Polymer Testing,
Journal Year:
2024,
Volume and Issue:
134, P. 108437 - 108437
Published: April 26, 2024
To
solve
the
non-renewable
and
flammability
of
traditional
epoxy
composites,
a
new
type
intrinsic
flame-retardant
(VH/GF)
composite
was
fabricated
from
vanillin-based
resin
(VH)
glass
fibre
(GF).
The
T5%
VH/GF
higher
than
that
DGEBA/GF,
CY800
reached
above
84
wt.%.
obtained
limiting
oxygen
index
as
high
90%
passed
UL-94
V-0
rating.
Compared
with
total
heat
release,
smoke
production,
maximal
density
reduced
by
more
72%,
91%
81%,
respectively.
physical
barrier
excellent
char
formation
ability
VH
endowed
good
condensed
phase
effect.
When
mass
ratio
matrix
5:5,
storage
modulus
transition
temperature
were
6.34
GPa
205
°C,
its
tensile
strength
elongation
at
break
348.36
MPa
4.01%.
This
work
provides
research
insights
for
bio-based
in
high-performance
fire
safety
composites.
Polymers,
Journal Year:
2023,
Volume and Issue:
15(15), P. 3177 - 3177
Published: July 26, 2023
The
recycling
of
biomass
into
high-value-added
materials
requires
important
developments
in
research
and
technology
to
create
a
sustainable
circular
economy.
Lignin,
as
component
biomass,
is
multipurpose
aromatic
polymer
with
significant
potential
be
used
renewable
bioresource
many
fields
which
it
acts
both
promising
biopolymer
bioactive
compound.
This
comprehensive
review
gives
brief
insights
the
recent
technological
trends
on
lignin
development
utilization.
It
divided
ten
main
sections,
starting
an
outlook
its
diversity;
properties
possibilities
raw
material
for
fuels,
chemicals,
plastics,
or
thermoset
substitutes;
new
use
compound
nanoparticles,
hydrogels,
3D-printing-based
biomaterials,
energy
production
storage.
In
each
section
are
presented
preparation
lignin-based
especially
green
approaches
obtaining
multifunctional
blends
bio(nano)composites;
most
suitable
type
category
envisaged
products;
obtained
materials,
etc.
Different
application
categories
within
various
sectors,
could
provide
completely
conversion,
such
agriculture
environment
protection,
food
packaging,
biomedicine,
cosmetics,
also
described.
medical
therapeutic
lignin-derived
evidenced
applications
antimicrobial,
antiviral,
antitumor
agents;
carriers
drug
delivery
systems
controlled/targeting
release;
tissue
engineering
wound
healing;
coatings,
natural
sunscreen,
surfactants.
Lignin
mainly
fuel,
and,
recently,
studies
highlighted
more
bioenergy
technologies,
supercapacitor
electrode,
photocatalysts,
photovoltaics.
ACS Applied Polymer Materials,
Journal Year:
2023,
Volume and Issue:
5(2), P. 1312 - 1324
Published: Jan. 13, 2023
Nowadays,
traditional
petroleum-based
diglyceryl
ether
of
bisphenol
A
epoxy
resins
(DGEBA)
have
prominent
problems
such
as
nonrenewable
raw
materials,
flammability,
and
poor
toughness.
Herein,
a
vanillin-based
resin
(VH-HDA-EP)
containing
rigid
Schiff
base
structure
flexible
alkane
segment
was
synthesized
from
vanillin,
1,6-hexanediamine,
epichlorohydrin
through
facile
highly
efficient
method,
it
cured
with
4,4′-diaminodiphenylmethane
(DDM)
to
prepare
VH-HDA-EP/DDM
thermosets.
Curing
kinetics
analysis
demonstrated
that
the
activation
energy
VH-HDA-EP
much
higher
than
DGEBA.
Thermogravimetric
analyses
illustrated
char
yield
30.8
wt
%
at
nitrogen
atmosphere,
which
nearly
two
times
DGEBA/DDM
(17.9
%).
Moreover,
obtained
limiting
oxygen
index
high
38.5%
passed
UL-94
V-0
rating
test.
Compared
DGEBA/DDM,
total
heat
release,
smoke
production,
maximal
density
were
significantly
reduced
by
45.1,
73.4,
36.2%,
respectively.
The
residue
results
revealed
could
contribute
formation
continuous
dense
residues
in
condensed
phase.
storage
modulus
glass
transition
temperature
2821
MPa
186
°C,
those
(1990
168
°C).
tensile
strength
elongation
break
55.6
8.3%,
respectively,
showed
obvious
strain
strengthening
characteristic.
Furthermore,
enhancement
mechanism
flame
retardancy
mechanical
properties
proposed,
is
mainly
due
complementary
effect
segment.
This
work
provides
insights
for
preparing
high-performance
bio-based
excellent
properties.
