Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(28), P. 19449 - 19459
Published: July 2, 2024
Mechanical
recycling
is
one
of
the
simplest
and
most
economical
strategies
to
address
ever-increasing
plastic
pollution,
but
it
cannot
be
applied
immiscible
mixed
plastics
suffers
from
property
deterioration
after
each
cycle.
By
combining
amphiphilic
block
copolymer
strategy
reactive
compatibilization
strategy,
we
designed
a
series
stapler
for
compatibilizing/upcycling
plastics.
First,
various
functionalized
graft
copolymers
were
accessed
via
different
synthetic
routes.
Subsequently,
addition
very
small
amount
molecules
induced
synergistic
effect
with
that
improved
compatibility
mechanical
properties
These
highly
effective
binary/ternary
systems
can
directly
postconsumer
waste
plastics,
which
increase
toughness
by
162
times.
Most
importantly,
also
effectively
impact
resistance,
adhesion
performance,
three-dimensional
(3D)
printing
performance
permitted
blends
20
times
minimal
degradation
in
their
properties.
Science,
Journal Year:
2023,
Volume and Issue:
381(6658), P. 666 - 671
Published: Aug. 10, 2023
Conversion
of
plastic
wastes
to
fatty
acids
is
an
attractive
means
supplement
the
sourcing
these
high-value,
high-volume
chemicals.
We
report
a
method
for
transforming
polyethylene
(PE)
and
polypropylene
(PP)
at
~80%
conversion
with
number-average
molar
masses
up
~700
670
daltons,
respectively.
The
process
applicable
municipal
PE
PP
their
mixtures.
Temperature-gradient
thermolysis
key
controllably
degrading
into
waxes
inhibiting
production
small
molecules.
are
upcycled
by
oxidation
over
manganese
stearate
subsequent
processing.
ꞵ-scission
produces
more
olefin
wax
yields
higher
acid-number
than
does
ꞵ-scission.
further
convert
large-market-volume
surfactants.
Industrial-scale
technoeconomic
analysis
suggests
economic
viability
without
need
subsidies.
Chemical Reviews,
Journal Year:
2024,
Volume and Issue:
124(5), P. 2327 - 2351
Published: Feb. 26, 2024
Polyethylene
deconstruction
to
reusable
smaller
molecules
is
hindered
by
the
chemical
inertness
of
its
hydrocarbon
chains.
Pyrolysis
and
related
approaches
commonly
require
high
temperatures,
are
energy-intensive,
yield
mixtures
multiple
classes
compounds.
Selective
cleavage
reactions
under
mild
conditions
(
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: March 20, 2024
Abstract
Only
a
small
proportion
of
global
plastic
waste
is
recycled,
which
most
mechanically
recycled
into
lower
quality
materials.
The
alternative,
chemical
recycling,
enables
renewed
production
pristine
materials,
but
generally
comes
at
high
energy
cost,
particularly
for
processes
like
pyrolysis.
This
review
focuses
on
light-driven
approaches
chemically
recycling
and
upcycling
waste,
with
emphasis
reduced
consumption
selective
transformations
not
achievable
heat-driven
methods.
We
focus
challenging
to
recycle
backbone
structures
composed
mainly
C‒C
bonds,
lack
functional
groups
i.e.,
esters
or
amides,
that
facilitate
e.g.,
by
solvolysis.
discuss
the
use
light,
either
in
conjunction
heat
drive
depolymerization
monomers
via
photocatalysis
transform
polymers
valuable
molecules.
structural
prerequisites
these
are
outlined,
highlighting
their
advantages
as
well
limitations.
conclude
an
outlook,
addressing
key
challenges,
opportunities,
provide
guidelines
future
photocatalyst
(PC)
development.
Macromolecules,
Journal Year:
2024,
Volume and Issue:
57(5), P. 1919 - 1940
Published: Feb. 22, 2024
The
large
production
and
indiscriminate
disposal
of
plastics
have
resulted
in
serious
resource
global
environmental
crises,
which
has
raised
a
demand
to
develop
more
sustainable
circular
economy.
An
ideal
strategy
address
the
end-of-life
issue
is
next-generation
polymers
with
closed-loop
life
cycles,
can
be
selectively
depolymerized
back
monomers
at
end
their
service
life.
