Modular access to aliphatic polycarbonates with tunable properties and dual closed‐loop recyclability by polycondensation−depolymerization−repolymerization strategy
Angewandte Chemie,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 28, 2025
Abstract
Great
achievements
have
been
made
in
CO
2
/epoxide
copolymerization
and
dialkyl
carbonate/diol
polycondensation;
however,
efficient
preparation
of
high‐molecular‐weight
(>100
kDa)
aliphatic
polycarbonates
with
tunable
properties
recyclability
under
mild
conditions
still
remains
as
a
great
challenge.
Herein,
we
presented
“polycondensation–depolymerization–repolymerization”
strategy
for
structurally
diverse
polycarbonates.
This
involved
step
growth
polycondensation
carbonate
diol
to
low‐molecular‐weight
(0.5−1.9
atmosphere
pressure,
which
are
then
utilized
produce
cyclic
monomers
through
catalytic
depolymerization.
The
ring‐opening
polymerization
led
high
molecular
weight
polymers,
can
be
converted
back
monomer
via
ring‐closing
depolymerization
or
diol/dialkyl
alcoholysis,
enabling
chemical
recycling
dual
closed
loops.
thermal
mechanical
the
widely
adjusted
by
varying
substituent,
polycarbonate
four‐membered
spiro‐cyclic
substituent
shows
recorded
melting
temperature
(217
°C)
strength
within
reported
family.
A(hard)‐B(soft)‐A(hard)
triblock
thermoplastic
elastomers
good
performance
elastic
recovery
were
also
created
sequential
polymerization.
“polycondensation−depolymerization−repolymerization”
provided
powerful
toolbox
developing
high‐performance
Язык: Английский
Modular access to aliphatic polycarbonates with tunable properties and dual closed‐loop recyclability by polycondensation−depolymerization−repolymerization strategy
Angewandte Chemie International Edition,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 28, 2025
Abstract
Great
achievements
have
been
made
in
CO
2
/epoxide
copolymerization
and
dialkyl
carbonate/diol
polycondensation;
however,
efficient
preparation
of
high‐molecular‐weight
(>100
kDa)
aliphatic
polycarbonates
with
tunable
properties
recyclability
under
mild
conditions
still
remains
as
a
great
challenge.
Herein,
we
presented
“polycondensation–depolymerization–repolymerization”
strategy
for
structurally
diverse
polycarbonates.
This
involved
step
growth
polycondensation
carbonate
diol
to
low‐molecular‐weight
(0.5−1.9
atmosphere
pressure,
which
are
then
utilized
produce
cyclic
monomers
through
catalytic
depolymerization.
The
ring‐opening
polymerization
led
high
molecular
weight
polymers,
can
be
converted
back
monomer
via
ring‐closing
depolymerization
or
diol/dialkyl
alcoholysis,
enabling
chemical
recycling
dual
closed
loops.
thermal
mechanical
the
widely
adjusted
by
varying
substituent,
polycarbonate
four‐membered
spiro‐cyclic
substituent
shows
recorded
melting
temperature
(217
°C)
strength
within
reported
family.
A(hard)‐B(soft)‐A(hard)
triblock
thermoplastic
elastomers
good
performance
elastic
recovery
were
also
created
sequential
polymerization.
“polycondensation−depolymerization−repolymerization”
provided
powerful
toolbox
developing
high‐performance
Язык: Английский
NaOH-Catalyzed Alcoholysis of Polylactide
ACS Sustainable Chemistry & Engineering,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 30, 2025
Язык: Английский
Electrospun Graphene Oxide/Poly(m-phenylene isophthalamide) Composite Nanofiber Membranes for High Performance
Membranes,
Год журнала:
2025,
Номер
15(5), С. 145 - 145
Опубликована: Май 12, 2025
Due
to
its
distinctive
two-dimensional
structure
and
high
specific
surface
area,
graphene
oxide
(GO)
is
expected
be
a
very
promising
material
used
for
membrane
separation.
Not
only
can
it
improve
the
mechanical
strength,
wettability,
thermal
stability
of
membrane,
but
also
filtration
performance
shelf
life
polymer
membrane.
Graphene
oxide/poly(meta-phenylene
isophthalamide)
(GO/PMIA)
nanofiber
membranes
were
prepared
by
means
an
electrospinning
technique.
The
effects
adding
different
amounts
GO
on
PMIA
studied.
results
indicated
that
had
strong
affinity
with
matrix
forming
hydrogen
bonds.
composite
exhibited
better
thermostability
than
those
pristine
As
loading
amount
was
1.0
wt%,
air
efficiency
97.79%,
pressure
drop
85.45
Pa
glass
transition
temperature
299.8
°C.
Язык: Английский
Biobased Polyamides: Monomer Sources, Preparation, Functional Modifications, and Applications
Macromolecular Rapid Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 25, 2025
Abstract
With
the
continued
consumption
of
non‐renewable
petroleum
resources
and
ever‐seriously
climate
change
problems,
reducing
use
fossil
diminishing
carbon
emissions
have
become
significant
development
directions
for
establishing
a
carbon‐neutral
chemical
industry.
Biobased
polyamides
(BPAs)
emerged
as
crucial
bio‐renewable
polymer
materials
with
great
potentials
owing
to
their
extensive
monomer
sources,
multiple
varieties,
excellent
physical‐mechanical
properties,
good
thermal
stability,
easy
processability,
etc.
Besides,
diverse
synthetic
methods
functionalized
modification
strategies
further
broadened
working
scenarios
BPAs,
demonstrating
outstanding
application
possibilities
not
only
in
traditional
industrial
fields,
but
also
some
emerging
fields.
Over
last
few
decades,
increasing
numbers
BPAs
are
successfully
developed,
striking
advancements
achieved
this
research
field.
Unfortunately,
there
is
yet
review
systematically
summarize
progress.
The
present
paper
summarizes
major
dealing
during
past
which
preparation,
functional
modifications,
applications
introduced
detail.
Moreover,
challenges
opportunities
future
concerning
presented.
This
may
motivate
more
interest
facilitating
comprehensive
large‐scale
applications.
Язык: Английский