MULTI-WALLED CARBON NANOTUBE EFFECT ON DIELECTRIC PROPERTIES OF POLYMER MATRICES

Autor/autori: Vlad-Andrei SCARLATACHE, Romeo Cristian CIOBANU, Massimo PASQUALE (Italia), Andrei PRUTEANU

Rezumat: Aceasta lucrare prezinta analiza dieletrica a unei mostre de material compozit pe baza de polipropilena (PP) cu insertii de fibre de nanotuburi de carbon multistrat (MWNT). Cu ajutorul analizorului de impedanta 4294A furnizat de catre Agilent si a fixturii 16451B pentru teste dielectrice asupra materialelor, au fost masurate permitivitatea reala, permitivitatea imaginara, factorul de pierderi dielectrice si conductivitatea materialului compozit pe baza de PP cu insertii de MWNT cu un procent de 5% din totalul volumului. S-a urmarit in principal efectul polarizarii electrice asupra proprietatilor dielectrice ale materialului si asupra conductivitatii acestuia in functie de evolutia frecventei in domeniul 40 Hz ÷ 15 MHz. In procesul de masurare s-au utilizat doua metode, si anume metoda prin contact direct si metoda fara contact.

Cuvinte cheie: analiza dielectrica, polarizare electrica

Abstract: This paper presents dielectric analysis of a composites material sample, based on polipropilen (PP) with insertion filers of multi-walled carbon nanotube (MWNT). Using impedance analyzer Agilent 4294A and dielectric test fixture 16451B, were measured real and imaginary permittivity, dielectric loss factor and conductivity of composite material based on PP inserts MWNT with a rate of 5 % of total volume. The aim was mainly the effect of electric polarization on the dielectric properties of the material and its conductivity to a change in frequency of 40 Hz to 15 MHz. In the measurement proces we used two methods, namely Contacting Electrode Method and Non-contacting Electrode Method (Air Gap Method).

Keywords: dielectric analysis, electric polarization

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