Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 17, 2024
Abstract
The
pursuit
of
sustainable
practices
through
the
chemical
recycling
polyamide
wastes
holds
significant
potential,
particularly
in
enabling
recovery
a
range
nitrogen‐containing
compounds.
Herein,
we
report
novel
strategy
to
upcycle
tertiary
amines
with
assistance
H
2
acetic
acid
under
mild
conditions
(e.g.,
180
°C),
which
is
achieved
over
anatase
TiO
supported
Mo
single
atoms
and
Rh
nanoparticles.
In
this
protocol,
first
converted
into
diacetamide
intermediates
via
acidolysis,
are
subsequently
hydrogenated
corresponding
carboxylic
monomers
100
%
selectivity.
It
verified
that
nanoparticles
work
together
activate
both
amide
bonds
intermediate,
synergistically
catalyze
its
hydrodeoxygenation
form
amine,
but
catalyst
ineffective
for
hydrogenation
acid.
This
presents
an
effective
way
reconstruct
various
acids,
may
have
promising
application
potential.
Green Chemistry,
Год журнала:
2023,
Номер
25(18), С. 6949 - 6970
Опубликована: Янв. 1, 2023
This
review
summarizes
the
emerging
advanced
technologies
including
bio-,
photo-,
electro-,
and
low-temperature
thermocatalysis
for
recycling
upgrading
of
waste
plastics
under
mild
conditions.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Янв. 2, 2024
Abstract
Chemical
recycling
of
plastic
wastes
is
great
significance
for
sustainable
development,
which
also
represents
a
largely
untapped
opportunity
the
synthesis
value-added
chemicals.
Herein,
we
report
novel
and
general
strategy
to
degrade
polyesters
via
directly
breaking
C
alkoxy
-O
bond
by
nucleophilic
substitution
halide
anion
ionic
liquids
under
mild
conditions.
Combined
with
hydrogenation
over
Pd/C,
1-butyl-2,3-dimethylimidazolium
bromide
can
realize
deconstruction
various
including
aromatic
aliphatic
ones,
copolyesters
polyester
mixtures
into
corresponding
carboxylic
acids
alkanes;
meanwhile,
tetrabutylphosphonium
achieve
direct
decomposition
β
-H
alkenes
hydrogen-
metal-free
It
found
that
hydrogen-bonding
interaction
between
liquid
ester
group
in
enhances
nucleophilicity
activates
bond.
The
findings
demonstrate
how
be
viable
feedstock
production
hydrocarbons.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Янв. 24, 2024
Abstract
The
chemical
transformation
of
waste
polymers
into
value-added
chemicals
is
significance
for
circular
economy
and
sustainable
development.
Herein,
we
report
upcycling
poly(succinates)
(PSS)
with
amines
N-substituted
succinimides
over
succinimide
anion-based
ionic
liquids
(ILs,
e.g,
1,8-diazabicyclo[5.4.0]undec-7-ene
succinimide,
[HDBU][Suc]).
Assisted
H
2
O,
[HDBU][Suc])
showed
the
best
performance,
which
could
achieve
complete
a
series
PSS
derivatives
corresponding
diols
under
mild
metal-free
conditions.
Mechanism
investigation
indicates
that
cation-anion
confined
hydrogen-bonding
interactions
among
IL,
ester
group,
amino/amide
groups,
strengthens
nucleophilicity
N
atoms
in
improves
electrophilicity
carbonyl
C
atom
group.
attack
on
group
results
cleavage
C-O
bond
polyester
formation
amide
This
strategy
also
effective
aminolysis
poly(trimethylene
glutarate)
to
glutarimides,
poly(1,4-butylene
adipate)
caprolactone
diimides.
ACS Macro Letters,
Год журнала:
2024,
Номер
unknown, С. 151 - 157
Опубликована: Янв. 16, 2024
Polymeric
materials
are
indispensable
in
our
daily
lives.
However,
the
generation
of
vast
amounts
waste
polymers
poses
significant
environmental
and
ecological
challenges.
Instead
resorting
to
landfilling
or
incineration,
strategies
for
polymer
recycling
offer
a
promising
approach
mitigate
pollution.
Pioneering
studies
have
demonstrated
alcoholysis
polyesters
polycarbonates;
however,
these
processes
typically
require
use
catalysts.
Moreover,
development
catalyst
removal
is
crucial,
particularly
some
industrial
applications.
In
contrast,
we
present
catalyst-free
method
common
polyester
polycarbonate
into
small
organic
molecules.
Certain
polar
solvents
exhibit
remarkable
efficiency
degradation
under
conditions.
Employing
solvents,
both
resins
commercially
available
products
could
be
effectively
degraded
via
alcoholysis.
Our
design
contributes
straightforward
route
polymeric
materials.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 17, 2024
The
pursuit
of
sustainable
practices
through
the
chemical
recycling
polyamide
wastes
holds
significant
potential,
particularly
in
enabling
recovery
a
range
nitrogen-containing
compounds.
Herein,
we
report
novel
strategy
to
upcycle
tertiary
amines
with
assistance
H
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Март 12, 2025
Commodity
polymers
are
ubiquitous
in
our
society,
having
replaced
many
inorganic
and
metal-based
materials
due
to
their
versatile
properties.
However,
functionality
heavily
relies
on
the
addition
of
various
components
known
as
additives,
making
it
challenging
recycle
polymer
fraction
plastic
effectively.
Thus,
is
crucial
develop
efficient
chemical
recovery
strategies
for
commodity
additives
facilitate
direct
utilization
recovered
monomers
without
additional
purification.
Here,
we
a
strategy
co-upcycling
two
types
waste
polymers,
polycarbonate,
polyethylene
terephthalate
into
polyarylate,
high-performance
transparent
engineering
plastic.
By
incorporating
highly
active
metal-free
ionic
liquids
catalyst
methanolysis
two-stage
interface
polymerization
technique
with
variable
temperature
control,
successfully
prepare
polyacrylate
film
from
real
end-of-life
plastics
capping
agent
impurities
monomers.
These
exhibit
excellent
thermal
performance
(Tg
=
192.8
°C),
transmittance
(reach
up
86.73%),
flame-retardant
properties
(V-0,
UL-94),
equivalent
those
commercial
polyarylate
(U-100,
about
$10000/ton),
could
be
further
easily
close-loop
recycled.
Demonstrated
kilogram-scale
experiments
life
cycle
assessments,
this
approach
offers
low-carbon,
environmentally
friendly,
economically
feasible
pathway
upcycling
polymers.
Recycling
remains
presence
mixed
streams.
Here
authors
terephthalate,
