ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 30, 2024
Biovitrimer
pads
with
high
flame
retardancy
and
thermal
conductivity
were
developed
using
tannic
acid
(TA),
phosphoric
(PA),
poly(vinyl
alcohol)
(PVA).
For
the
first
time,
it
was
discovered
that
this
type
of
pad
is
formed
through
dynamic
bonding
P–O–C
covalent
bonds.
The
vitrimer
transition
temperature
(Tv),
which
indicates
bonding,
controlled
within
74–91
°C
range
by
adjusting
TA,
PA,
PVA
composition
ratio.
Below
Tv,
exhibited
excellent
elastic
recovery
properties,
a
rate
over
90%
when
subjected
to
100%
strain.
material
demonstrated
tensile
strength
8
MPa
430%
elongation
at
break.
Interestingly,
samples
deformed
100
(above
Tv)
then
rapidly
cooled
showed
shape
memory
effect,
returning
their
original
form
reheated
above
Tv.
Thanks
in
vitrimer,
these
materials
achieved
limiting
oxygen
index
values
exceeding
55%
highest
V-0
rating
UL-94
test,
demonstrating
not
seen
existing
vitrimers.
Combining
biovitrimer
hexagonal
boron
nitride
(h-BN)
produced
composite
film
up
3.8
W/m·K,
proving
its
effectiveness
as
heat
dissipation
pad.
Additionally,
vitrimer's
properties
allowed
for
complete
both
h-BN
recycling.
A
closed-loop
recycling
process
same
performance
could
be
remanufactured
reclaimed
h-BN.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 10, 2025
Polyurethane
thermosets
are
a
key
component
of
high-performance
plastics,
renowned
for
their
outstanding
and
customizable
thermal
mechanical
properties,
making
them
ideal
wide
array
applications.
Yet,
existing
recycling
methods
conventional
polyurethanes
based
on
harsh
conditions
that
yield
complex
mixture
molecules
oligomers,
which
difficult
to
isolate,
rendering
chemical
unfeasible.
This
underscores
the
urgent
need
innovative
solutions
enhance
recyclability
polyurethane
materials,
supporting
transition
circular
economy.
To
address
these
challenges,
we
have
developed
several
polyfunctional
acetal
polyols,
were
synthesized
under
solvent-free
using
heterogeneous
catalysts
incorporated
into
thermosets.
integration
yielded
an
recyclable
thermosetting
exhibited
broad
range
matching
performance
traditional
polyurethanes,
including
high
stability
excellent
strength.
Notably,
materials
also
displayed
remarkable
in
water
various
organic
solvents.
The
depolymerization
achieved
through
hydrolysis
without
utilization
solvents,
allowing
recovery
original
monomers
primary
building
blocks
purity.
Our
work
presents
promising
pathway
toward
more
sustainable
achieving
compromising
performance.
Nanocomposites
of
epoxy
with
Fe3O4
featuring
dynamic
disulfide
bonds
were
fabricated.
To
facilitate
the
dispersion
nanoparticles,
we
synthesized
poly(ε-caprolactone)-grafted
which
then
incorporated
into
to
generate
robust
interfacial
interactions
between
and
inorganic
nanoparticles.
Through
this
approach,
a
fine
nanoparticles
in
matrix
was
successfully
obtained.
The
incorporation
resulted
being
effectively
toughened;
critical
stress
field
intensity
factor
(KIC)
enhanced
twice
as
control
epoxy.
Thanks
integration
covalent
(i.e.,
bonds),
nanocomposites
displayed
excellent
reprocessable
or
recyclable
properties.
Depending
on
contents
can
be
modulated
have
shape
recovery
desired
transition
temperatures.
Benefiting
from
dynamicity
bonds,
memory
behavior
featured
reconfigurability.
Inheriting
nature
likewise
superparamagnetic
photothermal
By
taking
advantage
behavior,
triggered
through
infrared
laser
irradiation
noncontact
manner.
Journal of Applied Polymer Science,
Год журнала:
2025,
Номер
142(13)
Опубликована: Янв. 6, 2025
ABSTRACT
Designing
and
preparing
bio‐based
epoxy
monomers
to
substitute
hazardous
nonrenewable
bisphenol
A
(BPA)‐type
epoxide
are
important
for
the
development
of
new
resins
under
concept
healthy
sustainable
concept.
In
this
work,
a
“green”
bifunctionality
monomer
derived
from
eugenol
(EGE‐EP)
was
fabricated
by
epoxidation
functionalization
unsaturated
double
bond
as
well
using
epichlorohydrin
epoxidize
phenolic
hydroxyl
group.
The
effects
different
hardeners
on
properties
EGE‐EP
were
analyzed,
E51
cured
with
same
employed
reference.
results
indicate
that
EGE‐EP/hardeners
present
desired
curing
behavior,
mechanical
performances,
thermal
stability
which
comparable
commercial
E51/hardeners
resin.
Most
importantly,
all
EP/hardeners
samples
exhibit
lower
onset
temperature
compared
systems
reflecting
faster
mixtures.
Meanwhile,
an
obvious
improvement
char
yield
is
found
in
contrast
thus
possessing
potential
flame
retardancy
applications.
This
study
proposes
innovative
path
prepare
alternative
BPA‐type
epoxide,
significance
eco‐friendly
high‐value
utilization
biomass.
Materials,
Год журнала:
2025,
Номер
18(2), С. 351 - 351
Опубликована: Янв. 14, 2025
Carbon-fiber-reinforced
polymers
(CFRPs)
with
epoxy
matrices
are
widely
applied
in
high-performance
structural
applications
and
represent
one
of
the
biggest
classes
materials
urgent
need
for
end-of-life
management.
Available
waste
management
methodologies
conventional
thermoset
composites
a
focus
on
CFRPs
briefly
reviewed
their
limitations
highlighted.
In
quest
to
obtain
mechanical
performance,
thermal
stability,
sustainability,
research
community
has
turned
its
interest
develop
polymer
adaptable
dynamic
networks
matrix,
lately
also
at
an
interface/interphase
level.
The
current
review
focuses
life
extension/waste
options
that
opened
through
introduction
covalent
matrix
CFRPs.
processing
conditions
healing/repairing,
welding/reshaping,
and/or
recycling
presented
detail,
compared
based
most
common
exchange
reactions.
