International Journal of Applied Mechanics,
Год журнала:
2024,
Номер
16(03)
Опубликована: Янв. 27, 2024
In
recent
years,
researchers
have
shown
interest
in
using
elastomers
with
high
dielectric
constant
and
good
elasticity
capacitive
MEMS.
This
paper
aims
to
investigate
how
the
performance
of
sensors/actuators
is
affected
by
temperature-dependent
behavior
gap-filling
Polydimethylsiloxane
(PDMS).
As
a
case
study,
model
created,
consisting
proof
mass
two
attached
flexible
microbeams
parallel
stationary
electrode,
under
electrostatic
actuation.
The
actuation
directly
proportional
constant.
To
reduce
resistance
stiffness,
bulk
PDMS
was
assumed
porosity,
resulting
nonlinear
displacement-dependent
Young’s
modulus.
system’s
static
dynamic
responses
were
obtained
solving
governing
equations
Galerkin-based
numerical
procedures.
Additionally,
physically
gradient-descent-based
learning
method
used
predict
frequency
response
system.
results
that
instead
an
air
gap
significantly
reduces
required
voltage,
although
this
difference
less
pronounced
at
higher
temperatures.
addition,
inclusion
alters
resonance
system
also
reducing
temperature
diminishes
softening
specific
bias
AC
voltages.
Industrial Crops and Products,
Год журнала:
2024,
Номер
212, С. 118354 - 118354
Опубликована: Март 9, 2024
This
study
aimed
to
develop
new
biobased
materials
containing
plasticized
cellulose
acetate
(CA)
by
Fused
Filament
Fabrication
(FFF).
We
investigated
the
influence
of
CA
on
viscoelastic/dielectric
properties
and
3D
printing
dielectric
polymer
blends.
A
microstructural
analysis
showed
that
blends
had
a
strong
heterogeneous
morphology,
as
two
phases
formed
fibrillar
lamellar
structure.
strongly
increased
blend
viscosity
at
175
°C,
multiplying
100
times
complex
between
neat
PLA
40%
weight
(CA-40).
The
addition
constant
(ε')
loss
(ε''),
well
alternative
current
electrical
conductivity
(σAC).
(ε'CA)
was
proportional
its
percentage
in
blend,
showing
behavior
analogous
rule
mixture.
Moreover,
activation
energy
(σDC)
measured
T
>
124
°C
decreased
with
increasing
content
associated
enhancement
ionic
provided
plasticizer.
decrease
α-relaxation
temperature
also
linked
presence
Finally,
greatly
both
ε',
ε''
σAC
due
internal
voids
induced
process.
porosity
12%
for
20%
25%
These
results
advantage
FFF
technology
production
PLA:CA
controlled
properties,
thereby
favoring
use
these
key
areas.
Materials,
Год журнала:
2025,
Номер
18(1), С. 198 - 198
Опубликована: Янв. 5, 2025
The
dielectric
properties
of
polymers
play
a
pivotal
role
in
the
development
advanced
materials
for
energy
storage,
electronics,
and
insulation.
This
review
comprehensively
explores
critical
relationship
between
polymer
chain
conformation,
nanostructure,
properties,
focusing
on
parameters
such
as
constant,
loss,
breakdown
strength.
It
highlights
how
factors
like
rigidity,
free
volume,
molecular
alignment,
interfacial
effects
significantly
influence
performance.
Special
emphasis
is
placed
impact
nanofillers,
weight,
crystallinity,
multilayer
structures
optimizing
these
properties.
By
synthesizing
findings
from
recent
experimental
theoretical
studies,
this
identifies
strategies
to
enhance
efficiency,
reliability,
mechanical
stability
polymer-based
dielectrics.
We
also
delve
into
techniques
electrostatic
force
microscopy
(EFM)
focused
ion
beam
(FIB)
milling
characterizing
mechanisms,
offering
insights
design
next-generation
high-performance
polymers.
Despite
considerable
progress,
challenges
achieving
an
optimal
balance
permittivity
strength,
understanding
nanoscale
phenomena,
scaling
industrial
applications
persist.
These
gaps
can
be
addressed
by
systematic
structure–property
relations,
processing
techniques,
environmental
studies.
Polymers,
Год журнала:
2025,
Номер
17(6), С. 753 - 753
Опубликована: Март 13, 2025
Polyimide-based
dielectric
materials,
as
excellent
high-temperature-resistant
polymers,
play
a
crucial
role
in
advanced
electronic
devices
and
power
systems.
However,
given
the
limitations
of
composite
PI
it
is
significant
challenge
to
simultaneously
improve
constant
breakdown
strength
intrinsic
polyimide
materials
achieve
high
energy
density.
In
this
study,
an
indiscriminate
copolymerization
method
was
proposed,
which
utilizes
two
different
diamine
monomers
with
bulky
side
groups
(-CF3)
polarity
(C-O-C),
respectively,
copolymerize
same
dianhydride
monomer
prepare
series
films.
Remarkably,
films
highly
dipolar
rigid
backbone
maintain
thermal
mechanical
properties
while
enhancing
dipole
polarization.
Meanwhile,
shown,
because
act
deep
traps
capture
disperse
charges
during
charge
transfer
process.
Under
optimal
copolymer
ratio,
loss
are
4.2
0.008,
respectively.
At
room
temperature,
highest
reaches
493MV/m,
storage
density
charge–discharge
efficiency
5.07
J/cm3
82%,
Finally,
based
on
functional
theory
calculations,
tendencies
three
verified,
speculated
that
ratio
PI-60%
most
stable
exhibits
best
overall
performance,
perfectly
aligns
experimental
results.
These
results
demonstrate
exciting
potential
thin
film
capacitors.
International Journal of Smart and Nano Materials,
Год журнала:
2024,
Номер
15(1), С. 110 - 126
Опубликована: Янв. 2, 2024
Elastomers
are
widely
used
in
electronics
and
electrical
devices,
either
as
insulators
or
transducers.
The
insulation
actuation
performance
of
elastomers
highly
susceptible
to
their
dielectric
strength.
Among
the
factors
that
influence
strength
elastomers,
material
viscoelasticity
is
an
important
factor
needs
further
investigation.
Since
often
characterized
by
rate-dependent
behaviors,
we
present
two
different
sample
configurations
experimentally
examine
mechanical
rate
dependence
VHB
4905
elastomers.
At
pre-stretch
ratio
4,
improvement
about
30%
from
voltage
ramp
50
V/s
800
V/s.
Particularly,
with
in-house
biaxial
test
platform,
effect
stretching
on
examined
for
first
time.
35%
0.1
mm/s
5
mm/s.
Moreover,
a
predictor
based
configurational
stress
adopted
describe
experimental
data.
According
predictor,
loading
affects
elastomer
mainly
influencing
evolution
inelastic
deformation.
