Abstract
Polyester—imide prepolymers containing synthesized N,N′-bis(hydroxyethyl)pyromellitic diimide (PMDI) or N,N′-bis(hydroxyethyl)-3,3′-4,4′-benzophenone tetracarboxylic diimide (BTDI) were synthesized under conditions previously reported. One-component varnishes were obtained by mixing the synthesized prepolymers with commercial Desmodur CT-stable. Thermal behavior of these varnishes was investigated using thermogravimetric analysis. Activation energy of cured film, which was a polyester—imide varnish, was determined by using a multiple heating rate method. Polyester—imides coated copper wires were characterized, and were found to be acceptable, according to the specification of Japanese Industrial Standard (JIS-C-3214).
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