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.
Polymer Degradation and Stability,
Journal Year:
2024,
Volume and Issue:
223, P. 110743 - 110743
Published: March 12, 2024
This
work
provides
a
comprehensive
thermomechanical
and
rheological
characterization
of
high-performance
epoxy
resin
synthesized
from
vanillin
derivative,
vanillyl
alcohol.
The
study
includes
complete
analysis
the
curing
decomposition
kinetics
that
enabled
Time-Temperature-Transformation
plot
accounting
for
gelation,
vitrification,
degradation
to
be
developed.
These
plots
allow
one
determine
optimal
time
temperature
processing
conditions
will
yield
best
mechanical
properties.
Kinetic
predictions
experimental
results
showed
this
can
cured
at
room
in
just
few
hours,
forming
solid
gelled
glass.
Enhanced
properties
are
achieved
by
post-curing
temperatures
above
Tg∞
=
85.4°C.
With
dynamic
storage
modulus
2.7
GPa,
bio-based
proves
sustainable
alternative
fossil-based
resins
whose
primary
source
is
ever-prevalent
bisphenol
A
diglycidyl
ether.
Thermal
oxidation
main
cause
deterioration
high
temperatures,
as
revealed
FTIR
spectroscopy.
Macromolecular Rapid Communications,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 20, 2025
Abstract
Epoxy
resin
is
indispensable
in
various
applications
due
to
its
outstanding
properties.
However,
limited
recyclability
and
associated
environmental
issues
pose
significant
challenges
for
sustainable
development.
To
address
this
issue,
integrating
recyclable
Schiff
base
groups
into
epoxy
systems
construct
vitrimer
with
dynamic
properties
has
become
a
promising
strategy.
Herein,
rapid
degradation,
enhanced
mechanical
properties,
low
dielectric
constant
(EP‐BOB)
proposed
through
unique
rigid‐flexible
structure
bio‐based
curing
agent
(BOB).
BOB
synthesized
using
siloxane
as
flexible
chain
bridge
vanillin
one‐pot
process.
The
incorporation
of
the
imparted
exceptional
degradability
EP‐BOB,
allowing
it
fully
degrade
within
45
min.
In
addition,
structure,
EP‐BOB
exhibited
lower
(1.2–2.6)
(60.5
MPa
tensile
strength).
Furthermore,
Raman
spectroscopy
scanning
electron
microscopy
shows
that
can
be
completely
degraded
amine
solution
recycle
carbon
fibers
(CFs)
without
damage.
Especially,
endow
UV‐shielding
antibacterial
This
work
opens
up
new
strategy
designing
silicone
achieve
multifunctional
high‐performance
EP.
Polymers for Advanced Technologies,
Journal Year:
2024,
Volume and Issue:
35(4)
Published: April 1, 2024
Abstract
To
meet
the
demands
of
high‐density
and
miniaturized
integrated
circuits,
electronic
packaging
materials
need
to
have
excellent
properties.
One
approach
enhance
performance
is
design
novel
structures.
In
this
study,
two
novolac
oligomers
containing
naphthalene
Naphthalene
oligomer
(NPF)
biphenyl
Biphenyl
(LPF)
were
synthesized
then
reacted
with
epichlorohydrin
synthesize
epoxy
resins
polycyclic
aromatic
hydrocarbons
(NPF‐EP
LPF‐EP).
Their
chemical
structures
characterized
by
Fourier
transform
infrared
1
H
nuclear
magnetic
resonance
spectra.
Tetrahydromethyl‐1,3‐isobenzofurandione
(MeTHPA)
was
used
as
curing
agent
prepare
cured
NPF‐EP/MeTHPA
LPF‐EP/MeTHPA
thermosets.
Both
exhibited
better
thermal
mechanical
properties
compared
resin
(PF‐EP/MeTHPA).
particular,
presented
highest
glass
transition
temperature
193°C
had
properties,
tensile
flexural
strengths
94
151
MPa,
respectively.
