Journal of Applied Polymer Science,
Journal Year:
2024,
Volume and Issue:
142(13)
Published: Dec. 27, 2024
ABSTRACT
A
simple
strategy
is
proposed
to
offer
styrene
(St)
copolymer
with
intrinsic
and
catalyst‐free
upcycling
capability
by
incorporating
α
‐methylstyrene
(AMS)
units
into
the
poly(AMS
‐co‐
St)
(PAS).
Compared
polystyrene
(PS),
PAS
more
susceptible
depolymerizing
St
AMS
monomers
higher
yields
at
relatively
lower
temperature.
The
yield
of
liquid
chemicals
PAS‐4
(26.1
mol%
AMS)
up
93
wt%
380°C,
whereas
that
PS
as
control
78
wt%.
reclaimed
contain
58.4
37.7
AMS,
while
81.8
4.1
AMS.
introduction
in
leads
a
reduction
other
than
monomers.
blends
PAMS
do
not
demonstrate
synergistic
effect
regarding
facilitating
depolymerization.
In
addition,
properties
new
PASs
prepared
are
comparable
those
virgin
PASs.
This
work
proves
concept
recycling
efficiency
could
be
boosted
liable
structural
chains
demonstrates
closed‐loop
up‐cycling.
Chemical Society Reviews,
Journal Year:
2024,
Volume and Issue:
53(14), P. 7309 - 7327
Published: Jan. 1, 2024
Oxidative
degradation
is
a
powerful
method
to
degrade
plastics
into
oligomers
and
small
oxidized
products.
While
thermal
energy
has
been
conventionally
employed
as
an
external
stimulus,
recent
advances
in
photochemistry
have
enabled
photocatalytic
oxidative
of
polymers
under
mild
conditions.
This
tutorial
review
presents
overview
degradation,
from
its
earliest
examples
emerging
strategies.
briefly
discusses
the
motivation
development
with
focus
on
underlying
mechanisms.
Then,
we
will
examine
modern
studies
primarily
relevant
catalytic
degradation.
Lastly,
highlight
some
unique
using
unconventional
approaches
for
polymer
such
electrochemistry.
ChemSusChem,
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 17, 2024
Abstract
Polystyrene
is
a
staple
plastic
in
the
packaging
and
insulation
market.
Despite
its
good
recyclability,
willingness
of
PS
recycling
remains
low,
largely
due
to
high
cost
limited
profitability.
This
review
examines
research
progresses,
gaps,
challenges
areas
that
affect
costs,
including
but
not
logistics,
design,
policymaking.
We
critically
evaluate
recent
developments
upcycling
strategies,
we
particularly
focus
on
tandem
hydrogen‐atom
transfer
(HAT)
strategies.
conclude
future
studies
should
only
reaction
chemistry
mechanisms
also
economic
viability
processes.
The
goal
this
stimulate
development
innovative
strategies
with
low
costs
output
values.
hope
technological
momentum
towards
sustainable
circular
economy.
ACS Catalysis,
Journal Year:
2024,
Volume and Issue:
14(16), P. 12437 - 12453
Published: Aug. 5, 2024
Synthetic
polymers
play
an
indispensable
role
in
modern
society,
finding
applications
across
various
sectors
ranging
from
packaging,
textiles,
and
consumer
products
to
construction,
electronics,
industrial
machinery.
Commodity
plastics
are
cheap
produce,
widely
available,
versatile
meet
diverse
application
needs.
As
a
result,
millions
of
metric
tons
manufactured
annually.
However,
current
approaches
for
the
chemical
recycling
postconsumer
plastic
waste,
primarily
based
on
pyrolysis,
lag
efficiency
compared
their
production
methods.
In
recent
years,
significant
research
has
focused
developing
milder,
economically
viable
methods
commodity
plastics,
which
involves
converting
waste
back
into
monomers
or
transforming
it
other
valuable
chemicals.
This
Perspective
examines
both
cutting-edge
laboratory-scale
contributing
advancements
field
recycling.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2024,
Volume and Issue:
12(26), P. 9978 - 9986
Published: June 18, 2024
Upcycling/recycling
of
waste
polymers
to
reduce
the
exponentially
increasing
plastic
pollution
is
an
environmental
subject
great
importance.
Accordingly,
in
this
work,
we
propose
use
"all-in-one"
photolytic
hydrogen
atom
transfer
(photo-HAT)
reagent
(phenacyl
bromide)
that
can
situ
generate
bromine
radicals,
acetophenone,
HBr,
and
H2O2,
resulting
a
total
four
well-established,
potent
intermediates
for
photodegradation/photodepolymerization
polystyrene
(PS)
foam.
Under
ambient
conditions,
using
ethyl
acetate
solvent
stated
photo-HAT
catalyst,
PS
(Mn
>
120
kg/mol)
breaks
down
oligomers
with
less
than
eight
styrene
units
<
0.76
several
organic
compounds,
such
as
aromatic
ketones,
oxygenated
alkenes
conjunction
acetophenone
trace
benzoic
acid.
A
plausible
reaction
mechanism
demonstrating
role
each
generated
intermediate
involved
photodegradation
proposed.
Herein,
present
efficient
metal-free
photo-oxidative
degradation
method
commercial
cheap
at
sustainable
conditions.
Ultimately,
study
provides
promising
alternative
recent
polymer
valorization
methods
involving
toxic
transition
metal
salts
halogenated
solvents.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(35)
Published: June 19, 2024
Plastic
pollution
is
worsening
the
living
conditions
on
Earth,
primarily
due
to
toxicity
and
stability
of
non-biodegradable
plastics
(NBPs).
Photocatalytic
cracking
NBPs
emerging
as
a
promising
way
cleave
inert
C-C
bonds
abstract
carbon
atoms
from
these
wastes
into
valuable
chemicals
fuels.
However,
controlling
processes
huge
challenge,
ascribed
complicated
reactions
various
NBPs.
Herein,
we
summarize
recent
advances
in
CO
