Angewandte Chemie,
Journal Year:
2023,
Volume and Issue:
136(7)
Published: Dec. 22, 2023
Abstract
Although
closed‐loop
recycling
of
dynamic
covalent
bond‐based
plastics
does
not
require
catalysts,
their
mechanical
strength
and
chemical
stability
remain
a
major
concern.
In
this
study,
recyclable
poly(aryl
imine)
(PAI)
with
high
excellent
resistance
are
fabricated
by
copolymerizing
aromatic
amines
aldehydes
through
imine
bonds.
The
resulting
PAI
plastic
tensile
58.2
MPa
exhibits
in
acidic
basic
aqueous
solutions
various
organic
solvents.
can
be
depolymerized
mixed
solvent
tetrahydrofuran
(THF)/HCl
solution
the
dissociation
bonds,
monomers
facilely
recovered
purity
isolated
yields
due
to
solubility
difference
between
selective
efficient
also
realized
monomer
conversion
because
hydrolysis
generates
amines.
used
re‐fabricate
original
plastics.
This
selectively
from
complicated
polymer
waste
streams
mild
depolymerization
conditions
its
most
Chemical Reviews,
Journal Year:
2024,
Volume and Issue:
124(12), P. 7829 - 7906
Published: June 3, 2024
Covalent
network
polymers,
as
materials
composed
of
atoms
interconnected
by
covalent
bonds
in
a
continuous
network,
are
known
for
their
thermal
and
chemical
stability.
Over
the
past
two
decades,
these
have
undergone
significant
transformations,
gaining
properties
such
malleability,
environmental
responsiveness,
recyclability,
crystallinity,
customizable
porosity,
enabled
development
integration
dynamic
chemistry
(DCvC).
In
this
review,
we
explore
innovative
realm
polymers
focusing
on
recent
advances
achieved
through
application
DCvC.
We
start
examining
history
fundamental
principles
DCvC,
detailing
its
inception
core
concepts
noting
key
role
reversible
bond
formation.
Then
reprocessability
DCvC
is
thoroughly
discussed,
starting
from
milestones
that
marked
evolution
progressing
to
current
trends
applications.
The
influence
crystallinity
then
reviewed,
covering
diversity,
synthesis
techniques,
functionalities.
concluding
section,
address
challenges
faced
field
speculates
potential
future
directions.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(28)
Published: May 17, 2024
Thermoset
elastomers
have
been
extensively
applied
in
many
fields
because
of
their
excellent
mechanical
strengths
and
durable
characteristics,
such
as
an
chemical
resistance.
However,
the
context
environmental
issues,
nonrecyclability
thermosets
has
become
a
major
barrier
to
further
development
these
materials.
Here,
well-tailored
strategy
is
reported
solve
this
problem
by
introducing
mismatched
supramolecular
interactions
(MMSIs)
into
covalently
cross-linked
poly(urethane-urea)
network
with
dynamic
acylsemicarbazide
moieties.
The
MMSIs
significantly
strengthen
toughen
thermoset
elastomer
effectively
dissipating
energy
resisting
external
stress.
In
addition,
recycling
efficiency
improved
2.7-fold
due
superior
reversibility
MMSIs.
optimized
features
outstanding
including
ultrahigh
tensile
strength
(110.8
MPa),
unprecedented
toughness
(1245.2
MJ
m
Macromolecules,
Journal Year:
2025,
Volume and Issue:
58(4), P. 1923 - 1934
Published: Feb. 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,
Journal Year:
2023,
Volume and Issue:
63(7)
Published: Dec. 22, 2023
Although
closed-loop
recycling
of
dynamic
covalent
bond-based
plastics
does
not
require
catalysts,
their
mechanical
strength
and
chemical
stability
remain
a
major
concern.
In
this
study,
recyclable
poly(aryl
imine)
(PAI)
with
high
excellent
resistance
are
fabricated
by
copolymerizing
aromatic
amines
aldehydes
through
imine
bonds.
The
resulting
PAI
plastic
tensile
58.2
MPa
exhibits
in
acidic
basic
aqueous
solutions
various
organic
solvents.
can
be
depolymerized
mixed
solvent
tetrahydrofuran
(THF)/HCl
solution
the
dissociation
bonds,
monomers
facilely
recovered
purity
isolated
yields
due
to
solubility
difference
between
selective
efficient
also
realized
monomer
conversion
because
hydrolysis
generates
amines.
used
re-fabricate
original
plastics.
This
selectively
from
complicated
polymer
waste
streams
mild
depolymerization
conditions
its
most
Journal of the American Chemical Society,
Journal Year:
2023,
Volume and Issue:
145(38), P. 20927 - 20935
Published: Sept. 15, 2023
Thermosetting
polymers
possess
excellent
environmental
resistance
and
mechanical
properties
but
cannot
be
reprocessed
due
to
their
covalently
cross-linked
structures.
Recycling
of
thermosets
via
the
implantation
dynamic
covalent
bonds
offers
a
promising
solution.
Here,
we
report
direct
catalyst-free
ester
metathesis
N-acyloxyphthalimide
(NAPI)
at
about
100
°C
without
requirement
hydroxyl
groups
its
utilization
for
fabrication
adaptable
networks
(CANs).
NAPI
has
interesting
sigmoid
kinetics
with
fast
exchange
rate,
which
proceeds
free
radical
chain
mechanism,
guaranteeing
associative
under
rather
low
dissociation.
The
bifunctional
molecule
as
both
precursor
substrate
is
key
dissociatively
initiated
(DAssociative)
mechanism
kinetic
behavior.
Based
on
efficient
metathesis,
polyester
networks,
poly(N-acyloxyphthalimides)
(PNAPIs),
show
malleability.
Notably,
PNAPIs
exhibit
exceptional
solvent
stability
elevated
temperatures
owing
unique
DAssociative
suggesting
exciting
opportunities
designing
recyclable
thermosetting
polymers.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(34)
Published: April 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.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(31)
Published: May 20, 2024
Dithioacetals
are
heavily
used
in
organic,
material
and
medical
chemistries,
exhibit
huge
potential
to
synthesize
degradable
or
recyclable
polymers.
However,
the
current
synthetic
approaches
of
dithioacetals
polydithioacetals
overwhelmingly
dependent
on
external
catalysts
organic
solvents.
Herein,
we
disclose
a
catalyst-
solvent-free
acetal-thiol
click-like
reaction
for
synthesizing
polydithioacetals.
High
conversion,
higher
than
acid
catalytic
reaction,
can
be
achieved.
universality
was
confirmed
by
monitoring
reactions
linear
cyclic
acetals
(including
renewable
bio-sourced
furan-acetal)
with
aliphatic
aromatic
thiols,
mechanism
monomolecular
nucleophilic
substitution
(S
