Epoxy Vitrimer with Excellent Mechanical Properties and High Tg for Detachable Structural Adhesives
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
17(9), С. 14578 - 14590
Опубликована: Фев. 22, 2025
It
is
a
long-standing
challenge
for
thermoset
resins
to
simultaneously
achieve
outstanding
thermomechanical
and
mechanical
properties
as
well
rapid
network
reconfiguration
due
the
trade-off
between
chemical
bond
transformation
stability
of
network.
The
design
vitrimer
topology
an
effective
strategy
address
above
issues.
Here,
we
prepared
epoxy
material
(DGEBA-API-MHHPA)
with
excellent
high
glass-transition
temperature
(Tg)
by
introducing
rigid-flexible
integrated
side
chains
[1-(3-aminopropyl)
imidazole
(API)],
which
endow
DGEBA-API-MHHPA
multiple
interactions
including
"internal
antiplasticization"
effect,
intermolecular
hydrogen
bonds,
π-π
interactions.
Moreover,
introduction
Zn2+
facilitates
transesterification,
enabling
fast
rearrangement
Specifically,
relaxation
time
DGEBA-API0.2-MHHPA0.8-Zn
reaches
65
s
at
200
°C.
Meanwhile,
Zn2+-imidazole
coordination
bonds
energy
dissipation
improve
toughness
resulting
exhibits
self-healing
recyclable
behaviors
possesses
80.3
MPa
tensile
strength,
3.25
GPa
Young's
modulus,
7.2
MPa·m1/2
fracture
(KIC),
Tg
129
Concurrently,
can
be
applied
detachable
structural
adhesives
various
substrates
used
matrixes
electrically
composites.
This
skillful
widely
referenced
in
large-scale
manufacturing
high-performance
dynamic
covalent
their
composites
performance.
Язык: Английский
High-modulus supramolecular glassy polymers: a review
Materials Chemistry Frontiers,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
The
concept
of
recyclability
or
repairability
provides
a
new
approach
for
extending
the
service
life
glassy
polymers
and
addressing
environmental
pollution
issues.
Язык: Английский
Nucleophilic Aromatic Substitution Tempering the Closed-Loop Recycling of Shape Memory Polymers
ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 13, 2024
The
dynamic
covalent
bond
(DCB)
strategy
endows
the
polymer
with
recyclability,
enabling
resourceful
recycling,
energy
conservation,
and
addressing
environmental
pollution
issues,
thereby
garnering
significant
attention
currently
in
field.
Here,
we
achieved
closed-loop
recycling
of
a
series
shape
memory
polymers
(SMPs)
through
nucleophilic
aromatic
substitution
(SNAr)
reaction.
First,
SNAr
reaction
facilitated
high-strength,
high-transition-temperature
cyanate
esters
(SMCEs)
their
composite
(SMCEC)
into
triethoxytriazine
(TETA)
diols.
recycled
monomers
can
then
be
used
to
synthesize
SMPs
tailored
mechanical
properties
broad
range
transition
temperatures,
including
epoxy
resins,
ester
elastomers,
4D
printing
elastomers.
TETA
again
from
elastomers
Furthermore,
devised
two
innovative
strategies
for
materials
produce
actuators
high
resolution.
Notably,
polyacrylate
elastomer,
which
undergoes
situ
cross-linking
after
postheating
reactions,
presents
groundbreaking
method
high-performance
utilizing
DCBs.
This
work
not
only
provides
an
achieving
but
also
introduces
interesting
approach
SMPs.
Язык: Английский