ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 30, 2024
Biovitrimer
pads
with
high
flame
retardancy
and
thermal
conductivity
were
developed
using
tannic
acid
(TA),
phosphoric
(PA),
poly(vinyl
alcohol)
(PVA).
For
the
first
time,
it
was
discovered
that
this
type
of
pad
is
formed
through
dynamic
bonding
P–O–C
covalent
bonds.
The
vitrimer
transition
temperature
(Tv),
which
indicates
bonding,
controlled
within
74–91
°C
range
by
adjusting
TA,
PA,
PVA
composition
ratio.
Below
Tv,
exhibited
excellent
elastic
recovery
properties,
a
rate
over
90%
when
subjected
to
100%
strain.
material
demonstrated
tensile
strength
8
MPa
430%
elongation
at
break.
Interestingly,
samples
deformed
100
(above
Tv)
then
rapidly
cooled
showed
shape
memory
effect,
returning
their
original
form
reheated
above
Tv.
Thanks
in
vitrimer,
these
materials
achieved
limiting
oxygen
index
values
exceeding
55%
highest
V-0
rating
UL-94
test,
demonstrating
not
seen
existing
vitrimers.
Combining
biovitrimer
hexagonal
boron
nitride
(h-BN)
produced
composite
film
up
3.8
W/m·K,
proving
its
effectiveness
as
heat
dissipation
pad.
Additionally,
vitrimer's
properties
allowed
for
complete
both
h-BN
recycling.
A
closed-loop
recycling
process
same
performance
could
be
remanufactured
reclaimed
h-BN.
Macromolecules,
Год журнала:
2025,
Номер
58(4), С. 1923 - 1934
Опубликована: Фев. 5, 2025
Developing
closed-loop
recyclable
thermosets
and
understanding
their
structure–property
relationships
are
essential
steps
in
advancing
a
circular
materials
economy.
Here,
we
present
vinylogous
urethane
(VU)
thermoset
with
recyclability,
synthesized
through
the
reaction
of
polytetrahydrofuran
bisacetoacetate
(aPTHF)
tris(2-aminoethyl)amine
(TREN).
These
VU
polymers
exhibit
high
elasticity,
only
3–9%
residual
strain
observed
after
cyclic
tensile
testing
at
maximum
100%,
depending
on
molecular
weight
aPTHF
network
cross-link
density.
The
two
structural
parameters
also
allow
modulation
mechanical
stress-relaxation
properties
elastomers.
To
investigate
hydrolysis
linkages
within
hydrophobic
matrix,
employed
heterogeneous
system
using
biphasic
mixture
HCl
CDCl3.
Our
findings
show
that
VUs
remain
stable
pure
water
but
can
be
dissociated
under
acidic
conditions,
dissociation
rate
accelerated
higher
temperatures
and/or
presence
concentrations.
detailed
investigations
indicate
potential
elastomers
as
sustainable
substrates
for
wearable
sensors.
We
therefore
conduct
case
study
synthesizing
sensor
incorporation
multiwalled
carbon
nanotubes
(MCNs)
into
elastomer
matrix.
robustly
detect
various
movements.
Moreover,
treatment
both
neat
polymer
composite
diethyl
ether
solvent
allows
excellent
recovery
(>90%)
TREN
(86%),
without
discernible
damage
to
MCNs
reclaimed
from
latter.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(51)
Опубликована: Сен. 28, 2023
Although
a
variety
of
dynamic
covalent
bonds
have
been
successfully
used
in
the
development
diverse
sustainable
thermosetting
polymers
and
their
composites,
solving
trade-off
between
recovery
efficiency
comprehensive
properties
is
still
major
challenge.
Herein,
"one-stone-two-birds"
strategy
lower
rotational
energy
barrier
(Er
)
phosphate-derived
Diels-Alder
(DA)
cycloadditions
was
proposed
for
easily
recyclable
carbon
fiber
(CF)-reinforced
epoxy
resins
(EPs)
composites.
In
such
strategy,
phosphate
spacer
with
Er
accelerated
segmental
mobility
DA
exchange
reaction
network
rearrangement
to
achieve
high-efficiency
repairing,
reprocessing
EPs
matrix
its
composites
rapid
nondestructive
recycling
CF;
meanwhile,
incorporating
phosphorus-based
units
especially
reduced
fire
hazards.
The
resulting
materials
simultaneously
showed
excellent
thermal/mechanical
properties,
superb
safety
facile
recyclability,
realizing
concept
high-performance
This
great
significance
understanding
enriching
molecular
connotation
chemistry,
making
it
potentially
applicable
design
wide
range
adaptable
toward
practical
cutting-edge-tech
applications.
