Electrical Properties of Polylactalic Acid Composite Films Cover Image
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Електрични свойства на композитни филми от полимлечна киселина
Electrical Properties of Polylactalic Acid Composite Films

Author(s): Asya Petrova Viraneva, Ivan Bodurov, Temenuzhka Yovcheva
Subject(s): Social Sciences, Education, Essay|Book Review |Scientific Life, Vocational Education, Higher Education , History of Education, Educational Psychology, Scientific Life, Conference Report
Published by: Национално издателство за образование и наука „Аз-буки“
Keywords: polylactic acid; corona discharge; electrets

Summary/Abstract: In the present study, some electrical properties of polylactic acid (PLA) composite films with different percentages of MgO – 0 wt%, 2 wt%, 4 wt% and 8 wt% were investigated. Composite films were prepared using a Brabender Plastograph EC Plus blender under controlled electric heating for 5 minutes at 190 ° C. The films obtained were charged by the corona discharge method using a tri-electrode system for 1 minute under room conditions. Positive or negative 5kV voltage was applied to the corona electrode. 1 kV voltage of the same polarity as that of the corona electrode was applied to the grid. The surface potential of the charged samples was measured by the vibrating electrode method with compensation. The time dependencies of surface potential were investigated. The results obtained show a significant change in the electret behavior of PLA composite films after insertion of MgO particles with different concentration. Some dielectric and impedance characteristics of composite films were also studied. Dielectric permittivity was calculated. The results obtained show a change in dielectric permittivity by increasing the concentration of the inserted MgO particles in the PLA matrix.

  • Issue Year: 27/2018
  • Issue No: 4
  • Page Range: 589-597
  • Page Count: 9
  • Language: Bulgarian