Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 4, 2024
Abstract
The
recycling
and
upcycling
of
polyethylene
terephthalate
(PET),
the
most
widely
used
polyester
plastic
globally,
has
attracted
growing
attention
concerning
its
disposal
as
non‐degradable
waste
in
natural
environment.
Transforming
end‐of‐life
PET
into
(bio)degradable
offers
a
novel
approach
to
managing
waste.
In
this
study,
we
introduce
simple
process
capable
converting
degradable
polyester,
terephthalate‐polyethylene‐1,4‐cyclohexanedicarboxylate
(PET‐PECHD),
by
partly
hydrogenating
aromatic
rings
(
x
)
aliphatic
ones
y
).
polyesters
with
variable
/
compositions
ranging
from
100/0
0/100
can
be
achieved,
molecular
weight
(Mw)
maintained
when
>87/13
due
nonobvious
depolymerization.
Pronounced
depolymerization
would
occur
deeper
hydrogenation,
which
generates
blend
PET‐PECHD
polyethylene‐1,4‐cyclohexanedicarboxylate
(PECHD)
lower
Mw,
finally
single‐type
polymer
PECHD.
demonstrates
comparable
thermal
stability
mechanical
strength
compared
PET,
along
superior
extensibility,
barrier
properties,
(bio)degradability
acidic,
alkaline
solutions,
moist
soil.
This
research
highlights
potential
for
cost‐effective,
large‐scale
production
real‐life
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(33)
Published: June 13, 2024
Abstract
Plastics,
renowned
for
their
outstanding
properties
and
extensive
applications,
assume
an
indispensable
irreplaceable
role
in
modern
society.
However,
the
ubiquitous
consumption
of
plastic
items
has
led
to
a
growing
accumulation
waste.
Unreasonable
practices
production,
utilization,
recycling
plastics
have
substantial
energy
resource
depletion
environmental
pollution.
Herein,
state‐of‐the‐art
advancements
lifecycle
management
are
timely
reviewed.
Unlike
typical
reviews
focused
on
recycling,
this
work
presents
in‐depth
analysis
entire
plastics,
covering
whole
process
from
synthesis,
processing,
ultimate
disposal.
The
primary
emphasis
lies
selecting
judicious
strategies
methodologies
at
each
stage
mitigate
adverse
impact
waste
plastics.
Specifically,
article
delineates
rationale,
methods,
realized
various
stages
through
both
physical
chemical
pathways.
focal
point
is
attainment
optimal
rates
thereby
alleviating
ecological
burden
By
scrutinizing
aims
furnish
comprehensive
solutions
reducing
pollution
fostering
sustainability
across
all
facets
ChemSusChem,
Journal Year:
2024,
Volume and Issue:
17(13)
Published: Feb. 27, 2024
Abstract
Poly(ethylene
terephthalate)
(PET),
extensively
employed
in
bottles,
film,
and
fiber
manufacture,
has
generated
persistent
environmental
contamination
due
to
its
non‐degradable
nature.
The
resolution
of
this
issue
requires
the
conversion
waste
PET
into
valuable
products,
often
achieved
through
depolymerization
monomers.
However,
laborious
purification
procedures
involved
extraction
monomers
pose
challenges
constraints
on
complete
utilization
PET.
Herein,
a
strategy
is
demonstrated
for
polymer‐to‐polymer
upcycling
high‐value
biodegradable
programmable
materials
named
PEXT.
This
process
involves
reversible
transesterifications
dependent
ester
bonds,
wherein
commercially
available
X‐monomers
from
aliphatic
diacids
diols
are
introduced,
utilizing
existing
industrial
equipment
utilization.
PEXT
features
molecular
structure,
delivering
tailored
mechanical,
thermal,
biodegradation
performance.
Notably,
exhibits
superior
mechanical
performance,
with
maximal
elongation
at
break
3419.2
%
toughness
270.79
MJ
m
−3
.
These
characteristics
make
suitable
numerous
applications,
including
shape‐memory
materials,
transparent
films,
fracture‐resistant
stretchable
components.
Significantly,
allows
closed‐loop
recycling
within
specific
analogs
by
reprograming
or
X‐monomers.
not
only
offers
cost‐effective
advantages
large‐scale
advanced
but
also
demonstrates
enormous
prospect
conservation.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(46)
Published: Aug. 4, 2024
Poly(ethylene
terephthalate)
(PET)
is
an
important
polymer
with
annual
output
second
only
to
polyethylene.
