Dielectric properties and molecular mobility of organic/inorganic polymer composites |
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| Authors: | Haralampos Zois Athanasios Kanapitsas Polycarpos Pissis Lazaros Apekis Eugene Lebedev Yevgen P Mamunya |
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| Institution: | 1. National Technical University of Athens, Department of Physics, Zografou Campus, 157 80 Athens, Greece;2. Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, Kharkovskoe shousse 48, Kiev 02160, Ukraine |
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| Abstract: | Microstructure-dielectric properties relationship and molecular mobility of organic/inorganic polymer composites (OIPCs), consisting of polyurethane (PU) and sodium silicate (NaSi), were investigated in this work. Broadband dielectric relaxation spectroscopy (DRS) and thermally stimulated depolarization current (TSDC) techniques were employed. Our interest was focused on the study of the glass transition mechanism and conductivity relaxation. The influence of the molecular weight of PU and inorganic phase content on the dielectric properties of the composites was of particular interest. Glass transition temperature shifts to higher temperatures with the addition of NaSi. The overall molecular mobility was found to increase in the composites, compared to the pure PU matrix. The results are more intense for the composites based on the PU with low molecular weight. |
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| Keywords: | conductivity relaxation dielectric properties glass transition molecular mobility organic/inorganic polymer composites |
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