Ultrafast Thermal RAFT Depolymerization at Higher Solid Contents
ACS Macro Letters,
Год журнала:
2025,
Номер
unknown, С. 235 - 240
Опубликована: Фев. 10, 2025
Although
thermal
solution
RAFT
depolymerization
has
recently
emerged
as
an
efficient
chemical
recycling
methodology,
current
approaches
require
specialized
solvents
(i.e.,
dioxane),
typically
suffer
from
extended
reaction
times,
and
operate
exclusively
under
highly
dilute
conditions
5
mM
repeat
unit
concentration).
To
circumvent
these
limitations,
a
commercial
radical
initiator
is
introduced
to
kinetically
untrap
the
promote
chain-end
activation.
By
varying
concentration,
remarkable
rate
acceleration
(up
72
times
faster)
can
be
observed,
enabling
completion
of
within
min.
Notably,
20-fold
increase
in
concentration
did
not
appreciably
compromise
final
yield,
while
very
high
percentages
monomer
could
recovered
wide
range
solvents,
including
dimethyl
sulfoxide,
anisole,
xylene,
acetonitrile,
toluene,
trichlorobenzene.
Our
findings
only
offer
intriguing
mechanistic
aspects,
but
also
significantly
expand
scope
applications
depolymerization.
Язык: Английский
Harnessing Non-Thermal External Stimuli for Polymer Recycling
Macromolecules,
Год журнала:
2025,
Номер
58(5), С. 2210 - 2223
Опубликована: Фев. 18, 2025
Polymeric
materials
have
become
indispensable
due
to
their
versatility
and
low
cost,
yet
environmental
impact
presents
a
significant
global
challenge.
Traditional
chemical
recycling
methods
typically
rely
on
heat
as
stimulus;
for
instance,
pyrolysis
is
popular
methodology
which
faces
limitations
high
energy
consumption,
product
selectivity,
the
generation
of
undesirable
byproducts.
In
response,
recent
advances
in
promotion
depolymerization
degradation
through
alternative
stimuli
such
light,
electrochemistry,
mechanical
force,
shown
promising
potential
more
efficient
selective
polymer
breakdown,
yielding
either
starting
monomers
or
valuable
small
molecules.
This
perspective
explores
key
examples
these
emerging
strategies,
highlighting
improve
upon
current
protocols
offer
pathways
under
milder
conditions,
while
identifying
challenges
that
future
research
must
address
translate
chemistry
into
viable
broadly
applicable
strategies.
Язык: Английский
Capping agent control over the physicochemical and antibacterial properties of ZnO nanoparticles
Applied Surface Science,
Год журнала:
2025,
Номер
unknown, С. 162739 - 162739
Опубликована: Фев. 1, 2025
Язык: Английский
Oxygen‐Tolerant ATRP Depolymerization Enabled by an External Radical Source
Macromolecular Rapid Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 22, 2025
Abstract
Although
the
chemical
recycling
of
polymers
synthesized
by
controlled
radical
polymerization
enables
recovery
pristine
monomer
at
low
temperatures,
it
operates
efficiently
under
strictly
anaerobic
conditions.
Instead,
oxygen‐tolerant
depolymerizations
are
scarce,
and
either
restricted
to
use
a
boiling
co‐solvent
or
performed
in
closed
vessels,
often
suffering
from
conversions.
Here,
an
open‐vessel,
depolymerization
atom
transfer
(ATRP)‐synthesized
is
introduced,
leading
high
percentages
regeneration
(>90%
efficiency).
Dissolved
oxygen
eliminated
utilizing
catalyst
loadings,
lower
loadings
combined
with
initiator.
Notably,
methodology
compatible
various
solvents
(i.e.,
anisole,
1,2,4‐trichlorobenzene
(TCB),
1,2‐dichlorobenzene
(DCB),
etc.)
range
commercially
available
ligands
including
tris
2‐(dimethylamino)ethylamine
(Me
6
TREN)
tris(2‐pyridylmethyl)amine
(TPMA),
as
well
more
inexpensive
alternatives
such
tris(2‐aminoethyl)amine
(TREN)
N,N,N‘,N‘‘,N‘‘
‐pentamethyldiethylenetriamine
(PMDETA).
Язык: Английский