Abstract

Frequency dependent dielectric measurements (FDEMS) provide a sensitive, automated in situ sensor for intelligent processing and an in situ means for monitoring durability, that is degradation of polymers during use. FDEMS in situ sensors can be designed and calibrated to monitor changes in processing properties during fabrication and changes in mechanical or electrical service life properties of polymer materials during use. With a proper understanding of the type of polymer and the use environment, the sensor output can be related to changes in modulus, maximum load and elongation at break. The FDEMS technique has advantages over other monitoring techniques: nondestructive; accuracy/reproductivity; sensitivity; in situ capability; remote sensing; automated.

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