Macromolecules,
Journal Year:
2024,
Volume and Issue:
57(21), P. 9950 - 9959
Published: Oct. 16, 2024
This
work
discloses
a
new
strategy
based
on
dynamic
cross-linking
chemistry
to
achieve
advanced
one-component
thermosets
combining
ultralong
storage
life
and
fast
cross-linking.
One-component
containing
resin
cross-linker
in
one
pot
have
the
features
of
simple
operation,
stable
quality,
low
waste;
however,
an
urgently
needed
with
long
at
room
temperature
medium–low
temperatures
(≤130
°C)
remains
enormous
challenge.
Herein,
we
innovatively
propose
controlled
dissolution
address
this
issue.
As
example,
cross-linked
(DCC)
is
synthesized
via
Diels–Alder
reaction
hide
high
activity
commercial
amine-type
cross-linker.
A
thermoset
from
DCC
diepoxy
monomer
can
be
stored
for
time
rapidly
below
130
°C.
Moreover,
also
serve
as
latent
accelerator
epoxy/anhydride
same
control
system
no
elevated
temperatures.
beneficial
promoting
application
meeting
urgent
need
fields
composites,
coatings,
electronic
packaging
materials,
automotive
adhesives,
etc.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: April 19, 2024
Abstract
Mussel‐inspired
materials
have
been
widely
studied
due
to
their
excellent
adhesion
and
self‐healing
properties,
but
few
studies
introduced
this
interesting
property
into
the
fracturing
development
of
deep/ultra‐deep
oil
gas
fields.
Herein,
a
new
type
mussel‐inspired
delayed
crosslinking
gel
fluid
is
reported,
which
formed
by
polymers
containing
many
catechol
groups
organic
zirconium
crosslinkers.
The
strong
supramolecular
interaction
in
can
construct
more
complex
stable
dually
cross‐linked
polymer
network
based
on
conventional
chemical
crosslinking,
cope
with
harsh
conditions
such
as
high
temperature
shear
reservoirs.
After
shearing
at
200
°C,
reserved
viscosity
95
mPa·s.
More
importantly,
remains
basically
unchanged
25
cross‐linking
completed
within
300
s
90
°C.
force
probe
atomic
microscope
(AFM)
technology
has
successfully
demonstrated
that
are
main
source
polymers.
molecular
simulation
results
show
addition
groups,
hydrogen
bond
interactions
molecules
enhanced.
And
additional
bonds
temperature.
Macromolecules,
Journal Year:
2024,
Volume and Issue:
57(10), P. 5063 - 5072
Published: April 25, 2024
Recyclable
elastomers
based
on
adaptable
covalent
networks
fabricated
via
different
types
of
dynamic
bonds
have
been
designed
and
prepared
to
resolve
the
urgent
problems
generated
by
waste
elastomers.
However,
due
inevitable
side
reactions
during
thermal
recycling
(e.g.,
oxidation,
permanent
cross-linking),
mechanical
recovery
efficiency
after
is
normally
<90%
for
most
recyclable
elastomers,
making
it
difficult
achieve
comparable
performance.
Herein,
we
report
a
novel
semi-interpenetrating
network
design
that
achieves
reinforcement
topology
isomerization
formation
new
cross-linking
points.
The
includes
an
aromatic
disulfide
bond-containing
polyurethane
long
linear
chains
with
side-chain
vinyl
groups.
Triggered
heat
reprocessing,
inside
cross-linked
break
phenyl
sulfur
radicals
undergo
thiol–ene
groups
in
chains,
resulting
increased
density.
Electron
paramagnetic
resonance
testing,
situ
Fourier
transform
infrared
spectrometry,
high-temperature
stress
relaxation
density
measurements
were
utilized
monitor
process.
tensile
strength
extensibility
efficiencies
reached
186
131%
original
values
reprocessing
twice,
realizing
recycling.
Interestingly,
similar
mechanism,
fatigue
repeated
stretch
release
cycles
was
efficiently
eliminated
upon
treatment.
