Covalent
adaptable
networks
are
frequently
studied
as
alternatives
to
conventional
thermosetting
polymers
because
they
can
be
recycled
and
reprocessed;
however,
the
inclusion
of
dynamic
covalent
bonds
within
high-temperature
(or
high-performance)
engineering
thermoplastics
remains
largely
unexplored.
In
this
work,
disulfide-containing
thermoplastic
polyimides
were
synthesized
compared
nondynamic
polyimides.
The
thermomechanical
properties
these
examined
by
utilizing
several
techniques,
including
thermogravimetric
analysis,
differential
scanning
calorimetry,
along
with
use
rheometric
quartz
crystal
microbalance,
traditional
mechanical
analysis.
resulting
experimental
data
suggest
that
thermal
stability
compositions
was
slightly
reduced
in
comparison
analogs,
but
exhibit
a
similar
response
under
service
conditions.
also
demonstrated
significantly
easier
reprocessability
via
compression
molding
than
their
counterparts.
Advanced Materials,
Год журнала:
2023,
Номер
35(46)
Опубликована: Авг. 3, 2023
Abstract
The
growing
need
for
high‐power
and
compact‐size
energy
storage
in
modern
electronic
electrical
systems
demands
polymer
film
capacitors
with
excellent
temperature
capability.
However,
conventional
dielectrics
feature
dramatic
deterioration
capacitive
performance
under
concurrent
high
electric
field
because
the
thermal
stability
traditionally
relies
on
conjugated,
planar
molecular
segments
chains.
Herein,
inspired
by
stable
double
helix
structures
of
deoxyribonucleic
acid,
spiral‐structured
dielectric
polymers
that
exhibit
simultaneous
great
are
demonstrated.
Both
experimental
results
computational
simulations
confirm
spiral
groups
serve
to
weaken
electrostatic
interaction,
induce
proper
chain
stacking
structure,
regulate
charge
transfer
process
breaking
conjugated
planes
introducing
deep
trap
sites.
resultant
exhibits
maximum
discharged
densities
7.29
6.13
J
cm
−3
charge–discharge
efficiency
above
90%
at
150
200
°C,
respectively,
more
than
ten
times
those
original
same
conditions.
Here
a
completely
new
dimension
is
offered
design
polymers,
giving
rise
well‐balanced
properties,
ultimately
desired
temperatures.
Chemical Reviews,
Год журнала:
2024,
Номер
124(12), С. 7674 - 7711
Опубликована: Июнь 7, 2024
The
development
of
microelectronics
and
large-scale
intelligence
nowadays
promotes
the
integration,
miniaturization,
multifunctionality
electronic
devices
but
also
leads
to
increment
signal
transmission
delays,
crosstalk,
energy
consumption.
exploitation
materials
with
low
permittivity
(low-
Applied Physics Letters,
Год журнала:
2025,
Номер
126(5)
Опубликована: Фев. 3, 2025
Dielectric
polymers
for
electrostatic
energy
storage
are
used
in
modern
electronic
and
electrical
systems,
their
performance
can
be
significantly
enhanced
through
doping
with
ultralow
content
nanofillers
to
improve
performance.
Understanding
the
underlying
physical
mechanisms
of
polymer
nanocomposites
is
essential
designing
high-performance
dielectric
polymers.
This
paper
presents
a
conduction
model
that
integrates
Richardson–Schottky
emission
hopping
describe
charge
injection
transport
composites.
Phase-field
simulations,
incorporating
electrical,
thermal,
mechanical
breakdown
mechanisms,
investigate
influence
nanofiller
volume
fraction,
size,
constant
on
response
behaviors
under
high
temperature
electric
fields.
We
propose
Physics-Informed
Neural
Networks
phase-field
simulation
rules
transport,
phase
evolution,
boundary
conditions.
By
embedding
field
models
within
Networks'
structure,
this
method
demonstrates
ability
predict
strength
density
nanocomposites.
work
provides
crucial
guidelines
capacitors
extreme
Advanced Materials,
Год журнала:
2023,
Номер
unknown
Опубликована: Июнь 29, 2023
Abstract
Polyimides
(PIs)
used
in
advanced
electrical
and
electronic
devices
can
be
electrically/mechanically
damaged,
resulting
a
significant
waste
of
resources.
Closed‐loop
chemical
recycling
may
prolong
the
service
life
synthetic
polymers.
