Polymers,
Journal Year:
2024,
Volume and Issue:
16(24), P. 3549 - 3549
Published: Dec. 19, 2024
In
this
study,
CO2
reacted
with
a
curing
agent
through
nucleophilic
addition
to
form
ammonium
salts,
enabling
the
stable
capture
and
internal
release
of
CO2,
which
achieved
gas-phase
nucleation
foaming.
Additionally,
introduction
wave-absorbing
agents
improved
absorption
mechanism
promoted
uniform
This
nucleation-free
foaming
process
relies
on
induced
growth
gas
nuclei
synergistic
effect
agents,
effectively
preventing
uneven
issues
caused
by
traditional
nucleating
agents.
Ultimately,
lightweight
epoxy
foam
absorbing
material
(LFAM)
was
developed.
BET
tests
showed
that
2.0
wt%
carbon-based
(LFAMs–A2)
expanded
material’s
volume
4.6
times
its
original
size,
forming
porous
structure.
VNA
revealed
LFAMs–A2
minimum
reflection
loss
−13.25
dB
an
bandwidth
3.7
GHz
in
12–18
range.
The
ferrite-based
(LFAMs–C2)
−26.83
at
16.6
5.3
GHz,
nearly
covering
Ku
band.
DSC
indicated
maintained
good
thermal
stability
150
°C.
study
provides
new
approach
for
coatings
structural
optimization,
broad
application
potential
5G
communications,
microwave
anechoic
chambers,
aerospace
fields.