Such
strategy
achieving
polymer
reinforced
physical
properties
will
benefit
practical
applications
sustainable
other
thermosetting
materials.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 18, 2025
Abstract
Composite
phase‐change
materials
(CPCMs),
with
their
substantial
latent
heat
storage
and
release
capabilities
at
a
consistent
transition
temperature,
are
extensively
employed
in
diverse
thermal‐energy‐storage
applications.
However,
the
risk
of
thermal
runaway
remains
significant
challenge
owing
to
flammability
potential
leakage
CPCMs.
Attempts
develop
flame‐retardant
PCMs
using
various
fireproof
polymers
through
physical
methods
exist.
In
this
study,
novel
multifunctional
solid–solid
material
is
developed
chemical
modification
process,
incorporating
polyethylene
glycol
2000,
boric
acid,
phosphorus
pentoxide
(P
2
O
5
),
expanded
graphite,
ammonium
polyphosphate
(APP),
melamine
(MA).
This
composite
exhibits
superior
flame
retardancy
stability,
making
it
highly
suitable
for
enhancing
safety
battery
modules.
Experimental
results
demonstrate
that
PCAM2,
containing
20
wt%
MA
8
APP,
maintains
97.75%
mass
retention
250
°C
h
achieves
V‐0
rating
(burning
stops
within
10
s)
according
UL‐94
standard.
Moreover,
module
PCAM2
demonstrated
thermal‐management
than
three
other
Even
after
ten
cycles
2C
discharge
rate,
maintained
peak
operating
temperature
below
60
°C.
Notably,
CPCM
films
exhibited
propagation
time,
indicating
control
ability
inhibit
runway.
The
intrinsically
study
holds
considerable
promise
use
next‐generation
systems
electric‐vehicle
packs
energy‐storage
Advanced Science,
Journal Year:
2024,
Volume and Issue:
11(38)
Published: Aug. 5, 2024
Developing
advanced
engineering
polymers
that
combine
high
strength
and
toughness
represents
not
only
a
necessary
path
to
excellence
but
also
major
technical
challenge.
Here
for
the
first
time
rigid-flexible
interlocking
polymer
(RFIP)
is
reported
featuring
remarkable
mechanical
properties,
consisting
of
flexible
polyurethane
(PU)
rigid
polyimide
(PI)
chains
cleverly
woven
together
around
copper(I)
ions
center.
By
rationally
weaving
PI,
PU
chains,
ions,
RFIP
exhibits
ultra-high
(twice
unwoven
polymers,
91.4
±
3.3
MPa),
(448.0
14.2
MJ
m
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(28)
Published: April 24, 2024
Abstract
Polymers
are
ideally
utilized
as
damping
materials
due
to
the
high
internal
friction
of
molecular
chains,
enabling
effective
suppression
vibrations
and
noises
in
various
fields.
Current
strategies
rely
on
broadening
glass
transition
region
or
introducing
additional
relaxation
components
enhance
energy
dissipation
capacity
polymeric
materials.
However,
it
remains
a
significant
challenge
achieve
efficiency
through
structural
control
while
maintaining
dynamic
characteristics.
In
this
work,
we
propose
new
strategy
develop
hyperbranched
vitrimers
(HBVs)
containing
dense
pendant
chains
loose
crosslinked
networks.
A
novel
yet
weak
transesterification
between
carboxyl
boronic
acid
ester
was
confirmed
used
prepare
HBVs
based
poly
(hexyl
methacrylate‐2‐(4‐ethenylphenyl)‐5,5‐dimethyl‐1,3,2‐dioxaborinane)
P(HMA‐
co
‐ViCL)
copolymers.
The
‐type
macromonomers,
crosslinking
points
formed
by
covalent
connection
via
associative
exchange,
exchange
reaction
three
keys
developing
high‐performance
HBV
We
found
that
20k‐40‐60
exhibited
ultrahigh
energy‐dissipation
performance
over
broad
frequency
temperature
range,
attributed
synergistic
effect
crosslinks.
This
unique
design
concept
will
provide
general
approach
advanced
