Show simple item record

AuthorŠpitalský, Zdenk
AuthorKratochvíla, Ján
AuthorCsomorová, Katarína
AuthorKrupa, Igor
AuthorGraça, Manuel P. F.
AuthorCosta, Luis C.
Available date2022-05-31T19:01:32Z
Publication Date2015
Publication NameJournal of Nanomaterials
ResourceScopus
Identifierhttp://dx.doi.org/10.1155/2015/168485
URIhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84939826019&doi=http://dx.doi.org/10.1155%2f2015%2f168485&partnerID=40&md5=004e9014a4949482e039fca2f0785b16
URIhttp://hdl.handle.net/10576/31891
AbstractThe molecular dynamics of a triblock copolymer and of expanded graphite nanoplatelets were investigated. Composites were prepared using the solution technique. The effects of filler addition and of filler-matrix 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.
Languageen
PublisherHindawi Publishing Corporation
SubjectActivation energy
Dielectric relaxation
Dynamic mechanical analysis
Elastic moduli
Fillers
Graphite
Molecular dynamics
Permittivity
Solvents
Styrene
DC electrical conductivity
Dielectric permittivities
Dielectric relaxation spectroscopy
Dynamic mechanical analysis (DMA)
Electrical percolation threshold
Filler-matrix interaction
Mechanical and electrical properties
Styrene-isoprene-styrene copolymers
Electric variables measurement
TitleMechanical and Electrical Properties of Styrene-Isoprene-Styrene Copolymer Doped with Expanded Graphite Nanoplatelets
TypeArticle
Volume Number2015
dc.accessType Abstract Only


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record