Macromolecules,
Год журнала:
2020,
Номер
53(12), С. 4678 - 4684
Опубликована: Июнь 3, 2020
Near-infrared
(NIR)
photoinduced
chemical
processes
are
highly
attractive
for
specific
applications
owing
to
the
deep
penetration
of
NIR
into
nontransparent
materials
including
biological
and
synthetic
materials.
Robust
atom
transfer
radical
polymerization
(photoATRP)
was
achieved
using
upconversion
nanoparticles
(UCNPs)
as
an
internal
light
converter
turn
a
980
nm
wavelength
UV/vislight.
This
photoATRP
capable
polymerizing
both
hydrophobic
hydrophilic
monomers
at
low
loading
ppm
concentrations
CuBr2/tris(2-pyridylmethyl)amine
catalyst
under
irradiation
(4
W/cm2)
UCNPs
with
reusable
performance,
providing
well-defined
polymers
predetermined
molecular
weight,
dispersity,
excellent
chain-end
fidelity.
The
switching
"on/off"
showed
temporal
control
polymerization.
exhibited
penetrations
through
several
visible
light-proof
barriers
light,
it
may
provide
future
directions
photopolymerization
in
systems,
especially
systems
containing
photosensitive
moieties.
Chemical Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
This
article
highlights
the
advancements
in
controlled
radical
polymerization
facilitated
by
three
external
regulations
of
oxygen,
light,
and
mechanical
force,
outlines
future
directions
polymerization.
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 16, 2025
In
traditional
atom
transfer
radical
polymerization
(ATRP),
oxygen
must
be
meticulously
eliminated
due
to
its
propensity
quench
species
and
halt
the
process.
Additionally,
oxidizes
lower-valent
Cu
catalyst,
compromising
ability
activate
alkyl
halides
propagate
polymerization.
this
study,
we
present
an
oxygen-driven
ATRP
utilizing
alkylborane
compounds,
a
method
that
not
only
circumvents
need
for
stringent
removal
but
also
exploits
as
essential
cofactor
promote
This
approach
exhibits
broad
compatibility
in
organic
or
aqueous
media,
yielding
well-defined
polymers
with
low
dispersity
(Đ
1.11)
molecular
weights
closely
aligned
theoretical
values.
Triethylborane
(Et3B)
air-stable
triethylborane-amine
complex
(Et3B-DMAP)
facilitate
controlled
under
open-to-air
conditions,
demonstrating
efficiency
across
wide
range
of
monomers.
Moreover,
technique
enables
successful
synthesis
protein–polymer
conjugates
supports
surface
modifications
nanoparticles
silicon
wafers
aerobic
conditions.
represents
robust
versatile
platform
precision
far-reaching
implications
materials
science,
biomedicine,
advanced
engineering.
ACS Catalysis,
Год журнала:
2020,
Номер
10(24), С. 14457 - 14515
Опубликована: Ноя. 24, 2020
Synthetic
polymer
chemistry
endeavors
to
imitate
the
spatial
and
temporal
control
exhibited
within
biological
systems
obtain
well-defined
polymeric
materials
with
unique
structures,
properties,
applications.
This
is
often
approached
through
development
of
dynamic
catalyst
(or
initiator)
that
use
external
stimuli
elicit
discrete,
site-specific
transformations
impact
polymerization.
Herein
we
highlight
developments
in
polymerizations
are
modulated
by
stimuli,
particular
focus
on
those
enable
notable
changes
kinetics,
monomer
selectivity,
architecture,
or
tacticity.
Examples
include
chemical
oxidants
reductants,
light,
applied
voltage,
mechanical
force.
Macromolecules,
Год журнала:
2018,
Номер
51(19), С. 7776 - 7784
Опубликована: Сен. 25, 2018
We
report
a
novel
photoiniferter
approach
toward
enabling
chemoselective
fragmentation
of
reversible
addition–fragmentation
chain
transfer
(RAFT)
polymerization
using
two
different
RAFT
agents.
Methyl
methacrylate
(MMA)
was
polymerized
in
the
presence
agents,
4-cyano-4-[(dodecylsulfanylthiocarbonyl)sulfanyl]pentanoic
acid
(CDTPA)
and
2-(dodecylthiocarbonothioylthio)propionic
(DTPA).
Both
agents
contain
same
Z-groups
but
R-leaving
groups.
Under
conditions,
only
one
agent
preferentially
fragmented
while
other
remained
inert.
This
led
to
synthesis
poly(methyl
methacrylate)
(PMMA)
with
close
correlations
between
theoretical
experimental
molecular
weights
narrow
weight
distributions
(Mw/Mn).
then
employed
homopolymerize
copolymerize
inimer,
2-(2-(n-butyltrithiocarbonate)propionate)ethyl
(BTPEMA),
under
green
light
CDTPA
trithiocarbonate
functionality
on
inimer
incapacitated
for
transfer.
Switching
blue
irradiation
allowed
photolysis
BTPEMA
grafting
second
monomer.
provided
facile
route
complex
macromolecular
architectures
such
as
comblike
bottlebrush
polymers
without
need
intermediate
steps,
postmodification.
Macromolecules,
Год журнала:
2020,
Номер
53(12), С. 4678 - 4684
Опубликована: Июнь 3, 2020
Near-infrared
(NIR)
photoinduced
chemical
processes
are
highly
attractive
for
specific
applications
owing
to
the
deep
penetration
of
NIR
into
nontransparent
materials
including
biological
and
synthetic
materials.
Robust
atom
transfer
radical
polymerization
(photoATRP)
was
achieved
using
upconversion
nanoparticles
(UCNPs)
as
an
internal
light
converter
turn
a
980
nm
wavelength
UV/vislight.
This
photoATRP
capable
polymerizing
both
hydrophobic
hydrophilic
monomers
at
low
loading
ppm
concentrations
CuBr2/tris(2-pyridylmethyl)amine
catalyst
under
irradiation
(4
W/cm2)
UCNPs
with
reusable
performance,
providing
well-defined
polymers
predetermined
molecular
weight,
dispersity,
excellent
chain-end
fidelity.
The
switching
"on/off"
showed
temporal
control
polymerization.
exhibited
penetrations
through
several
visible
light-proof
barriers
light,
it
may
provide
future
directions
photopolymerization
in
systems,
especially
systems
containing
photosensitive
moieties.
