Physics of Fluids,
Год журнала:
2024,
Номер
36(11)
Опубликована: Ноя. 1, 2024
This
study
investigates
the
evolution
of
morphology
and
electrical
properties
polypropylene
(PP)/polystyrene
(PS)
blend
nanocomposites
under
controlled
steady
shear
flow.
These
contain
either
few-layer
graphene
(FLG)
or
a
mixture
FLG
multi-walled
carbon
nanotubes
(MWCNT),
prepared
via
conventional
melt-mixing.
Composites
were
created
by
premixing
FLG/MWCNT
with
PP
[PP/PS/FLG
PP/PS/(FLG+MWCNT)]
PS
[PS/PP/FLG
PS/PP/(FLG+MWCNT)]
at
PP/PS
ratio
inducing
co-continuous
morphology.
Results
showed
significant
reduction
in
percolation
threshold
(PT)
for
PS/PP/FLG
composites,
an
81%
decrease
compared
to
PS/FLG.
When
was
premixed
PS,
PT
required
only
2
wt.
%
FLG,
5.9
PP/PS/FLG.
Steady
deformation
disrupted
network
both
PP/PS/FLG
composites.
However,
composites
exhibited
greater
stability
conductivity
lower
concentrations
(above
3
%)
6
%).
The
applied
did
not
affect
blend-based
containing
1
more
FLG.
Additionally,
synergistic
effects
hybrid
on
rheological
PP/PS/(FLG+MWCNT)
PS/PP/(FLG+MWCNT)
evaluated.
incorporation
MWCNT
into
significantly
enhanced
formation
structure,
leading
further
concentration
Specifically,
decreased
from
1–3
while
dropped
Polymer Composites,
Год журнала:
2023,
Номер
45(1), С. 43 - 76
Опубликована: Сен. 22, 2023
Abstract
The
proliferation
of
electronic
devices
and
wireless
communication
in
our
daily
lives
has
led
to
a
significant
increase
electromagnetic
pollution.
This
issue
poses
serious
threat
the
proper
functioning
equipment
as
well
human
health.
Therefore,
investigation
materials
with
superior
interference
(EMI)
shielding
capabilities
garnered
growing
interest.
In
this
paper,
mechanisms
EMI
were
first
introduced
briefly.
It
was
noted
that
development
advanced
involved
adhering
principles
such
minimizing
reflection
loss,
enhancing
absorption
incorporating
multiple
internal
reflections.
construction
properties
traditional
introduced.
Unlike
metal
high
densities
lightweight
conductive
polymer
composites
(CPCs)
have
been
most
promising
materials.
Meanwhile,
carbon‐based
nanofillers
carbon
nanotubes
graphene
nanosheets,
along
two‐dimensional
transition
carbonitrides
MXenes
Ti
3
C
2
T
x
,
emerged
versatile
for
CPCs.
performance
loss
mechanism
CPCs
homogeneous
structure,
segregated
laminated
porous
structure
detail.
could
be
significantly
improved
by
structures
into
same
CPCs,
rational
combination
structures.
Finally,
challenges
trends
applications
discussed.
Highlights
Mechanisms
from
aspect
energy
dissipation.
Structure–property
described.
different
summarized.
Future
Absorption‐dominated
design
emphasized.
Polymer Composites,
Год журнала:
2024,
Номер
45(5), С. 4487 - 4501
Опубликована: Янв. 3, 2024
Abstract
Mechanical
and
electromagnetic
interference
(EMI)
shielding
properties
are
investigated
for
developed
synthesized
green
composite.
The
varying
content
of
kenaf
fiber‐reinforced
high‐density
polyethylene
(HDPE)
composite
has
been
fabricated
using
microwave‐assisted
compression
molding
techniques
with
without
the
addition
multi‐walled
carbon
nanotubes
(MWCNTs).
X
band
range
used
EMI
characterization.
Optimization
mechanical
strength
done
tensile
test,
impact
translaminar
fracture
toughness
test.
Fractography
by
scanning
electron
optical
microscopy
concluded
that
interfacial
adhesion
between
fiber
HDPE
matrix
degree
ductility
primary
governing
factors
change
in
properties.
differential
calorimetry
confirmed
no
crystallization
MWCNTs.
