Аутори:
1. Иван Петронијевић, Универзитет у Београду, Физички факултет, Студентски трг 12, Београд, Serbia
2. Драгана Церовић, University of Belgrade, Faculty of Physics, Serbia
3. Славица Малетић, Универзитет у Београду, Физички факултет, Студентски трг 12, Београд, Serbia
4. Марија Шуљагић, University of Belgrade, Faculty of Technology and Metallurgy, , Serbia
5. Филип Маринковић, Универзитет у Београду, Физички факултет, Студентски трг 12, Београд, Serbia
6. Dušan Popović, Универзитет у Београду, Физички факултет, Студентски трг 12, Београд, Serbia
7. Duško Dudić, Department of Chemistry, University of the Free State, Private Bag X13, Phuthaditjhaba, 9866 South A, Serbia

Апстракт:
Nowadays demands towards electrical energy storage demands are great. However, present batteries have many disadvantages. Tendencies in science and technology are to overcome these problems by the application of new materials for this purpose. Blends of iPP/paraffin wax (80/20 and 90/10 weight ratio) were processed by plastograph and then foils were obtained by compression molding. Blend and neat iPP foils are treated for (24, 72, and 168) hours in a saturated water solution of LiCl at room temperature and the +4kV DC potential. Dielectric spectroscopy measurements are conducted. Specific conductivity, loss tangent, and relative dielectric constant are studied. It is noticed that blend samples with 10% and 20% paraffin wax have higher specific conductivity in comparison with iPP samples in a whole measured frequency range. The higher percentage of wax greatly influences specific conductivity rise by order of magnitude comparing treated iPP with 80/20 treated blend. All untreated samples (0, 10, 20) wax percentage has lower specific conductivity values compared to treated ones (0, 10, 20) in the whole frequency range, probably due to the incorporation of ions into samples during the treatment. Loss tangent has similar trends which are expected due to leakage currents observed by specific conductivity spectrums. Time of treatment has shown no significant changes or trends of dielectric parameters. Relative dielectric constant showed that treatment with positive DC potential influenced its value since treated samples had significant changes compared to untreated ones especially the 80/20 iPP/paraffine wax blend sample, considering that the value relative dielectric constant of paraffine wax is similar or lower than the value of iPP. Also, relaxation on this spectrum is clearly visible.

Кључне речи:
isotactic polypropylene, paraffine wax, dielectric spectroscopy, LiCl, salt water solution treatment, DC potential

Тематска област:
СИМПОЗИЈУМ А - Наука материје, кондензоване материје и физикa чврстог стања

Датум пријаве сажетка:
28.06.2024.

Конференцијa:
Contemporary Materials 2024 - Savremeni Materijali