Coatings,
Journal Year:
2025,
Volume and Issue:
15(4), P. 376 - 376
Published: March 23, 2025
Unsaturated
polyester
(UP)
resin
is
widely
utilized
in
the
construction
and
automotive
industries.
The
flammable
nature
of
UP
must
be
constrained
when
its
products
are
manufactured.
A
novel
organic
flame
retardant
has
been
synthesized
from
9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide
(DOPO)
triallyl
isocyanate
(TAIC).
This
DOPO-TAIC
additive
used
to
reduce
flammability
a
matrix.
Additionally,
this
was
then
combined
with
dopamine-modified
silicon
carbide
(M-SiC)
further
diminish
UP.
limiting
oxygen
index
(LOI)
value
combustion
UP/DOPO-TAIC/M-SiC
blend
30.8%
filler
contents
M-SiC
15
wt.%
30
wt.%,
respectively.
These
materials
exhibited
UL
94
V-0
rating
for
combustion.
Compared
values
neat
UP,
peak
heat
release
rate
(Pk-HRR)
total
(THR)
were
reduced
by
51%
35%,
mode
action
blends
containing
composed.
presence
P-Si
elements
can
significantly
compared
that
unmodified
resin.
In
order
to
reduce
dependence
on
petroleum
resources,
three
different
biobased
epoxy
monomers
(Eu-EP-1,
Eu-EP-2,
and
Eu-EP-3)
with
a
carbon
content
of
76.9%–83.3%
were
prepared
from
eugenol,
which
can
be
derived
lignin.
Three
eugenol-based
thermosets
(Eu-EP-1/IPDA,
Eu-EP-2/IPDA,
Eu-EP-3/IPDA)
then
obtained
by
curing
Eu-EP
monomer
commercial
IPDA
(isophorone
diamine)
hardener;
the
activation
energy
was
in
range
37.4–48.2
kJ/mol,
gel
ranged
95.4%–96.5%,
cross-linking
degree
reached
1185–2119
mol/m3,
confirming
that
cured
form
network
structures.
Therefore,
Eu-EP/IPDA
had
excellent
in-service
performance
Tg
63.9–76.3
°C
tensile
strength
34.7–43.1
MPa.
However,
permanent
chemical
bonds
difficult
recycle.
Since
Eu-EP-2/IPDA
balanced
performance,
Eu-EP-2
selected
develop
recyclable
Eu-EP/AFD
vitrimers
AFD
(4,4′-dithiodiphenylamine).
The
resulting
Eu-EP-2/AFD1.00
vitrimer
79.4
39.2
MPa,
remodeling
could
achieved
hot
pressing
at
200
for
6
h;
self-healing
scratched
material
heating
180
2
h,
dissolved
mercaptoethanol.
is
potential
sustainable
development
materials
recyclability.
This
study
offers
facile
solution
materials.
Journal of Vinyl and Additive Technology,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 19, 2025
Abstract
When
flame
retardants
are
added
to
epoxy
resins
(EP)
enhance
their
retardancy,
it
often
results
in
a
negative
impact
on
the
mechanical
properties
of
itself.
In
order
solve
this
problem,
new
reactive
retardant
multi‐element
hydrazides
(BSD)
is
synthesized
by
using
benzenesulfonohydrazide
and
diphenylphosphinic
chloride
as
raw
materials,
can
play
effect
through
synergistic
P\N\S
multi‐elements,
at
same
time,
large
number
secondary
amine
groups
structure
BSD
produce
strong
hydrogen
bonding
interactions
with
hydroxyl
molecular
chain
EP.
The
experimental
proved
that
incorporation
only
3
wt%
enabled
EP
achieve
UL‐94
V‐0
rating.
Furthermore,
when
amount
increased
5
wt%,
values
for
peak
heat
release
rate
(PHRR)
total
showed
reduction
26%
20.8%,
ultimately
maximizing
limiting
oxygen
index
34.9%,
showing
exceptional
efficiency.
meantime,
37.3%
increase
flexural
strength
21.4%
tensile
strength,
transparency
modified
resin
was
still
maintained
time.
summary,
introducing
into
obtains
highly
efficient
reinforced
(FREP).
Highlights
A
P/N/S‐containing
hydrazide
improve
P
content
0.25
FREP
reaches
grade.
Tensile
up
37.3%.
With
addition
BSD,
show
high
transparency.
