Method and apparatus for in-situ measurement of polymer cure sta

Details Method and apparatus for in-situ measurement of polymer cure sta Method and apparatus for in-situ measurement of polymer cure sta

1997-09-10

1999-02-16

Do, Diep N.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

324637, 324642, G01N 2200, G01R 2704

Patent

active

058724478

ABSTRACT:
An apparatus and a method for determining the cure state of thermosetting polymers using time domain reflectometry. A miniature capacitor is constructed at the end of a coaxial transmission line which is immersed in the curing polymer so that the polymer is the dielectric of the capacitor, and step function voltage pulses are fed to the transmission line, while the reflected signal from the line is monitored. The amplitude and decay characteristics of the reflected signals, which are related to the degree of cure and the viscosity, respectively, are fed to a computer for interpretation and display.

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Carrozzino et al., "Calorimetric and Microwave Dielectric Monitoring of Epoxy Resin Cure", Polymer Engineering and Science, Mar. 1990, vol. 30, No. 6, pp. 366-373.

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