Journal of Polymer Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
ABSTRACT
Simultaneously
increasing
mechanical
strength,
toughness,
thermal
stability,
and
flame
retardancy
of
epoxy
thermoset
without
compromising
transparency
is
appealing
but
challenging.
To
address
that
goal,
a
Schiff
base
VDEP
developed.
The
neat
VDEP‐cured
product,
100wt%
,
not
only
shows
comparable
strength
to
conventional
also
can
be
degraded
in
10%
H
2
SO
4
/THF/H
O
solution
24
h,
showing
great
degradability
under
mild
conditions.
More
importantly,
proper
addition
simultaneously
increases
the
tensile
impact
T
g
d5%
char
residue,
UV
shielding
cured
epoxies
while
providing
self‐extinguishing
ability.
All
those
enhancements
are
achieved
deteriorating
transparency.
When
15
wt%
added,
reaches
91.07
MPa,
with
36.7%
increase;
40.73
kJ
m
−2
33.8%
increase.
enhancement
due
reinforcing
effect
intermolecular
interaction
compacted
network
caused
by
free
volume
reduction.
higher
toughness
results
from
greater
mobility
chain
segments,
reduced
crosslinking
density
energy
dissipative
interaction.
rigid
two
benzene‐conjugated
structure
abundant
hydrogen
bonding
contribute
.
Therefore,
this
work
provides
degradable
high‐performance
based
on
it.
ECS Journal of Solid State Science and Technology,
Journal Year:
2023,
Volume and Issue:
12(10), P. 103017 - 103017
Published: Oct. 1, 2023
Surface
charge
accumulation
of
epoxy
resin
is
easy
to
cause
surface
flashover
under
DC
voltage,
and
thermal
aging
an
important
factor
affecting
trapping
characteristics.
In
this
paper,
the
electron
hole
trap
characteristics
were
studied
by
changing
polarity
amplitude
charging
voltage.
Then,
influence
on
energy
level
distribution
researched
conducting
experiment,
based
which
negative
furtherly
studied.
Experimental
results
show
that
ranges
from
0.70
eV
0.96
eV,
peak
slightly
higher
than
trap.
The
maximum
density
trapped
in
1.98
×
10
20
−1
·m
−3
1.82
respectively.
traps
generally
shows
a
deepening
trend
after
aging.
increases
0.84
0.98
29
d
aging,
due
product
containing
strongly
polar
group
produced
testing
voltage
first
then
decreases
with
extension
time.
With
time
7
d,
about
11.2%,
change
related
dielectric.
This
paper
can
provide
theoretical
experimental
basis
for
insulation
design
applied
electric
equipment.
Journal of Polymer Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
ABSTRACT
Simultaneously
increasing
mechanical
strength,
toughness,
thermal
stability,
and
flame
retardancy
of
epoxy
thermoset
without
compromising
transparency
is
appealing
but
challenging.
To
address
that
goal,
a
Schiff
base
VDEP
developed.
The
neat
VDEP‐cured
product,
100wt%
,
not
only
shows
comparable
strength
to
conventional
also
can
be
degraded
in
10%
H
2
SO
4
/THF/H
O
solution
24
h,
showing
great
degradability
under
mild
conditions.
More
importantly,
proper
addition
simultaneously
increases
the
tensile
impact
T
g
d5%
char
residue,
UV
shielding
cured
epoxies
while
providing
self‐extinguishing
ability.
All
those
enhancements
are
achieved
deteriorating
transparency.
When
15
wt%
added,
reaches
91.07
MPa,
with
36.7%
increase;
40.73
kJ
m
−2
33.8%
increase.
enhancement
due
reinforcing
effect
intermolecular
interaction
compacted
network
caused
by
free
volume
reduction.
higher
toughness
results
from
greater
mobility
chain
segments,
reduced
crosslinking
density
energy
dissipative
interaction.
rigid
two
benzene‐conjugated
structure
abundant
hydrogen
bonding
contribute
.
Therefore,
this
work
provides
degradable
high‐performance
based
on
it.
