Macromolecular Chemistry and Physics,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 17, 2025
Abstract
Dynamic
covalent
polymer
networks
(DCPNs)
are
a
class
of
cross‐linked
polymeric
materials
with
good
self‐healing
properties,
processability,
and
recyclability.
These
generally
possess
dynamic
bonds
which
can
undergo
reversible
cleavage
reformation
under
certain
conditions.
The
cross‐linking
nature
the
endows
them
needed
mechanical
strength
as
well
processibility,
effectively
bridging
gap
between
traditional
thermosets
thermoplastics.
However,
in
many
cases,
relying
on
alone
cannot
always
achieve
satisfactory
material
so
modification
DCPNs
has
been
one
hot
spots
this
area.
This
review
summarizes
recent
research
progress
DCPNs,
including
introduction
multiple
filler
blending,
analyzes
how
modifications
improve
specific
properties.
provides
comprehensive
overview
diverse
methods
to
manipulate
structures
properties
may
expand
their
potential
applications.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Июнь 7, 2024
The
regulation
of
topological
structure
covalent
adaptable
networks
(CANs)
remains
a
challenge
for
epoxy
CANs.
Here,
we
report
strategy
to
develop
strong
and
tough
supramolecular
thermosets
with
rapid
reprocessability
room-temperature
closed-loop
recyclability.
These
were
constructed
from
vanillin-based
hyperbranched
resin
(VanEHBP)
through
the
introduction
intermolecular
hydrogen
bonds
dual
dynamic
bonds,
as
well
formation
intramolecular
cavities.
structures
confer
remarkable
energy
dissipation
capability
thermosets,
leading
high
toughness
strength.
Due
imine
exchange
reversible
noncovalent
crosslinks,
can
be
rapidly
effectively
reprocessed
at
120
°C
within
30
s.
Importantly,
efficiently
depolymerized
room
temperature,
recovered
materials
retain
structural
integrity
mechanical
properties
original
samples.
This
may
employed
design
tough,
recyclable
practical
applications.
Macromolecules,
Год журнала:
2024,
Номер
57(11), С. 5450 - 5460
Опубликована: Май 29, 2024
The
development
of
sustainable
composites
necessitates
biobased
epoxy
resins
that
are
highly
recyclable
and
degradable;
however,
the
integration
mechanical,
reprocessing,
rapid
degradation
properties
into
a
single
resin
remains
significant
challenge.
present
study
proposes
straightforward
approach
to
overcoming
problem
by
combining
two
labile
covalent
bonds
an
resin.
combination
acetal
disulfide
demonstrates
synergistic
effect
on
performance
resin,
leading
ultrafast
polymer.
carbon
fiber-reinforced
composite
with
matrix
shows
tensile
strength
exceeding
630
MPa,
but
degrades
completely
within
just
8
min,
while
recovered
fibers
display
nondestructive
characteristics
similar
those
original
material.
Moreover,
we
designed
good
self-healing
reprocessing
ability.
Scratches
surface
can
be
self-healed
heating,
powdered
reshaped
under
hot
press.
These
findings
offer
new
preparation
composites,
highlighting
importance
thermosetting
polymers.
Polymer Chemistry,
Год журнала:
2024,
Номер
15(13), С. 1347 - 1357
Опубликована: Янв. 1, 2024
A
dual-dynamic
bio-based
epoxy
building
block
(DDBB)
with
both
imine
and
disulfide
bonds
synthesized
from
cystamine
vanillin
showed
accelerated
dynamic
exchanges
in
vitrimer
formulations.
ACS Applied Polymer Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 8, 2025
In
order
to
reduce
dependence
on
petroleum
resources,
three
different
biobased
epoxy
monomers
(Eu-EP-1,
Eu-EP-2,
and
Eu-EP-3)
with
a
carbon
content
of
76.9%–83.3%
were
prepared
from
eugenol,
which
can
be
derived
lignin.
Three
eugenol-based
thermosets
(Eu-EP-1/IPDA,
Eu-EP-2/IPDA,
Eu-EP-3/IPDA)
then
obtained
by
curing
Eu-EP
monomer
commercial
IPDA
(isophorone
diamine)
hardener;
the
activation
energy
was
in
range
37.4–48.2
kJ/mol,
gel
ranged
95.4%–96.5%,
cross-linking
degree
reached
1185–2119
mol/m3,
confirming
that
cured
form
network
structures.
