Visible light–triggered depolymerization of commercial polymethacrylates
Science,
Год журнала:
2025,
Номер
387(6736), С. 874 - 880
Опубликована: Фев. 20, 2025
The
reversion
of
vinyl
polymers
with
carbon-carbon
backbones
to
their
monomers
represents
an
ideal
path
alleviate
the
growing
plastic
waste
stream.
However,
depolymerizing
such
stable
materials
remains
a
challenge,
state-of-the-art
methods
relying
on
"designer"
that
are
neither
commercially
produced
nor
suitable
for
real-world
applications.
In
this
work,
we
report
main
chain-initiated,
visible
light-triggered
depolymerization
directly
applicable
commercial
containing
undisclosed
impurities
(e.g.,
comonomers,
additives,
or
dyes).
By
in
situ
generation
chlorine
radicals
from
solvent,
near-quantitative
(>98%)
polymethacrylates
could
be
achieved
regardless
synthetic
route
radical
ionic
polymerization),
end
group,
and
molecular
weight
(up
1.6
million
daltons).
possibility
perform
multigram-scale
depolymerizations
confer
temporal
control
renders
methodology
versatile
general
recycling.
Язык: Английский
Selective Depolymerization for Sculpting Polymethacrylate Molecular Weight Distributions
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 29, 2025
Chain-end
reactivation
of
polymethacrylates
generated
by
reversible-deactivation
radical
polymerization
(RDRP)
has
emerged
as
a
powerful
tool
for
triggering
depolymerization
at
significantly
milder
temperatures
than
those
traditionally
employed.
In
this
study,
we
demonstrate
how
the
facile
poly(butyl
methacrylate)
(PBMA)
can
be
leveraged
to
selectively
skew
molecular
weight
distribution
(MWD)
and
predictably
alter
viscoelastic
properties
blended
PBMA
mixtures.
By
mixing
polymers
with
thermally
active
chain
ends
different
weights
inactive
ends,
MWD
blends
skewed
high
or
low
selective
depolymerization.
This
approach
leads
counterintuitive
principle
"destructive
strengthening"
material.
Finally,
demonstrate,
proof
concept,
encryption
information
within
polymer
mixtures
linking
Morse
code
MWDs
before
after
depolymerization,
allowing
encoding
data
synthetic
macromolecules.
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
Backbone Degradable Polymers via Chain-growth Radical Polymerization
Chinese Journal of Polymer Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 24, 2025
Язык: Английский
Ultra-high molecular weight polymer synthesis via aqueous dispersion polymerization
Chemical Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Polymerization-induced
self-assembly
(PISA)
is
leveraged
for
the
synthesis
of
ultra-high
molecular
weight
polymers
in
concentrated
but
free-flowing
dispersions.
Язык: Английский
Functional Group Transformation Approach to Chemically Recyclable Polymers from Ultra-Low to Moderate Strain Monomers
Macromolecules,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 11, 2025
Язык: Английский
Bulk Depolymerization of Polystyrene with Comonomer Radical Triggers
ACS Macro Letters,
Год журнала:
2025,
Номер
unknown, С. 576 - 581
Опубликована: Апрель 23, 2025
This
study
introduces
a
novel
approach
to
depolymerize
polystyrene
in
the
absence
of
solvent
at
significantly
reduced
temperatures
through
incorporation
thermally
labile
comonomer.
Specifically,
we
employ
N-(methacryloxy)phthalimide
(PhthMA)
as
comonomer
with
an
activated
ester
capable
triggered
decarboxylation.
Thermal
treatment
enables
generation
backbone
radicals
that
promote
β-scission
and
subsequent
unzipping.
These
analogs
up
91%
reversion
monomer
under
2
h
lower
than
those
required
for
conventional
polystyrene.
As
compared
depolymerization
by
decarboxylation
ω-chain
end,
this
pendent-group
was
considerably
more
efficient.
The
recovered
styrene
from
bulk
poly(styrene-co-PhthMA)
copolymers
can
undergo
direct
repolymerization,
yielding
new
styrenic
materials.
strategy
extends
across
various
copolymers,
highlighting
its
potential
broadly
applicable
method
initiating
among
vinyl
polymer
classes.
Язык: Английский
In-situ monitoring of polymer mechanochemistry: what can be learned from small molecule systems
Frontiers in Chemistry,
Год журнала:
2024,
Номер
12
Опубликована: Окт. 16, 2024
Using
mechanical
energy
to
drive
chemical
transformations
is
an
exciting
prospect
improve
the
sustainability
of
reactions
and
produce
products
not
achievable
by
more
traditional
methods.
In-situ
monitoring
reaction
pathways
vital
deliver
reproducible
results
required
for
scale
up
realize
potential
mechanochemistry
beyond
chemistry
lab.
This
mini
review
will
discuss
recent
advances
in
in-situ
ball
milling
polymer
mechanochemistry,
highlighting
shared
knowledge
up.
Язык: Английский