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The effects of filler addition and of filler\u2010matrix interactions were investigated using dielectric relaxation spectroscopy (DRS) and dynamic mechanical analysis (DMA). Only one relaxation was observed by DRS, which was associated with the relaxation of the main polymer chain. Both DRS and DMA demonstrated that the addition of the filler does not cause a significant change in either the temperature of the relaxation or its activation energy, which suggests the presence of weak interactions between the filler and matrix. The storage modulus of the composites increased with increasing filler content. The composite containing 8% filler exhibited a storage modulus increase of approximately 394% in the rubber area. Using the DC electrical conductivity measurements, the electrical percolation threshold was determined to be approximately 5%. The dielectric permittivity and conductivity in the microwave region were determined, confirming that percolating behavior and the critical threshold concentration.<\/jats:p>","DOI":"10.1155\/2015\/168485","type":"journal-article","created":{"date-parts":[[2015,8,6]],"date-time":"2015-08-06T21:07:35Z","timestamp":1438895255000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Mechanical and Electrical Properties of Styrene\u2010Isoprene\u2010Styrene Copolymer Doped with Expanded Graphite Nanoplatelets"],"prefix":"10.1155","volume":"2015","author":[{"given":"Zdenko","family":"\u0160pitalsk\u00fd","sequence":"first","affiliation":[]},{"given":"J\u00e1n","family":"Kratochv\u00edla","sequence":"additional","affiliation":[]},{"given":"Katar\u00edna","family":"Csomorov\u00e1","sequence":"additional","affiliation":[]},{"given":"Igor","family":"Krupa","sequence":"additional","affiliation":[]},{"given":"Manuel P. 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