However,
design
dynamic
covalent
bonds
for
preparing
chemically
recyclable
crosslinked
PIs
remains
challenging
task.
Herein,
new
PI
films
containing
oligomer,
chain
extender,
crosslinker
are
reported.
They
exhibit
superior
recyclability
excellent
self‐healable
ability
owing
to
synergistic
effect
extender
crosslinker.
The
produced
completely
depolymerized
an
acidic
solution
at
ambient
temperature,
leading
efficient
monomer
recovery.
recovered
monomers
remanufacture
without
deteriorating
their
original
performance.
In
particular,
designed
serve
as
corona‐resistant
with
recovery
rate
approximately
100%.
Furthermore,
carbon
fiber
reinforced
composites
(CFRCs)
matrices
suitable
harsh
environments
recycled
multiple
times
non‐destructive
up
preparation
high‐strength
adaptable
hybrid
from
simple
oligomers,
extenders,
crosslinkers
provide
solid
basis
sustainable
development
fields.
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 14, 2024
Abstract
Polymer
dielectrics
with
combined
thermal
stability
and
self‐healing
properties
are
specifically
desired
for
high‐temperature
film
capacitors.
The
high
of
conventional
polymers
benefits
from
the
abundance
aromatic
rings
in
molecule
backbone,
but
carbon
content
sacrifices
their
properties.
Here,
analicyclic
polyimide
a
glass
transition
temperature
(256
°C)
wide
energy
bandgap
(4.58
eV)
is
designed,
which
exhibits
electric
conductivity
more
than
an
order
magnitude
lower
that
classical
at
fields
temperatures.
As
result,
alicyclic
achieves
discharged
density
4.54
J
cm
−3
charge‐discharge
efficiency
above
90%
200
°C,
superior
to
existing
dielectric
composites.
low
pyrolytic
residual
rate,
retaining
93%
breakdown
strength
after
four
electrical
cycles.
Distinguishing
current
condensed‐phase
concept,
first
time,
exploring
capability
presented
based
on
dual
mechanisms
gas‐phase
condensed‐phase.
temperatures
further
indicate
promise
capacitors
extreme
conditions.
Cell Reports Physical Science,
Год журнала:
2024,
Номер
5(6), С. 102025 - 102025
Опубликована: Июнь 1, 2024
Extensive
efforts
have
been
made
to
improve
the
output
performance
of
triboelectricity-based
mechanical-to-electrical
energy
generators
(TBMEGs).
However,
existing
improvement
strategies
roughly
treat
various
dielectrics
as
ideal
capacitor
models
in
charge
storage
and
release,
restricting
enhancement
TBMEGs
owing
neglect
electric
displacement
response
characteristics
dielectrics.
Herein,
an
displacement-internal
field
modulation
strategy
is
proposed
for
that
are
actually
non-ideal
capacitors,
which
fully
exploits
their
gain-of-function
effects
by
synergistically
boosting
surface
electrostatic
polarization
change
discharge
energy.
As
a
proof-of-concept
demonstration,
elaborate
dielectric
consisting
polydimethylsiloxane-filled
submicron
interconnected
lead
zirconate
titanate
skeletons
shows
good
results.
The
corresponding
TBMEG
delivers
high
outputs
203.3
μC
m−2
27.6
mJ
m−2,
realizing
330%
compared
classical
model
strategy.
These
findings
provide
more
practical
insights
into
composed
capacitive
Advanced Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 12, 2025
Abstract
Polyimide
(PI)
is
a
promising
engineering
plastic
but
difficult
to
recycle
due
its
aromatic
heterocyclic
structures,
especially
for
thermosetting
PI.
Herein,
an
ingenious
cascade
pathway
high‐value
and
full
recovery
of
PI
under
mild
conditions
presented.
Specifically,
the
imide
ring
first
broken
through
aminolysis
degrade
reconstructed
following
hydrolysis
achieve
excellent
thermal
stability
in
subsequent
products.
When
recycling
thermoplastic
PI,
yield
91%
82%
appears
diamines
polyhydroxylated
compounds,
respectively.
As
focusing
on
aside
from
efficient
diamines,
crosslinked
component
converted
into
hyperbranched
flame
retardant
carbonizers
preparing
copolyester,
it
correspondingly
achieves
good
effect
with
addition
merely
4
wt.%.
The
success
this
work
capitalizes
unique
structure
properties
raw
material,
stimulating
innovative
pathways
field
thermoset
waste
new
material
design.
