Angewandte Chemie,
Год журнала:
2023,
Номер
135(25)
Опубликована: Март 29, 2023
Abstract
We
report
an
aqueous
and
near‐infrared
(NIR)
light
mediated
photoinduced
reversible
addition–fragmentation
chain
transfer
(photo‐RAFT)
polymerization
system
catalyzed
by
tetrasulfonated
zinc
phthalocyanine
(ZnPcS
4
−
)
in
the
presence
of
peroxides.
Taking
advantage
its
fast
rates
high
oxygen
tolerance,
this
is
successfully
applied
for
preparation
hydrogels.
Exploiting
enhanced
penetration
NIR
light,
gelation
effectively
performed
through
non‐transparent
biological
barriers.
Notably,
RAFT
agents
embedded
these
hydrogel
networks
can
be
reactivated
on‐demand,
enabling
healing
under
irradiation.
In
contrast
to
minimal
capability
(<15
%)
hydrogels
prepared
free
radical
(FRP),
RAFT‐mediated
display
more
than
80
%
recovery
tensile
strength.
Although
healable
polymer
UV
blue
lights
have
already
been
established,
work
first
photochemistry
using
facilitating
thick
Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 26, 2024
Abstract
We
report
a
conceptually
new
amplified
cascade
catalysis
that
converts
oxygen
to
hydroxyl
radical
for
controlled
RAFT
polymerization.
This
consists
of
two
sequential
reactions,
deoxygenation
catalyzed
by
glucose
oxidase
and
Fenton
reaction
ferrocene.
The
catalysts
can
communicate
with
each
other,
leading
ferrocene
recycling
hence
amplification
in
generation.
Ferrocene
was
confirmed
UV/Vis
spectroscopy,
molecular
docking
simulation,
electron
paramagnetic
resonance
as
well
polymerization
studies.
applied
various
monomers,
yielding
well‐defined
homopolymers
diblock
copolymers
weights
low
dispersities.
Poly(
N
,
‐dimethyl
acrylamide)
weight
over
1
million
g
mol
−1
also
successfully
synthesized
under
ambient
conditions.
Ferrocene‐functionalized
microspheres
were
prepared
used
recyclable
catalyst
five
consecutive
polymerizations
minimal
declination
monomer
conversion,
which
further
improved
the
ecofriendly
character
this
methodology.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 26, 2024
We
report
a
conceptually
new
amplified
cascade
catalysis
that
converts
oxygen
to
hydroxyl
radical
for
controlled
RAFT
polymerization.
This
consists
of
two
sequential
reactions,
deoxygenation
catalyzed
by
glucose
oxidase
and
Fenton
reaction
ferrocene.
The
catalysts
can
communicate
with
each
other,
leading
ferrocene
recycling
hence
amplification
in
generation.
Ferrocene
was
confirmed
UV/Vis
spectroscopy,
molecular
docking
simulation,
electron
paramagnetic
resonance
as
well
polymerization
studies.
applied
various
monomers,
yielding
well-defined
homopolymers
diblock
copolymers
weights
low
dispersities.
Poly(N,N-dimethyl
acrylamide)
weight
over
1
million
g
mol
Polymers,
Год журнала:
2023,
Номер
16(1), С. 134 - 134
Опубликована: Дек. 31, 2023
Herein,
a
series
of
ternary
amphiphilic
amide-containing
bottlebrushes
were
synthesized
by
photoiniferter
(PI-RAFT)
polymerization
macromonomers
in
continuous-flow
mode
using
trithiocarbonate
as
chain
transfer
agent.
Visible
light-mediated
under
mild
conditions
enabled
the
preparation
thermoresponsive
copolymers
with
low
dispersity
and
high
yields
very
short
time,
which
is
not
typical
for
classical
reversible
addition–fragmentation
process.
Methoxy
oligo(ethylene
glycol)
methacrylate
alkoxy(C12–C14)
used
basic
monomers
providing
properties.
The
study
investigated
how
modifying
comonomers,
acrylamide
(AAm),
methacrylamide
(MAAm),
N-methylacrylamide
(-MeAAm)
affect
features
bottlebrush
micelle
formation,
their
critical
concentration,
loading
capacity
pyrene,
hydrophobic
drug
model.
results
showed
that
process
scalable
can
produce
tens
grams
pure
copolymer
per
day.
unmodified
formed
unimolecular
micelles
at
temperatures
below
LCST
aqueous
solutions,
revealed
DLS
SLS
data.
incorporation
AAm,
MAAm,
N-MeAAm
units
resulted
an
increase
aggregation
numbers.
resulting
uni-
or
bimolecular
extremely
concentrations.
These
possess
making
them
promising
choice
targeted
delivery.
Angewandte Chemie,
Год журнала:
2023,
Номер
135(25)
Опубликована: Март 29, 2023
Abstract
We
report
an
aqueous
and
near‐infrared
(NIR)
light
mediated
photoinduced
reversible
addition–fragmentation
chain
transfer
(photo‐RAFT)
polymerization
system
catalyzed
by
tetrasulfonated
zinc
phthalocyanine
(ZnPcS
4
−
)
in
the
presence
of
peroxides.
Taking
advantage
its
fast
rates
high
oxygen
tolerance,
this
is
successfully
applied
for
preparation
hydrogels.
Exploiting
enhanced
penetration
NIR
light,
gelation
effectively
performed
through
non‐transparent
biological
barriers.
Notably,
RAFT
agents
embedded
these
hydrogel
networks
can
be
reactivated
on‐demand,
enabling
healing
under
irradiation.
In
contrast
to
minimal
capability
(<15
%)
hydrogels
prepared
free
radical
(FRP),
RAFT‐mediated
display
more
than
80
%
recovery
tensile
strength.
Although
healable
polymer
UV
blue
lights
have
already
been
established,
work
first
photochemistry
using
facilitating
thick