Therefore,
Eu-EP/IPDA
had
excellent
in-service
performance
Tg
63.9–76.3
°C
tensile
strength
34.7–43.1
MPa.
However,
permanent
chemical
bonds
difficult
recycle.
Since
Eu-EP-2/IPDA
balanced
performance,
Eu-EP-2
selected
develop
recyclable
Eu-EP/AFD
vitrimers
AFD
(4,4′-dithiodiphenylamine).
The
resulting
Eu-EP-2/AFD1.00
vitrimer
79.4
39.2
MPa,
remodeling
could
achieved
hot
pressing
at
200
for
6
h;
self-healing
scratched
material
heating
180
2
h,
dissolved
mercaptoethanol.
is
potential
sustainable
development
materials
recyclability.
This
study
offers
facile
solution
materials.
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.
Journal of Applied Polymer Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 23, 2025
ABSTRACT
Epoxy
resins
are
widely
utilized
in
many
fields
due
to
their
good
mechanical
properties,
thermal
and
chemical
stability.
However,
most
of
the
reported
epoxy
characterized
as
nondegradable
nonrecyclable
thermosetting
materials,
causing
great
environmental
pollution
resource
waste.
Herein,
we
report
a
fully
bio‐based
recoverable
resin
using
monomer
curing
agent.
The
(VAN‐TA‐EP)
was
synthesized
by
Schiff
base
reaction
based
on
vanillin
(VAN)
Tris(2‐aminoethyl)amine
(TA)
further
epoxidated.
imine
agent
(DI)
from
diformylfuran
(DFF)
isophorone
diamine
(IPDA).
resultant
TA/DI
that
composed
VAN‐TA‐EP
DI,
showed
high
performance,
degradability,
recyclability.
tensile
strength
prepared
reached
maximum
104
MPa,
which
is
significantly
higher
than
conventional
DGEBA/DDM
(59
MPa).
demonstrated
be
heated
reshaped
metathesis,
experimentally
confirmed.
Furthermore,
cross‐linked
have
degradability
acid‐
or
base‐induced
hydrolysis
bonds.
This
study
paves
way
for
preparation
high‐performance
recyclable
resins.
ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
6(9), С. 4964 - 4974
Опубликована: Апрель 25, 2024
The
inherent
disadvantages
of
low
toughness
and
high
brittleness
severely
limit
the
widespread
applications
epoxy
resins
(EPs),
it
is
highly
desirable
to
toughen
EPs
while
maintaining
their
rigidity
thermal
properties.
Herein,
a
type
functionalized
poly[1-hexene-alt-N-(2-methoxymethyl
oxirane)maleimide]
(PHMIEP)
was
specially
designed
synthesized
by
self-stabilized
precipitation
polymerization
(2SP)
1-hexene
maleic
anhydride,
followed
imidization,
hydroxymethylation,
epoxidation.
Due
presence
both
rigid
cyclic
maleimide
units
flexible
pendant
butyl
groups,
PHMIEP
can
serve
as
an
effective
toughening
modifier
for
EPs.
With
4,4-diaminodiphenylmethane
curing
agent,
with
5
phr
showed
record-high
impact
strength
tensile
54.04
kJ/m2
95.84
MPa,
which
were
121
23%
higher
than
neat
EPs,
respectively.
Moreover,
PHMIEP-modified
exhibited
similar
stability
glass-transition
temperature
those
More
impressively,
resultant
superior
hydrophobicity
in
comparison
unmodified
due
incorporation
hydrophobic
imide
alkyl
segments.
Furthermore,
order
reduce
preparation
cost,
complex
olefinic
mixtures
derived
from
cracking
product
raffinate
oil
used
directly
replace
1-hexene.
modified
poly[cracked
oil-alt-N-(2-methoxymethyl
(PRMIEP)
also
excellent
comprehensive
enhanced
toughness,
strength,
comparable
stability,
PHMIEP/PRMIEP-toughened
demonstrate
great
potential
high-performance
resin
matrix
application
fields
electronic
packaging,
coating,
engineering
plastics.