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AuthorGreenhoe, Brian M.
AuthorHassan, Mohammad K.
AuthorWiggins, Jeffrey S.
AuthorMauritz, Kenneth A.
Available date2021-06-07T09:59:14Z
Publication Date2016
Publication NameJournal of Polymer Science, Part B: Polymer Physics
ResourceScopus
URIhttp://dx.doi.org/10.1002/polb.24121
URIhttp://hdl.handle.net/10576/20535
AbstractThe Jonscher universal power law for ac conductivity versus frequency (f = /2) in the dispersion region was tested for a multiwall carbon nanotube/epoxy nanocomposite. The effect of changes in agglomerate morphology on the fitting parameters A and n in the equation ?ac = A?n was investigated. Changing nanotube agglomerate morphology was tracked by optical microscopy through curing. Evolving morphology was compared alongside ac conductivity obtained via a broadband dielectric spectrometer to elucidate possible physical meaning of the universal power law in the context of this system. The ?logA/n was unaffected by changes in agglomerate morphology affected during cure, yet connected with each other in their dependence on temperature. For this system, the relationship between the fitting parameters in the universal dynamic response equation remains empirical at this stage with regard to biphasic texture or morphology within such a network. Electrical conductivity ? versus frequency ? for a composite consisting of agglomerated multiwalled carbon nanotubes dispersed throughout a cured epoxy matrix was discovered to follow the empirical universal dynamic response equation of Jonscher. The frequency behavior of the exponent n is discussed in terms of underlying morphology throughout which charge carriers migrate.
Languageen
PublisherJohn Wiley and Sons Inc.
SubjectCarbon nanotubes
Curing
Dynamic response
Morphology
Nanotubes
Spectrometers
Yarn
Broad-band dielectric spectroscopy
Conductive carbon nanotubes
Dielectric spectrometers
Electrical conductivity
epoxy
Nanotube agglomerates
Power-law
Universal power law
Multiwalled carbon nanotubes (MWCN)
TitleUniversal power law behavior of the AC conductivity versus frequency of agglomerate morphologies in conductive carbon nanotube-reinforced epoxy networks
TypeArticle
Pagination1918-1923
Issue Number19
Volume Number54
dc.accessType Abstract Only


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