ACS Applied Polymer Materials,
Journal Year:
2024,
Volume and Issue:
6(20), P. 12598 - 12605
Published: Oct. 8, 2024
Dynamically
cross-linked
polyolefins
represent
a
sustainable
and
high-performance
polyolefin
material
that
attracts
great
attention.
In
this
work,
series
of
cross-linkable
norbornenyl
copolymers
with
tunable
acetoacetate-terminated
comonomer
compositions
are
successfully
synthesized
via
ring-opening
metathesis
polymerization
(ROMP).
Furthermore,
the
resulting
can
be
cured
primary
amine
cross-linker
to
form
vinylogous
urethane
(VU)
containing
cyclic
olefin
vitrimers,
providing
opportunities
for
enhanced
properties.
Our
results
demonstrate
tailoring
constitutional
unit
linear
is
viable
strategy
designing
vitrimers
cross-linking
density,
which
used
regulate
thermomechanical
properties
markedly.
Moreover,
evidence
manifests
density
free
groups
play
vital
roles
in
dynamic
VU-based
vitrimers.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2023,
Volume and Issue:
11(45), P. 16354 - 16364
Published: Nov. 1, 2023
The
insufficient
molecular
weight
of
linear
poly(butylene
adipate-co-terephthalate)
(PBAT)
leads
to
poor
foamability
and
mechanical
performance
foams,
which
seriously
restricts
the
industrial
application
PBAT
as
foam
materials.
Herein,
biobased
itaconic
anhydride
was
grafted
onto
backbone,
then
epoxidized
soybean
oil
added
obtain
a
dynamic
cross-linked
network
based
on
Zn(II)-catalyzed
transesterification.
rheology
results
showed
that
storage
modulus
viscosity
vitrimers
increased
obviously,
exhibiting
viscous
liquid-like
elastic
solid-like
transition
behavior
with
increasing
degrees.
Reversible
cleavage
cross-links
reformation
integrated
through
rebonding
bonds
were
observed
under
shears
alternative
large-
low-amplitude
oscillations,
endowing
fluidity
elasticity
during
processing.
exhibited
strain-hardening
in
an
extensional
flow
could
be
foamed
by
supercritical
carbon
dioxide
foaming.
lightweight
show
expansion
ratio
up
26.7-fold
density
0.045
g/cm3.
On
coupling
cell
structure
properties
contributed
network,
foams
enhanced
elasticity,
specific
compressive
strength,
damping
properties.
strategy
altering
viscoelasticity
simultaneously
cross-linking
provides
new
approach
toward
obtaining
high-performance
foams.
Journal of Material Science and Technology,
Journal Year:
2024,
Volume and Issue:
196, P. 224 - 236
Published: March 14, 2024
The
conception
of
epoxy
thermosets
with
both
reprocessability
and
flame
retardancy
delineates
a
new
horizon
in
polymer
science,
offering
material
solution
that
is
not
only
superior
fire
safety
but
also
environment
friendly.
Herein,
flame-retardant
vitrimer
(EV)
was
prepared
using
partially
bio-based
IADPPO
(diphenylphosphine
oxide
itaconic
anhydride)
citric
acid
as
curing
reagents
via
solvent-free
process.
Their
incorporation
created
covalent
adaptable
networks
(CANs)
the
matrix
which
promote
recyclability.
EV
exhibits
excellent
thermal
stability
high
initial
decomposition
temperature
(T-5wt%
∼308°C)
glass
transition
(Tg
∼107°C),
similar
to
blank
(115°C).
retardancy,
mechanical
properties,
transesterification-based
reprocessability,
mechanism
were
investigated.
containing
3
wt%
phosphorus
(EV
3P)
achieved
UL-94
V0
classification
limiting
oxygen
index
(LOI)
27
%,
while
virgin
sample
Blank
(without
phosphorus)
burned
completely.
Additionally,
increased
flexural
strength
79
%
observed
for
3P
compared
EV.
Furthermore,
showed
malleability
reparability
could
be
thermomechanically
reprocessed
without
sacrificing
thermal,
mechanical,
properties.
Thus,
newly
developed
fire-safe
fulfills
sustainability
goals
today's
society.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2023,
Volume and Issue:
11(48), P. 17190 - 17198
Published: Nov. 16, 2023
Currently
reported
epoxidized
natural
rubber
(ENR)-derived
elastomeric
vitrimers
were
usually
limited
by
the
poor
mechanical
properties
and
utilization
of
nonrenewable
chemicals
to
introduce
dynamic
cross-links.
In
this
study,
we
report
fully
biobased
mechanically
robust
based
on
imine
bonds
prepared
from
ENR,
vanillin,
1,10-decanediamine.
The
fabrication
procedures
included
two
steps,
i.e.,
preparation
a
cross-linker
(DC)
vanillin
1,10-decanediamine
subsequent
cross-linking
ENR
with
DC.
(BEVs)
different
DC/ENR
ratios
prepared,
effects
DC
contents
tensile
properties,
elasticity,
stress
relaxation,
reprocessability
BEVs
investigated
in
detail.
BEV
showed
increased
strength
Young's
modulus
but
reduced
elongation
at
break
an
increasing
content.
up
19.44
±
1.39
MPa
higher
than
880%
was
achieved
controlling
ratio.
All
excellent
elasticity
strain
recovery
ratio
80%
after
stretching
500%.
could
relax
rapidly
high
temperatures,
which
endowed
them
thermal
recyclability.
With
combination
robustness,
reprocessability,
recyclability,
exhibit
potential
as
sustainable
substitutes
conventional
ENR-derived
permanently
cross-linked
rubbers.
Journal of Materials Chemistry A,
Journal Year:
2023,
Volume and Issue:
11(46), P. 25356 - 25367
Published: Jan. 1, 2023
Vitrimer-like
elastomer
composites
with
lignin
as
a
renewable
bio-filler,
showing
effective
reinforcement,
recyclability
and
photothermal
performance,
were
prepared.
ACS Applied Polymer Materials,
Journal Year:
2024,
Volume and Issue:
6(14), P. 8159 - 8168
Published: July 12, 2024
Epoxy
vitrimers
combine
the
advantages
of
thermosetting
and
thermoplastic
materials,
making
them
an
ideal
alternative
to
traditional
resins.
However,
fabrication
high-performance
flame-retardant
epoxy
remains
a
challenge.
In
this
study,
utilizing
(2-carboxyethyl)phenylphosphinic
acid
(CEPPA)
as
curing
agent,
we
facilely
fabricated
dual-dynamic
vitrimer
incorporating
carboxylate
esters
phosphonate
(CEEP).
Compared
resin
(DDEP),
exhibited
tensile
strength
comparable
resins
significantly
outperformed
in
terms
Young's
modulus.
comparison
ester
(PAEP),
CEEP
demonstrated
improved
solvent
resistance
ability
for
recycling
without
need
catalyst.
Additionally,
outstanding
flame
retardancy,
achieving
V-0
rating
UL-94
testing,
with
remarkable
66.9%
reduction
peak
heat
release
rate
(PHRR)
significant
34.5%
decrease
total
(THR)
cone
calorimetry
test
compared
DDEP.
The
work
offers
promising
way
facile
vitrimers.