Due
its
low
biodegradability,
a
large
amount
of
PET
recycled
for
sustainable
development.
However,
current
strategies
recycling
are
limited
by
added
value
or
small
product
scale.
It
urgent
make
breakthrough
on
the
principle
macromolecular
reaction
and
efficiently
prepare
products
high
wide
applications.
Here,
catalyst-
solvent-free
synthesis
biodegradable
plastics
reported
through
novel
carboxyl-ester
transesterification
between
waste
bio-based
hydrogenated
dimer
acid
(HDA),
which
can
directly
substitute
some
terephthalic
(TPA)
units
in
chain
HDA
unit.
This
be
facilely
carried
out
equipment
polyester
industry
without
any
additional
catalyst
solvent,
thus
enabling
low-cost
large-scale
production.
Furthermore,
semi-bio-based
copolyester
shows
excellent
mechanical
properties,
regulable
flexibility
good
expected
poly(butylene
adipate-co-terephthalate)
(PBAT)
plastic
as
value-added
materials.
work
provides
environmental-friendly
economic
strategy
upcycling
waste.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 2, 2025
The
selective
recycling
of
mixed
plastic
wastes
with
similar
structural
units
is
challenging.
While
heterogeneous
catalysis
shows
potential
for
recycling,
challenges
such
as
complex
mass
transfer
at
multiphase
interfaces
and
unclear
catalytic
mechanisms
have
slowed
progress.
In
this
study,
a
breakthrough
in
polyester
introduced
using
photothermal
catalysis.
By
adding
co-solvents,
the
difficulties
associated
interfacial
are
overcome.
Grain
boundary
(GB)-rich
CeO
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(34)
Published: March 30, 2024
Abstract
The
development
of
multifunctional
bio‐based
materials
with
closed‐loop
chemically
recyclable
plastics
can
be
a
paramount
response
to
the
worldwide
plastic
waste
predicament.
However,
trade‐off
dilemma
between
high
performance
and
easy
recycling
these
still
encounters
huge
challenges.
In
this
contribution,
inspired
by
significant
contribution
hydrogen
bonding
networks
enhanced
mechanical
gas
barrier
as
well
cosolvents
enhance
performance,
novel
polyester
material
(PBH
y
F)
synthesized
monomers
that
integrate
high‐performance
efficient
chemical
is
presented.
PBH
F
show
ultra‐high
properties
(83.2
MPa,
233.9%)
(CO
2
0.0157
barrer,
O
0.0071
H
5.518E‐15
g·cm/cm
·s·Pa)
are
greater
than
most
engineering
previous
work.
More
significantly,
also
exhibits
multifunctionality
excellent
ultraviolet
shielding
properties,
solvent‐resistant
performance.
initial
obtained
in
exceptional
yields
(>90.0%)
purity
(>99.0%)
under
mild
conditions
simple
energy‐efficient
rapid
chemical‐solvolysis
strategy,
even
polyolefin
blend
plastics.
Further
possesses
similar
repolymerized
comparable
before
recycling.
Hence,
state‐of‐art
easy‐recycling
provide
new
approach
for
green,
sustainable
economy.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(52)
Published: Nov. 8, 2023
A
novel
in
situ
chemical
upcycling
strategy
for
plastic
waste
is
proposed
by
the
customized
diphenylacetylene
monomer
with
dual
photo-response.
That
is,
reactive
monomers
are
inserted
into
macromolecular
chain
of
polyethylene
terephthalate
(PET)
plastics/fibers
through
one-pot
transesterification
slight-depolymerization
and
re-polymerization.
On
one
hand,
group
absorbs
short-wave
high-energy
UV
rays
then
releases
long-wave
low-energy
harmless
fluorescence.
other
UV-induced
photo-crosslinking
reaction
among
groups
produces
extended
π-conjugated
structure,
resulting
a
red-shift
(due
to
decreased
HOMO-LUMO
separation)
absorption
band
locked
crosslink
points
between
PET
chains.
Therefore,
increasing
exposure
time,
upcycled
plastics
exhibit
reverse
enhanced
resistance
mechanical
strength
(superior
original
performance),
instead
serious
UV-photodegradation
damaged
performance.
This
at
oligomer-scale
not
only
provides
new
idea
traditional
recycling,
but
also
solves
common
problem
gradual
degradation
polymer
performance
during
use.
