ASSESMENT OF THERMAL ENDURANCE OF NANOFILLED POLYESTERIMIDE VARNISH
Journal Title: Proceedings of Electrotechnical Institute Prace Instytutu Elektrotechniki - Year 2012, Vol 59, Issue 259
Abstract
The initial results of long-term thermal ageing of nanofilled polyesterimide varnish contained 1.5% fumed nanosilica are presented. The criteria of varnish thermal degradation according UL, i.e. the bond strength level and positive result of voltage proof were assumed. In addition, the thermogravimetric TG investigations under isothermal condition have been performed. At the aging temperatures lifetimes of nanofilled varnish is longer than that for the pure varnish when an electrical criterion is applied. The bond strength after a long-lasting ageing is also much greater for nanocomposite. The TG investigations show that mass loss of nanocomposite is less. The obtained results confirmed that thermal endurance of nanofilled varnish is improved with relation to pure varnish. The silica nanoparticles could form a barrier for mass and heat transport and hinder thermal degradation of nanocomposite.
Authors and Affiliations
Barbara GÓRNICKA, Lech GÓRECKI, Katarzyna GRYZŁO
Keywords
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