Aliphatic
polyesters
prepared
by
ring-opening
polymerization
(ROP)
moderately
strained
lactones
shown
great
potential
recyclable
polymers.
This
Perspective
highlights
recent
achievements
for
that
are
derived
from
four-,
five-,
six-,
seven-membered
focusing
on
discussion
thermodynamic
kinetic
considerations,
monomer
design
principles
polymer
preparations,
material
properties,
chemical
recyclability.
Finally,
current
challenges
possible
directions
also
discussed.
Green Carbon,
Journal Year:
2024,
Volume and Issue:
2(1), P. 1 - 11
Published: Feb. 2, 2024
Plastics
are
integral
to
numerous
significant
social
advancements.
Nonetheless,
their
contribution
environmental
pollution
and
climate
crises
cannot
be
disregarded,
as
negative
impact
on
the
environment
increases
with
incremental
production
capacity
demand.
Concerted
global
action
is
urgently
required
promote
green
recycle
of
plastics
prevent
accumulation
in
mitigate
carbon
emissions.
This
review
aims
reveal
paths
development
for
polyester
plastics,
incorporating
trends
revolution
mature
commercial
newly
emerging
biodegradable
future
plastics.
A
critical
discussion
was
conducted
current
potential
research
areas
from
multiple
perspectives,
including
raw
materials,
processes,
recycling,
propel
us
into
a
marked
by
sustainability.
Chemical Reviews,
Journal Year:
2024,
Volume and Issue:
124(16), P. 9457 - 9579
Published: Aug. 16, 2024
The
large
production
volumes
of
commodity
polyolefins
(specifically,
polyethylene,
polypropylene,
polystyrene,
and
poly(vinyl
chloride)),
in
conjunction
with
their
low
unit
values
multitude
short-term
uses,
have
resulted
a
significant
pressing
waste
management
challenge.
Only
small
fraction
these
is
currently
mechanically
recycled,
the
rest
being
incinerated,
accumulating
landfills,
or
leaking
into
natural
environment.
Since
are
energy-rich
materials,
there
considerable
interest
recouping
some
chemical
value
while
simultaneously
motivating
more
responsible
end-of-life
management.
An
emerging
strategy
catalytic
depolymerization,
which
portion
C-C
bonds
polyolefin
backbone
broken
assistance
catalyst
and,
cases,
additional
molecule
reagents.
When
products
molecules
materials
higher
own
right,
as
feedstocks,
process
called
upcycling.
This
review
summarizes
recent
progress
for
four
major
upcycling
strategies:
hydrogenolysis,
(hydro)cracking,
tandem
processes
involving
metathesis,
selective
oxidation.
Key
considerations
include
macromolecular
reaction
mechanisms
relative
to
mechanisms,
design
transformations,
effect
conditions
on
product
selectivity.
Metrics
describing
critically
evaluated,
an
outlook
future
advances
described.
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(3), P. 1676 - 1691
Published: Jan. 22, 2024
Mechanical
recycling
of
plastic
waste
is
not
sustainable
and
inefficient
in
terms
the
resources
needed
to
accomplish
process,
quality
materials
obtained
from
this
technique
substandard.
Chemical
polymers
appears
be
preferable
because
technology
allows
for
production
new
materials.
This
review
compiles
most
recent
research
which
selected
transition
metals
are
used
as
catalysts
hydrogenolytic
depolymerization
polyolefins
a
polymer
upcycling
process.
Hydrogenolysis
an
emerging
chemical
method
that
uses
transition-metal
complexes
presence
hydrogen
cleave
C–C
bonds
substances
into
shorter
hydrocarbons.
Transition
such
Ruthenium
(Ru),
Platinum
(Pt),
Nickel
(Ni),
Cobalt
(Co),
Zirconium
(Zr),
Tantalum
(Ta),
Rhodium
(Rh)
have
been
utilized
recently
type
reaction.
hydrogenolysis
can
produce
valuable
hydrocarbon
products,
gas/liquid
fuels
lubricating
oils,
under
relatively
milder
operational
conditions
with
less
environmental
impact.
The
focused
on
supported
metal
organometal
catalytic
system
their
mechanism
polyolefin
pathways
detailed
investigation
impact
reaction
parameters
high
gasoline,
diesel,
light
lubricants.