Macromolecular Rapid Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 6, 2025
The
combination
of
gold
nanoparticles
(Au-NPs)
and
block
copolymer
(BCP)-based
vinylogous
urethane
vitrimers
leads
to
advanced
nanocomposites
where
the
thermal,
mechanical,
thermo-mechanical
properties
are
enhanced
without
interfering
with
formation
groups
transamination
in
dynamic
polymer
network.
Photoiniferter
reversible
addition-fragmentation
chain
transfer
polymerization
(photoRAFT)
inverse
Turkevich
synthesis
used
this
work
fabricate
desired
BCPs
spherical
Au-NPs.
key
feature
is
integration
Au-NPs
into
matrix
as
fixed
parts
hybrid
network,
ensuring
full
recyclability.
A
wide
range
can
be
tuned
by
variations
content,
monomers,
BCP
architecture.
After
ligand
exchange,
network
formation,
reprocessing
through
heat
compression,
unique
optical
retained,
allowing
plasmonic
heating
trigger
exchange
reaction
within
materials.
As
a
result,
Au-doped
self-heal
exhibit
shape-memory
shortly
after
exposure
not
only
but
also
light.
This
incorporation
could
provide
versatile
platform
for
development
materials
offering
potential
applications
coatings,
sensors,
electronic
devices,
etc.
Polymers for Advanced Technologies,
Год журнала:
2024,
Номер
35(1)
Опубликована: Янв. 1, 2024
Abstract
With
the
rise
in
momentous
resource
wastage
and
severe
environmental
pollution,
a
viable
path
for
sustainability
is
through
use
of
reprocessable
recyclable
materials
like
vitrimers.
Herein,
we
demonstrated
synthesis
dynamic
disulfide‐containing
epoxy
resin
by
condensing
an
amide
derivative
2,2′‐dithiodibenzoic
acid
with
epichlorohydrin.
The
aforementioned
was
cured
utilizing
two
bio‐based
curing
agents
poly(amido
amine)
cystamine
to
produce
three
distinct
reactive
diluent
reduced
generation
volatile
organic
compounds
during
process.
existence
disulfide
bond
aliphatic
moiety
vitrimers
established
high
elongation
at
break
good
tensile
strength.
Owing
bond,
exhibited
self‐healing
properties
healing
efficiency
71.48%
along
shape
memory
abilities.
Additionally,
exchange
reaction
allowed
polymer
chain
architecture
topologically
reorganize,
making
them
degradable.
Moreover,
these
have
ability
shield
ultraviolet
radiation
as
well
inhibits
oxidation,
chemical
resistance
properties.
investigated
thermoset
thus
provides
lot
potential
application
durable
thin
film
material.
Polymer,
Год журнала:
2024,
Номер
308, С. 127311 - 127311
Опубликована: Июнь 26, 2024
Vitrimers
based
on
block
copolymers
give
access
to
adaptable
polymer
networks
where
the
resulting
properties
can
be
adjusted
not
only
by
vitrimer
chemistry
itself
but
also
influenced
structure
of
copolymer.
In
this
work,
linear
AB,
ABA,
and
BAB
are
introduced
as
backbones
in
vinylogous
urethane
vitrimers
produce
crosslinked
materials
that
reprocessable
have
a
wide
range
tunable
mechanical
properties.
The
narrow-disperse
were
synthesized
photoiniferter
reversible
addition-fragmentation
chain
transfer
polymerization
(photoRAFT).
Two
different
types
hydrophobic
A
blocks,
poly(methyl
methacrylate)
poly(ethyl
with
higher
glass
transition
temperature
compared
hydrophilic
B
block,
poly(2-hydroxyethyl
methacrylate),
chosen.
carries
functional
groups
for
further
modification
obtain
acetoacetylated
side
groups,
which
then
transformed
crosslinks.
It
has
been
found
architectures
well
alkyl
substituents
influence
final
performance
vitrimers.
By
adjusting
sequences,
varied
from
hard
tough
elastic
corresponding
BAB,
AB
copolymer
vitrimers,
respectively.
These
self-healing
shape-memory
Macromolecular Materials and Engineering,
Год журнала:
2024,
Номер
309(9)
Опубликована: Фев. 25, 2024
Abstract
Fiber‐reinforced
polymer
composites
(FRPCs)
are
versatile
materials
with
applications
in
diverse
fields
such
as
transportation,
construction,
and
electronics.
With
the
market
expected
to
reach
15.5
Mt
by
2026,
increasing
sustainability
of
FRPCs
is
imperative.
The
main
factors
driving
FRPCs,
namely
end‐of‐life
management
recyclability,
use
natural,
bio‐based,
sustainable
materials,
well
biodegradability
product
simplification
presented
discussed.
