The
current
plastic
economy
heavily
relies
on
nonrenewable
fossil-based
feedstocks
and
hence
urgently
needs
to
transition
a
circular
economy.
This
shift
necessitates
the
utilization
of
renewable
for
plastics
manufacturing
implementation
end-of-life
strategies
promote
sustainability.
In
this
study,
we
present
synthesis
characterization
biobased
polycarbonates
containing
spirocyclic
acetals,
which
allow
multipathway
orthogonal
chemical
recycling.
These
polymers,
prepared
via
two
distinct
synthetic
routes,
exhibit
excellent
thermal
properties
due
their
rigid
structures,
with
Tg
values
ranging
from
154
192
°C.
Notably,
molecular
design
these
poly(acetal-carbonate)s
facilitates
efficient
selective
depolymerizations
under
both
acidic
basic
conditions
through
hydrolysis
transesterification,
respectively,
thus
providing
dual
closed-loop
recycling
system.
By
introducing
different
nucleophiles,
additionally
upcycling
into
value-added
carbonate
or
urea
derivatives.
strategic
approach,
aiming
at
obtaining
various
monomeric
compounds
depolymerization,
opens
door
creation
new
generations
sustainable
polymer
products.
advancement
in
material
emphasizes
significance
effectively
managing
stages
plastics.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(22)
Опубликована: Март 16, 2024
Recycling
of
carbon
fiber-reinforced
polymer
composites
(CFRCs)
based
on
thermosetting
plastics
is
difficult.
In
the
present
study,
high-performance
CFRCs
are
fabricated
through
complexation
aromatic
pinacol-cross-linked
polyurethane
(PU-AP)
thermosets
with
fiber
(CF)
cloths.
PU-AP
exhibit
a
breaking
strength
95.5
MPa
and
toughness
473.6
MJ
m
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.
ACS Materials Letters,
Год журнала:
2024,
Номер
6(8), С. 3899 - 3908
Опубликована: Июль 25, 2024
Traditional
commercial
thermosetting
materials
are
currently
facing
significant
challenges
in
terms
of
reprocessing,
degradation,
and
recycling
because
a
large
demand
petroleum
resources,
leading
to
environmental
burden.
In
our
work,
trialdehyde
monomer
synthesized
by
renewable
resource
reacted
with
1,4-Bis(4-amino-2-trifluoromethylphenoxy)benzene
1,4-Bis(4-aminophenoxy)benzene
form
dynamic
cross-linked
network
called
BQPs.
The
fluorinated
biobased
polyimine
material
exhibits
exceptional
mechanical
properties
tensile
strength
96.2
MPa,
which
is
much
higher
than
plastics
such
as
polycarbonate
(∼65
MPa).
Moreover,
it
demonstrates
excellent
flame
retardancy
achieving
level
V0
rating
the
UL-94
test
value
50%
limiting
oxygen
index
test.
Additionally,
can
be
easily
reprocessed
within
10
min
at
high
temperature
(160
°C)
rapidly
repaired
solvent.
Overall,
this
high-performance
product
will
significantly
contribute
expanding
development
materials.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(34)
Опубликована: Апрель 26, 2024
Abstract
It
remains
a
huge
challenge
to
efficiently
recycle
the
printed
circuit
boards
(PCBs)
because
of
diversity
and
complexity
PCBs
in
terms
material
composition.
The
recycling
highly
depends
on
design
polymers
that
make
up
polymer
substrates
conductive
pastes.
Herein,
closed‐loop
recyclable
plastics
for
use
as
preparation
pastes
are
fabricated
by
dynamically
cross‐linking
phenylboronic
acid‐functionalized
poly(methylmethacrylate)
(PMMA‐B)
poly(urea‐urethane)
(PUU‐B)
with
boroxines.
plastic,
which
is
denoted
PMMA‐PUU
exhibits
breaking
strength
71.0
MPa
Young's
modulus
1.8
GPa.
Because
dynamic
nature
boroxines,
0.6
plastic
can
be
depolymerized
N,
N‐dimethylacetamide/ethanol
mixture
solvent.
PMMA
PUU
recovered
high
yields
purity
through
their
solubility
differences
selective
solvents.
Conductive
suitable
printing
electrical
circuits
complexation
Ag
particles
PMMA‐PUU.
composed
PMMA‐PUU‐based
flexible,
healable,
recyclable.
enables
collection
purified
particles,
PMMA‐B,
PUU‐B
monomers
even
when
mixed
wastes.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 24, 2025
Abstract
Efficient
recycling
of
carbon
fiber‐reinforced
polymer
composites
(CFRCs)
into
their
original
monomers
and
fibers
(CFs)
in
a
non‐destructive
manner
remains
significant
challenge.
In
this
study,
high‐performance,
closed‐loop
recyclable
aromatic
polyamide
(APAD)
plastics
are
synthesized
via
polycondensation
amines
aldehydes
through
dynamic
imine
bonds.
