Effect of mechanical loading on the electrical durability of polymers |
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Authors: | Slutsker A I Veliev T M Alieva I K Alekperov V A Polikarpov Yu I Karov D D |
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Institution: | 1.Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194012, Russia ;2.Institute of Physics, Azerbaijan National Academy of Sciences, Baku, AZ1073, Azerbaijan ;3.Peter the Great St. Petersburg Polytechnic University, St. Petersburg, 195251, Russia ; |
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Abstract: | A decrease in the electrical durability, which is defined as an amount of time required for dielectric breakdown at a constant electric field strength, of polyethylene and Lavsan (polyethylene terephthalate) films under tensile loading is registered in a temperature range from 100 to 300 K. It is established that the pulling apart of the axes of neighbor chain molecules in consequence of tensile loading gives rise to a decrease in the energy level of the intermolecular electron traps. In the amorphous region of a polymer, this accelerates the release of electrons from the traps through over-barrier transitions at higher temperatures ranging from about 230 to 350 K and quantum tunneling transitions at lower temperatures in the range from about 80 to 200 K. As a result, the time required for the formation of a critical space charge, i.e., the waiting period of dielectric breakdown, decreases, which means a reduction in the electrical durability of polymers. |
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