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.
Macromolecular Chemistry and Physics,
Journal Year:
2023,
Volume and Issue:
224(17)
Published: July 6, 2023
Abstract
Traditional
chemically
cross‐linked
polymer
materials
may
cause
severe
environmental
pollution
and
economic
losses
due
to
the
difficulty
of
recycling.
Vitrimers
containing
reversible
dynamic
covalent
bonds
are
processable,
recyclable,
self‐healing.
In
this
article,
a
bio‐based
epoxy
resin
curing
agent
is
synthesized
by
hydrolysis
using
cellulose
as
raw
material.
The
results
show
that
vitrimers
with
best
ratio
have
lower
topological
transition
temperature
fast
relaxation
time
at
140
°C.
After
soaking
in
solvent
for
90
days,
gel
content
material
greater
than
81%.
glass
sample
measured
differential
scanning
calorimetry
（DSC)
83
It
also
has
high
initial
decomposition
(350
°C)
good
flexibility
resistance,
showing
its
performance
coating
paint.
Journal of Applied Polymer Science,
Journal Year:
2023,
Volume and Issue:
140(42)
Published: Sept. 8, 2023
Abstract
Natural
rubber
(NR)
distinguishes
itself
from
a
synthetic
one
in
that
it
contains
non‐rubber
components
and
is
subject
to
strain‐induced
crystallization
(SIC).
Non‐rubber
may
have
great
influence
on
the
physicochemical
properties
SIC
behavior
of
NR.
However,
underlying
mechanisms
remain
poorly
understood.
This
work
uses
protease
treat
so
as
control
their
content.
The
mechanical
properties,
dynamic
kinetics
resulting
NR
are
compared.
treatment
shortens
solidification
time
latex.
Thus,
higher
phospholipid
content
retained.
A
yields
better
properties.
Protease‐treated
shows
at
lower
strain
crystallinity
same
strain.
indicates
phospholipids
greater
impact
than
proteins,
namely
they
speed
up
vulcanization
SIC.
Polymers,
Journal Year:
2024,
Volume and Issue:
16(23), P. 3362 - 3362
Published: Nov. 29, 2024
Thermally
conductive
composites
were
prepared
based
on
epoxidized
natural
rubber
(ENR)
filled
with
alumina,
silica,
and
hybrid
alumina
silica.
The
thermal
conductivity
mechanical
properties
assessed.
It
was
observed
that
the
interactions
of
polar
functional
groups
in
fillers
epoxy
group
ENR
supported
a
fine
dispersion
filler
matrix.
improved
alumina/silica
loadings.
ENR/Silica
composite
at
50
phr
silica
provided
highest
60
shore
A
hardness,
maximum
100%
modulus
up
to
0.37
MPa,
tensile
strength
27.3
while
ENR/Alumina
gave
best
conductivity.
25/25
significantly
an
composite.
That
is,
ENR/Hybrid
2.23
W/mK,
much
higher
than
gum
(1.16
W/mK).
experimental
results
further
analyzed
using
ANOVA
it
found
showed
significant
increases
compared
ENR.
Moreover,
contributed
when
both
composites.
system
also
favors
process
ability
energy
savings.
As
result,
is
alternative
thermally
elastomeric
material
expensive
silicone
rubber,
could
have
commercial
applications
fabrication
electronic
devices,
solar
conversion,
rechargeable
batteries,
sensors.
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.
