANCE LAB WHITE OAK MD
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A strip electrode sample cell together with continuous current monitoring instrumentation which records graphically the conductivity of an encapsulating resin throughout the curing process is described. This record yields the resistivity of both the unpolymerized and cured resin, and the exponential temperature coefficient s of resistivity. The dielectric constant and loss tangent are readily outlined with standard laboratory apparatus over a frequency range of 60 x 1 x 106 cps. All parameters are measured, in situ, on the same sample. This instrumentation has proved to be useful in estimating the degree of cure, in determining the frequency and temperature dependence of a resins electrical parameters with degree of cure, curing cycle, curing agent, fillers and component loading. Author-PL.