Polymer Composites,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 30, 2024
Abstract
High
thermal
conductivity
(
λ
)
composite
with
excellent
dielectric,
mechanical,
and
properties
are
critical
to
the
reliability
safety
of
electrical
devices.
However,
excessive
addition
conductive
fillers
may
lead
severe
performance
degradation.
Heterogeneous
structured
alumina‐hexagonal
boron
nitride
nanosheets
(Al
2
O
3
@BNNS)
were
prepared
by
electrostatic
self‐assembly
method.
Owing
synergistic
effect
spherical
Al
sheet
BN,
much
low
interface
resistance,
epoxy
resin
20
wt%
@BNNS
is
raised
0.84
W·m
−1
·K
,
86.67%
higher
than
that
/BN/EP
composite.
Furthermore,
epoxy‐based
polyhedral
oligomeric
silsesquioxane
(EP‐POSS)
was
incorporated
further
optimize
dielectric
property
The
slightly
decreased,
but
constant
loss
reduced
2.954
0.01058,
respectively,
due
unique
cage
structure
EP‐POSS
compatibility
matrix.
also
exhibits
favorable
mechanical
an
impact
strength
86.2
MPa
a
bending
7.81
kJ·m
−2
as
well
outstanding
stability,
suggesting
its
promising
prospects
for
advanced
electronic
Highlights
f
BNNS
self‐assemble
into
heterostructured
fillers.
/EP
others.
cage‐like
used
improve
resin.
ε
tan
δ
composites
at
1
MHz
only
respectively.
Interdisciplinary materials,
Год журнала:
2024,
Номер
3(6), С. 919 - 934
Опубликована: Июль 17, 2024
Abstract
Fluorene‐containing
branched
poly(aryl‐ether‐ketone)
(BFPAEK)
with
terminal
hydroxyl
groups
is
synthesized
by
random
copolycondensation
reaction;
then,
the
CF@BFPAEK/PEEK
laminated
composite
prepared
“powder
impregnation‐high
temperature
compression
molding”
method
poly(ether‐ether‐ketone)
(PEEK)
as
matrix
and
BFPAEK‐modified
carbon
fiber
(CF@BFPAEK)
reinforcement.
When
content
of
units
in
BFPAEK
10%
coating
amount
on
(CF)
surface
3
wt%,
has
outstanding
mechanical
properties,
an
interlaminar
shear
strength
(ILSS)
57.3
MPa
flexural
589.4
MPa,
which
are
80.2%
44.3%
higher
than
those
pure
CF/PEEK
(31.8
408.4
MPa),
respectively.
After
288
h
hydrothermal
aging
high/low‐temperature
alternating
aging,
corresponding
retention
rate
ILSS
respectively
87.9%
84.7%,
composites
(74.5%
70.4%).
The
thermal
conductivity
coefficient
for
5%
weight
loss
1.85
W
m
−1
K
538.0°C,
Functional
cyclophosphazenes
have
proven
to
be
effective
modifiers
of
polymer
materials,
significantly
improving
their
performance
properties,
such
as
adhesive
characteristics,
mechanical
strength,
thermal
stability,
fire
resistance,
etc.
In
this
study,
4-(β-carboxyethenyl)phenoxy-phenoxycyclotriphosphazenes
(CPPP)
were
obtained
by
the
condensation
4-formylphenoxy-phenoxycyclotriphosphazene
with
malonic
acid.
Its
structure
was
studied
using
31P,
1H,
and
13C
NMR
spectroscopy
MALDI-TOF
mass
spectrometry,
properties
determined
DSC
TGA
methods.
Molecular
modeling
MM2
method
showed
that
CPPPs
are
nanosized
diameters
spheres
described
around
molecules
in
range
1.34–1.93
nm,
which
allows
them
classified
structures.
The
epoxy
resin
DER-331
cured
CPPP,
conversion
groups
assessed
IR
spectroscopy.
Using
optical
interferometry,
it
shown
well
compatible
temperature
from
80
130
°C.
