Interfacial effects on dielectric properties of polymethylmethacrylate-titania microcomposites and nanocomposites
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http://dx.doi.org/10.1002/pc.23679 |
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Title
Interfacial effects on dielectric properties of polymethylmethacrylate-titania microcomposites and nanocompositesDate
2015Publisher
WileyISSN
0272-8397; 1548-0569Bibliographic citation
Javadi, S., Razzaghi-Kashani, M., Reis, P.N.B. and Balado, A.A. (2015), Interfacial effects on dielectric properties of polymethylmethacrylate-titania microcomposites and nanocomposites. Polym Compos. doi: 10.1002/pc.23679Type
info:eu-repo/semantics/articlePublisher version
http://onlinelibrary.wiley.com/doi/10.1002/pc.23679/abstractVersion
info:eu-repo/semantics/publishedVersionAbstract
It is discussed that dielectric properties of polymethylmethacrylate
(PMMA) composites are influenced by
the particle size of titania as a result of changes in the
structure and dynamics of polymer chains in the ... [+]
It is discussed that dielectric properties of polymethylmethacrylate
(PMMA) composites are influenced by
the particle size of titania as a result of changes in the
structure and dynamics of polymer chains in the interphase
regions around the particles. It is hypothesized
that a loosely packed interphase layer, resulted from
high stiffness and high cohesion energy of PMMA
chains, provides enough free volume for segmental
chain movements and dipole orientation along the
applied electric field and causes an increase in dielectric
properties of nanocomposites at low filler contents.
It is shown that the attraction of PMMA towards
micro-titania and nano-titania is similar by measuring
the surface energy of fillers. Dynamics of polymer
chains around fillers is investigated by dynamicmechanical-thermal
analysis and broadband-dielectric
spectroscopy, and presence of a loosely packed layer
is confirmed by measuring thermal and mechanical
glass transition temperature of composites. It is concluded
that the anomalous enhancement in dielectric
properties of 2 vol% nanocomposite, compared to the
corresponding microcomposite, can be attributed to
the higher volume fraction of loosely packed interphase
layers in the nanocomposite. POLYM. COMPOS.,
00:000–000, 2015. VC 2015 Society of Plastics Engineers [-]
Is part of
Polymer Composites, 2015Rights
Published online in Wiley Online Library (wileyonlinelibrary.com).
© 2015 Society of Plastics Engineers
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