Composite
effect
above
30
dB
along
superior
is
obtained
at
16%
(v/v)
5%
(wt.)
conductive
MWCNTs
possible
application
electronic
equipment
casing,
overhead
bin,
or
unmanned
aerial
vehicles.
Polymer Composites,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 31, 2024
Abstract
A
hetero‐structured
hybrid
was
produced
by
grafting
one‐dimensional
(1D)
amine‐functionalized
multiwalled
carbon
nanotubes
(MWCNTs)
onto
the
basal
plane
of
two‐dimensional
(2D)
graphene
oxide
(GO)
via
an
amine‐epoxy
ring‐opening
reaction,
and
such
further
applied
for
reinforcing
epoxy
composites.
Based
on
this
design,
1D
MWCNTs
anchored
2D
GO
nanosheets
resisted
re‐stacking
while
improved
MWCNTs'
dispersion
state.
Attributing
to
synergistic
effect
MWCNTs,
a
multi‐dimensional
conducting
network
within
matrix
constructed
efficiently
transferred
stress
heat
between
matrix.
When
just
0.5
wt%
hybrids
were
incorporated,
mechanical
properties,
thermal
stability
conductivity
hybrid‐filled
composites
significantly
improved,
compared
with
pure
epoxies.
This
work
gives
promising
method
designing
preparing
polymer
management
protection
applications.
Highlights
consisting
obtained.
Better
GO–MWCNTs
achieved.
in
constructed.
Enhanced
properties
due
MWCNTs.
Structural
performance
maximized.
Polymer Composites,
Год журнала:
2023,
Номер
45(4), С. 3576 - 3590
Опубликована: Дек. 13, 2023
Abstract
This
study
presents
a
comprehensive
numerical
investigation
of
the
electromagnetic
interference
(EMI)
shielding
capabilities
conductive
polymer
nanocomposite
incorporated
with
carbon
nanotubes
(CPNC)
in
X‐band.
The
is
conducted
using
commercial
finite
element
simulation
package,
Ansys
HFSS.
focuses
on
analyzing
EMI
effectiveness
(SE)
CPNC
by
varying
weight
percent
(wt%)
(CNTs),
thickness,
and
shape
material.
Our
outcomes
show
that
SE
increases
wt%
CNTs.
Notably,
maximum
observed
around
~90
dB
due
to
absorption
(SE
A
)
at
4
mm
pallet‐shaped
~180
for
hollow
cylindrical
(22.86
outer
diameter
3
thickness)
2
CNT.
pallet
thickness
exhibits
significant
improvement
~107%
compared
1
mm.
These
findings
highlight
exceptional
lightweight
nature
CPNC,
rendering
it
promising
material
aerospace
satellite
communication
applications.
Highlights
CNT
polypyrrole
(PPy)
matrix.
percolation
threshold
low
concentration
Thickness
influences
CPNC.
provides
absorption‐dominated
shielding.
Polymer Composites,
Год журнала:
2023,
Номер
45(3), С. 2253 - 2267
Опубликована: Ноя. 15, 2023
Abstract
The
construction
of
effective
conductive
networks
can
enhance
the
electromagnetic
interference
(EMI)
shielding
performance
polymer
composites
(CPCs).
Herein,
poly
(
l
‐lactide)
(PLLA)
micro‐particles
were
used
as
a
volume‐occupying
phase
to
design
and
prepare
PLLA/polydimethylsiloxane/multi‐walled
carbon
nanotubes
(PLLA/PDMS/MWCNT)
with
honeycomb‐like
networks.
interfacial
morphology
was
adjusted
by
changing
surface
PLLA
micro‐particles.
effects
particle
size
on
EMI
effectiveness
(SE)
investigated
in
this
study.
results
indicate
that
regular
shape
rough
effectively
improve
PLLA/PDMS/MWCNT
same
filler
loadings
Specifically,
SE
etched
300‐μm
spherical
achieve
35.1
dB,
which
is
15%
higher
than
30.6
dB
for
irregular
In
addition,
R
values
are
below
0.5,
indicating
absorption
dominated
mechanism.
Highlights
Micro‐particle
tunes
structure
samples.
Micro‐particles
different
sizes
endow
composites.
Samples
have
ones.
samples
highest
SE.
show
an
absorption‐dominated