It
established
composition
resistant,
successfully
passed
UL-94
vertical
combustion
test
due
formation
porous
coke
during
process
also
had
high
heat
resistance
stability
(decomposition
onset
about
300
°C,
glass
transition
230
°C).
has
low
water
absorption,
fresh
salt
water,
strength
steel
aluminum
(11
±
0.2
MPa),
makes
promising
for
use
an
gluing
parts
shipbuilding
automotive
industries,
aviation
industry,
radio
electronics.
Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
45(5)
Опубликована: Янв. 17, 2024
Abstract
This
study
provides
a
comprehensive
overview
of
the
preparation
methods
for
polyhedral
oligomeric
silsesquioxane
(POSS)
monomers
and
polymer/POSS
nanocomposites.
It
focuses
on
latest
advancements
in
using
POSS
to
design
polymer
nanocomposites
with
reduced
dielectric
constants.
The
emphasizes
exploring
potential
POSS,
either
alone
or
combination
other
materials,
decrease
constant
loss
various
polymers,
including
polyimides,
bismaleimide
resins,
poly(aryl
ether)s,
polybenzoxazines,
benzocyclobutene
polyolefins,
cyanate
ester
epoxy
resins.
In
addition,
research
investigates
impact
incorporating
improving
thermal
properties,
mechanical
surface
aspects
these
polymers.
entire
is
divided
into
two
parts,
discussing
systematically
role
reducing
constants
during
composites
both
physical
blending
chemical
synthesis
methods.
goal
this
provide
valuable
strategies
designing
new
generation
low
materials
suitable
large‐scale
integrated
circuits
semiconductor
domain.
Polymer Composites,
Год журнала:
2024,
Номер
45(8), С. 6788 - 6803
Опубликована: Март 11, 2024
Abstract
Carbon
fibers/poly(ether‐ether‐ketone)
(CF/PEEK)
composites
have
the
advantages
of
excellent
impact
resistance,
good
moisture
and
heat
ultra‐short
molding
cycle
recyclable
secondary
processing.
Therefore,
investigation
on
CF/PEEK
is
an
important
development
direction
low‐cost
high‐performance
polymer‐based
composites.
However,
due
to
strong
surface
inertness
CF
poor
interface
compatibility
between
PEEK
matrix,
mechanical
properties
are
low.
Moreover,
matrix
has
high
melting
point
large
viscosity,
making
processing
very
difficult.
In
this
paper,
factors
affecting
interfacial
composites,
functionalization
modification
methods
CF,
design
&
synthesis
compatibilizer
reviewed.
The
research
progress
related
academic
achievements
in
strengthening
additive
manufacturing
technology
emphatically
discussed.
Finally,
trends
application
prospects
summarized.
Highlights
composite
key
material
for
industry
infrastructure.
interaction
CF.
Journal of Macromolecular Science Part B,
Год журнала:
2024,
Номер
unknown, С. 1 - 15
Опубликована: Июнь 28, 2024
Our
research
described
in
this
manuscript
investigated
the
dielectric
properties
and
structural
characteristics
of
Bisphenol-A
epoxy
resin
composites
infused
with
various
concentrations
(5
wt.%,
10
15
wt.%)
hybrid
nanofillers,
namely
alumina
(Al2O3)
zinc
oxide
(ZnO).
Ultrasonic
dispersion
was
utilized
to
integrate
nanofillers
into
matrix.
Structural
were
assessed
using
X-ray
diffraction
(XRD),
which
confirmed
presence
Al2O3
ZnO
nanoparticles
within
Dielectric
measured
over
a
frequency
range
104
Hz
2
MHz.
The
results
provide
new
insights
polarization
mechanisms
these
composites,
highlighting
their
potential
for
enhanced
performance
high-frequency
applications.
To
further
understand
predict
properties,
CatBoost
LightGBM
regression
models
employed
constant
(ε'),
loss
tangent
(tan
δ),
AC
conductivity
(σac)
composites.
demonstrated
strong
predictive
accuracy,
metrics,
including
Mean
Absolute
Error
(MAE),
Root
Square
(RMSE),
R-squared
(R2),
indicating
robustness
accuracy
predicting
study's
findings
underscore
significant