Due
to
fully
structure
as
well
interchain
hydrogen
bonds
π–π
interactions,
APAD
exhibit
tensile
strength
≈78.3
MPa,
glass
transition
temperature
(
T
g
)
≈200.4
°C,
excellent
chemical
resistance.
The
can
be
depolymerized
mixture
polar
organic
solvents
acids
at
ambient
temperature,
enabling
high‐purity
recovery
precipitation
selective
solvents.
Water‐resistant
CF/APAD
fabricated
complexation
with
CF
cloths.
These
mechanical
properties
comparable
those
CF/epoxy
thermoset
superior
thermal
stability.
mild
depolymerization
conditions
for
enable
the
efficient
disintegration
composites.
Therefore,
CFs
realized.
recovered
cloths
used
re‐manufacture
This
study
presents
an
effective
method
CFRCs,
offering
environmental
economic
benefits.
Abstract
Dynamic
covalent
polymers
(DCPs)
that
strike
a
balance
between
high
performance
and
rapid
reconfiguration
have
been
challenging
task.
For
this
purpose,
solution
is
proposed
in
the
form
of
new
dynamic
supramolecular
motif—guanidine
urea
structure
(GUAs).
GUAs
contain
complex
diverse
chemical
structures
as
well
unique
bonding
characteristics,
allowing
guanidine
to
demonstrate
advanced
physical
properties.
Noncovalent
interaction
aggregates
(NIAs)
confirmed
GUA‐DCPs
through
multistage
H‐bonding
π‐π
stacking,
resulting
an
extremely
Young's
modulus
14
GPa,
suggesting
remarkable
mechanical
strength.
Additionally,
guanamine
linkages
GUAs,
type
bond,
provide
resins
with
excellent
malleability
reprocessability.
Guanamine
metathesis
validated
using
small
molecule
model
compounds,
temperature
dependent
infrared
rheological
behavior
following
dissociative
exchange
mechanism.
Moreover,
inherent
photodynamic
antibacterial
properties
are
extensively
verified
by
experiments.
Even
after
undergoing
three
reprocessing
cycles,
rate
remains
above
99%
24
h,
highlighting
their
long‐lasting
effectiveness.
nature,
tuneable
composition,
combination
make
them
promising
candidates
for
various
technological
advancements.
Abstract
Organic
aerogels
are
emerging
as
promising
materials
due
to
their
versatile
properties,
rendering
them
excellent
candidates
for
a
variety
of
applications
in
the
fields
thermal
insulation,
energy
storage,
pharmaceuticals,
chemical
adsorption,
and
catalysis.
However,
current
aerogel
designs
rely
on
cross‐linked
polymer
networks,
which
lack
efficient
end‐of‐use
solutions,
thereby
hindering
overall
sustainability.
In
this
study,
facile
synthesis
organic
with
unique
combination
imine
cyanurate
moieties
is
presented,
resulting
high‐performance,
lightweight
insulating
materials.
The
aerogels’
structure,
ensures
mechanical
robustness,
resistance,
hydrophobicity
without
additional
treatments,
crucial
long‐term
performance.
Additionally,
response
currently
unsustainable
use
materials,
molecular
design
offers
diverse
avenues
recycling.
These
include
full
depolymerization
back
into
original
monomers,
partial
network
fragmentation
producing
soluble
oligomers
that
can
be
promptly
employed
fabricate
new
aerogels,
upcycling
waste
useful
building
blocks.
This
work
pioneers
novel
approach
material
design,
emphasizing
recyclability
core
feature
while
maintaining
high‐performance
excellence.
Advanced Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 19, 2024
Abstract
Designing
and
making
sustainable
plastics
is
especially
urgent
to
reduce
their
ecological
environmental
impacts.
However,
it
remains
challenging
construct
with
simultaneous
high
sustainability
outstanding
comprehensive
performance.
Here,
a
composite
strategy
of
in
situ
polymerizing
petroleum‐based
monomer
the
presence
an
industrialized
bio‐derived
polymer
quasi‐solvent‐free
system
introduced,
affording
plastic
excellent
mechanical
robustness,
impressive
thermal
solvent
stability,
as
well
low
energy,
consumes
during
production,
processing,
recycling.
Particularly,
can
be
easily
processed
into
diverse
shapes
through
3D
printing,
injection
molding,
etc.
polymerization
further
reprocessed
other
complex
structures
via
eco‐friendly
hydrosetting.
In
addition,
mechanically
robust
Young's
modulus
up
3.7
GPa
tensile
breaking
strength
150.2
MPa,
superior
many
commercially
available
plastics.
It
revealed
that
hierarchical
hydrogen
bonds
predominate
well‐balanced
This
work
provides
new
path
for
fabricating
high‐performance
toward
practical
applications,
contributing
circular
economy.
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.
