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On the Silica Surface Modification and Its Effect on Charge Trapping and Transport in PP-Based Dielectric Nanocomposites
Version 2 2020-07-31, 18:04
Version 1 2020-07-31, 10:13
journal contribution
posted on 2020-07-31, 18:04 authored by Amirhossein Mahtabani, Ilkka Rytöluoto, Rafal Anyszka, Xiaozhen He, Eetta Saarimäki, Kari Lahti, Mika Paajanen, Wilma Dierkes, Anke BlumeThe
effect of filler surface functionalization with 3-aminopropyltriethoxysilane
(APTES) on the charge trapping and transport was studied in polypropylene
(PP)/(ethylene-octene) copolymer (EOC)/silica nanodielectrics. Different
reaction conditions were utilized for silica functionalization to
alter the deposited layer morphology. This approach made it possible
to engineer the filler–polymer interface to achieve optimized
dielectric properties for the nanocomposites. The successful chemical
modification of the silica surface was confirmed via thermogravimetric
analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), and
X-ray photoelectron spectroscopy (XPS). Subsequently, the effect of
the engineered filler–polymer interface on the nanocomposites’
crystallinity was analyzed with differential scanning calorimetry
(DSC). Scanning electron microscopy (SEM) was utilized to observe
the morphology of the nanocomposite as well as the silica dispersion.
Finally, the effect of the silica functionalization on the dielectric
properties of PP/EOC/silica nanocomposites was tested via thermally
stimulated depolarization current (TSDC) and broadband dielectric
spectroscopy (BDS). The results suggested that the presence of the
amine functionality on the silica reduces interfacial losses in nanocomposites,
and hinders further injection of space charge by introducing deep
trap states at the filler–polymer interface. Under certain
conditions, APTES can form an “island-like” morphology
on the silica surface. These islands can facilitate nucleation, inducing
transcrystallization at the filler–polymer interface. The island-like
structures present on the silica would further contribute to the induction
of deep traps at the filler–polymer interface resulting in
the reduction of space charge injection.
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Keywords
EOCmorphologyFTIRScanning electron microscopynanocompositeXPSsilica functionalizationfiller surface functionalizationAPTESbroadband dielectric spectroscopyX-ray photoelectron spectroscopyBDSinterfaceDSCPP-Based Dielectric Nanocompositesoptimized dielectric propertiesSEMSilica Surface ModificationTSDCTGAsilica surfacespace charge injectionDifferent reaction conditions
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