Additionally,
also
exhibit
a
lower
dielectric
constant
loss,
low
coefficient
expansion
PF‐EP/MeTHPA.
This
investigation
provides
valuable
insights
for
manufacturing
high‐performance
application
in
materials.
REVIEWS ON ADVANCED MATERIALS SCIENCE,
Journal Year:
2023,
Volume and Issue:
62(1)
Published: Jan. 1, 2023
Abstract
Hybrid
composite
materials
are
becoming
more
desirable
for
various
industrial
applications
to
enhance
sustainability
and
develop
better
environmentally
friendly
green
products.
This
work
aims
the
synergy
of
both
bio-ceramic
eggshell
date
palm
leaflet
(DPL)
fillers
integrate
their
advantages
in
an
optimized
hybridization
manner
significance
producing
novel
biomaterials
with
improved
desired
mechanical,
thermal,
morphological
characteristics.
Different
weight
percentages
hybrid
reinforcement
(poultry
eggshells
DPLs)
were
utilized
ratios
(3:7,
5:5,
7:3),
(15:5,
10:10,
5:15),
(20:10,
15:15,
10:20)
fabricate
10,
20,
30
wt%
biomaterials.
The
regularly
chopped
DPLs
immersed
concentrations
sodium
hydroxide
at
different
soaking
times
optimize
improve
bonding
polypropylene
(PP)
matrix.
properties
fabricated
composites
investigated.
results
have
revealed
that
certain
could
tensile
flexural
modulus
by
up
26
11%,
respectively.
According
thermogravimetric
analysis
its
derivatives,
was
also
found
excellent
influence
on
thermal
stability
PP
Regarding
micrographs
utilizing
scanning
electron
microscopy,
exhibited
good
bonding,
whereas
depicted
behaviors
depending
surface
topologies.
It
higher
had
effects
strength
than
palms,
regardless
percentages.
case
be
capable
improving
elasticity
838
MPa
735
MPa,
which
suitable
structural
Polymer Composites,
Journal Year:
2023,
Volume and Issue:
45(3), P. 2114 - 2126
Published: Nov. 7, 2023
Abstract
Gallic
acid
is
a
renewable
plant
phenolic
resource,
and
the
polyphenolic
bio‐based
epoxy
resin
prepared
from
it
can
be
used
as
substitute
for
bisphenol
A
in
certain
fields.
However,
resins
field
of
high‐performance
composite
material
matrices
often
require
modification.
In
this
paper,
firstly,
γ‐(2,3‐epoxypropoxy)propyl
trimethoxysilane
(KH560)
was
raw
to
prepare
epoxy‐based
cage
silsesquioxanes
(E‐POSS).
Then,
E‐POSS
grafted
onto
γ
‐aminopropyltriethoxysilane
(KH550)
modified
halloysite
nanotubes
(m‐HNTs)
novel
hybrid
nanoparticle
HNTs‐e‐POSS.
Experimental
analysis
shows
that
ring
opening
reactions
amino
groups
occur
between
m‐HNTs
E‐POSS,
forming
system
POSS
aggregates
on
surface
HNTs.
Bio‐based
nanocomposites
were
by
adding
different
mass
fractions
nanoparticles
HNTs‐e‐POSS
into
polyphenol
type
gallic
matrix
(GAER)
using
methyltetrahydrophthalic
anhydride
curing
agent.
The
properties
micromorphology
analyzed
characterized.
research
showed
with
addition
nanoparticles,
strength
toughness
show
pattern
first
increasing
then
decreasing,
while
storage
modulus(
E
′),
glass
transition
temperature
(
T
g
),
thermal
stability
increased.
Mechanical
performance
introduction
0.5
wt%
would
increase
tensile
25.46%,
0.75
impact
15%.
′(30°C)
increased
24.2%
7.7°C
when
0.25
wt%.
Highlights
Prepared
grafting
HNTs
surface.
Application
modification
resin.
co‐cured
crosslinking
degree.
strength,
toughness,
modulus
are
improved.
enhanced.
