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Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"BARBARA GÓRNICKA"

» Surface morphology study and dielectric properties of polyesterimide nanocomposite

BARBARA GÓRNICKA

ANDRZEJ SIKORA

DAMIAN WOJCIESZAK

It is now well known that nano-structuring of composites affect significantly on their dielectric properties as well the surface morphology [1-6]. On the other hand, the new generation of dielectrics, i.e. polymers modified with nanofillers, due to their special structure may influence on a better understanding of the phenomena that appear in dielectrics [1]. The polyesterimide impregnating varnish (T) have been modified by incorporation of hydrophilic fumed nanosilica (SiO2) at a low loading (1.5% by weight) using our special method. The influence of nanostructuring of composites on the thermally stimulated depolarization currents, temperature characteristic of tan δ and partial discharges resistance as well the nanoscale surface morphology were investigated. Experimental The thermally stimulated depolarization current (TSDC), partial discharge (PD) resistance, temperature characteristic of tan δ and surface morphology have been investigated for both pure (T) and nanofilled (T+ SiO2) varnishes. In the thermally stimulated depolarization current (TSDC) investigation at 120oC, a static voltage 100 V and 200 V was applied to a sample for a time 40 minutes and then temperature was decreased for a time 20 min to ambient temperature. The voltage was switched off and the sample was shortcircuited for a time 30 min to eliminate the rapid space charge relaxation and stabilize the sample. Then during a linear temperature increase 2 oC/min, the return to equilibrium of the previously oriented charges generated a depolarization current which was recorded, as a function of temperature, with a electrometer (Keithley 6517[...] więcej»
w zeszycie ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA 2011/3

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