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Download fileEffect of Processing Techniques on EMI SE of Immiscible PS/PMMA Blends Containing MWCNT: Enhanced Intertube and Interphase Scattering
journal contribution
posted on 2019-02-05, 00:00 authored by S. M.
Nourin Sultana, Shital Patangrao Pawar, Uttandaraman SundararajPolystyrene
(PS)/poly(methyl methacrylate) (PMMA)/multiwalled carbon
nanotube (MWCNT) blends are prepared using six different processing
techniques to investigate the effect of processing techniques on electromagnetic
interference shielding effectiveness (EMI SE) of immiscible polymer
blend nanocomposites. Different processing strategies (e.g., sequence
of addition of components) and blend compositions influence final
morphology, selective localization, and dispersion of MWCNT, which
are studied by SEM and TEM analysis. We achieved increased EMI SE
in polymer blend nanocomposites through multiple scattering (selective
localization-assisted interphase and better dispersion-aided intertube
scattering), unlike traditional metal shields, which mostly depend
on reflection. PS/PMMA(20:80) and PS/PMMA(80:20) blend nanocomposites
with 2.7 vol % MWCNT made by one-step solution mixing exhibited 22
and 21 dB EMI SE at 0.8 mm thickness. EMI SE is found to increase
with composite thickness. Immiscible polymer blend nanocomposites
display a higher rate of increase in EMI SE with an increase in thickness
compared to single polymer nanocomposites. This increased rate of
EMI SE in blend nanocomposites is attributed to the synergistic effect
of interphase scattering and intertube scattering, whereas only intertube
scattering plays a role in single polymer nanocomposites. The PS/PMMA(80:20)
blend nanocomposite with 2.7 vol % MWCNT shows 30 dB EMI SE at 2 mm
thickness. This work shows the impact of multiple scattering on enhancing
EMI SE in microphase-separated polymer blend nanocomposites.
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Keywords
Interphase Scattering PolystyreneMWCNTimmiscible polymer blend nanocompositesblend compositions influencePMMAPSpolymer blend nanocomposites30 dB EMI SEDifferent processing strategiesprocessing techniquesEMI SEmicrophase-separated polymer blend nanocompositesTEM2 mm thicknesspolymer nanocompositesImmiscible polymer blend nanocomposites displaySEM21 dB EMI SE0.8 mm thicknesselectromagnetic interference shielding effectiveness