ACS Applied Polymer Materials,
Journal Year:
2024,
Volume and Issue:
6(4), P. 2107 - 2117
Published: Feb. 1, 2024
In
this
work,
diglycidyl
ether
of
bisphenol
A
(DGEBA)
is
cured
with
the
bioderived
branched
polyphenol
tannic
acid
(TA)
to
establish
optimum
composition
for
enhanced
mechanical
and
thermal
properties
processability.
To
do
this,
DGEBA
TA
systematically
varied
impact
upon
cure
kinetics,
network
structure,
determined.
As
concentration
increases,
exhibit
a
peak
in
performance
corresponding
formation
homogeneous
microstructure
where
reaction
occurs
initially
via
faster
epoxide
addition
then
by
slower
homopolymerization
epoxy
resin.
Although
precise
stoichiometry
formulation
unknown,
given
uncertainty
surrounding
reactivity
each
phenolic
group,
partially
resin
system
displays
processability
consistent
other
highly
aromatic
cross-linked
fossil
fuel-derived
systems.
For
example,
maximum
Tg,
determined
DMTA,
190
°C
(tan
δ
max),
flexural
modulus
over
3
GPa,
strength
approaches
50
MPa,
fracture
toughness
KIC
0.6
MPa
m1/2.
Furthermore,
T5%
decomposition
temperature
fully
361
°C,
while
char
yield
23.9%,
which
entirely
degradation
high-performance
networks.
The
detailed
structure–property
relationships
presented
here
are
an
important
step
commercial
exploitation
Journal of Vinyl and Additive Technology,
Journal Year:
2022,
Volume and Issue:
29(1), P. 130 - 143
Published: Oct. 14, 2022
Abstract
In
this
paper,
we
report
a
method
of
preparation
ambient
temperature
curable
phosphorous
containing
epoxy
resin‐based
composites
and
their
flame
retardant
behavior.
The
resin,
prepared
by
reacting
the
resin
with
9,10‐Dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide
(DOPO),
shows
higher
limiting
oxygen
index
(LOI)
in
cured
state
compared
to
pure
network.
LOI
value
is
further
enhanced
due
incorporation
phosphorous‐containing
silica,
although
same
remains
unchanged
when
silica
added.
made
exhibits
UL‐94
V‐1
class
rating
whereas
offers
V‐0
under
classification.
This
observation
clearly
indicates
that
performance
incorporated
as
well
inorganic
reinforcing
filler.
Polymers,
Journal Year:
2023,
Volume and Issue:
15(5), P. 1304 - 1304
Published: March 5, 2023
A
unique
hybridized
intumescent
flame
retardant
named
reduced-graphene-oxide-modified
ammonium
polyphosphate
(RGO-APP)
was
successfully
synthesized
via
the
simple
hydrothermal
method
and
reduced
process.
Then,
obtained
RGO-APP
applied
in
epoxy
resin
(EP)
for
retardancy
reinforcement.
The
addition
of
results
a
significant
reduction
heat
release
smoke
production
from
EP,
which
is
attributed
to
EP/RGO-APP
producing
more
compact
char
against
transfer
combustible
decomposition,
thus
enhancing
fire
safety
as
confirmed
by
residue
analysis.
Especially,
EP
containing
15
wt%
acquires
limiting
oxygen
index
(LOI)
value
35.8%
shows
83.6%
peak
rate
74.3%
compared
with
those
pure
EP.
tensile
test
exhibits
that
presence
favors
enhancement
strength
elastic
modulus
due
good
compatibility
between
matrix,
supported
differential
scanning
calorimetry
(DSC)
electron
microscope
(SEM)
analyses.
This
work
provides
new
strategy
modification
APP,
facilitating
promising
application
polymeric
materials.
Industrial & Engineering Chemistry Research,
Journal Year:
2023,
Volume and Issue:
62(18), P. 7262 - 7274
Published: April 25, 2023
To
overcome
the
high
flammability
and
brittleness
of
epoxy
resin
(EP)
without
sacrificing
its
glass
transition
temperature
(Tg)
mechanical
properties,
a
series
hyperbranched
benzoxazines
(HB1.0–HB2.5)
were
synthesized
using
6-(bis(4-hydroxyphenyl)methyl)dibenzo[1,2]oxaphosphinine
6-oxide
(DOPO-2OH)
as
"hard"
segment
Jeffamine
T403
"soft"
segment.
The
property
investigation
revealed
that
HB2.0
with
optimized
ratio
"hard/soft"
segments
was
appropriate
additive
for
commercial
EP.
Furthermore,
comprehensive
performance
EP/HB2.0
system
significantly
enhanced
compared
to
pristine
EP,
demonstrating
115%
increase
in
impact
strength
5.7
°C
Tg.
Impressively,
when
loading
only
10
phr
(phosphorus
content
is
0.34
wt
%),
modified
EP
passed
UL-94
V-0
rating
achieved
limited
oxygen
index
(LOI)
value
30.8%,
mainly
resulting
from
flame
inhibition
effect
gaseous
phase.
This
research
provided
an
appealing
technique
simultaneously
improving
toughness
retardancy
ACS Applied Polymer Materials,
Journal Year:
2024,
Volume and Issue:
6(4), P. 2107 - 2117
Published: Feb. 1, 2024
In
this
work,
diglycidyl
ether
of
bisphenol
A
(DGEBA)
is
cured
with
the
bioderived
branched
polyphenol
tannic
acid
(TA)
to
establish
optimum
composition
for
enhanced
mechanical
and
thermal
properties
processability.
To
do
this,
DGEBA
TA
systematically
varied
impact
upon
cure
kinetics,
network
structure,
determined.
As
concentration
increases,
exhibit
a
peak
in
performance
corresponding
formation
homogeneous
microstructure
where
reaction
occurs
initially
via
faster
epoxide
addition
then
by
slower
homopolymerization
epoxy
resin.
Although
precise
stoichiometry
formulation
unknown,
given
uncertainty
surrounding
reactivity
each
phenolic
group,
partially
resin
system
displays
processability
consistent
other
highly
aromatic
cross-linked
fossil
fuel-derived
systems.
For
example,
maximum
Tg,
determined
DMTA,
190
°C
(tan
δ
max),
flexural
modulus
over
3
GPa,
strength
approaches
50
MPa,
fracture
toughness
KIC
0.6
MPa
m1/2.
Furthermore,
T5%
decomposition
temperature
fully
361
°C,
while
char
yield
23.9%,
which
entirely
degradation
high-performance
networks.
The
detailed
structure–property
relationships
presented
here
are
an
important
step
commercial
exploitation
