Macromolecules,
Год журнала:
2022,
Номер
55(5), С. 1620 - 1628
Опубликована: Фев. 15, 2022
Three-dimensional
(3D)
printing
based
on
photoinduced
reversible
addition–fragmentation
chain
transfer
(RAFT)
polymerization
is
emerging
as
a
versatile
and
powerful
method
to
prepare
"living"
3D
objects,
which
can
be
postmodified
with
various
functionalities.
However,
an
additional
photoinitiator
or
photocatalyst
necessary
in
these
systems,
toxic
will
cause
negative
effects
the
properties
of
prepared
materials.
Here,
we
report
oxygen-tolerant
rapid
living
photoiniferter
RAFT
polymerization,
does
not
need
photoinitiators
photocatalysts.
A
xanthate,
O-ethyl-S-2-ethyl
propionate,
was
chosen
both
agent
this
process.
Various
monomers
agents
were
screened
system.
Materials
different
utilizing
postfunctionalization
printed
objects.
Furthermore,
polymer
welding
proposed
by
painting
fresh
between
two
objects
for
post-photocuring.
This
polymerization-based
also
successfully
applied
commercial
digital
light
processing
technique-based
printer,
offering
facile
fabricate
materials
shapes.
Abstract
The
development
of
advanced
materials
based
on
well‐defined
polymeric
architectures
is
proving
to
be
a
highly
prosperous
research
direction
across
both
industry
and
academia.
Controlled
radical
polymerization
techniques
are
receiving
unprecedented
attention,
with
reversible‐deactivation
chain
growth
procedures
now
routinely
leveraged
prepare
exquisitely
precise
polymer
products.
Reversible
addition‐fragmentation
transfer
(RAFT)
powerful
protocol
within
this
domain,
where
the
unique
chemistry
thiocarbonylthio
(TCT)
compounds
can
harnessed
control
vinyl
polymers.
With
intense
recent
focus
RAFT,
new
strategies
for
initiation
external
have
emerged
that
paving
way
preparing
polymers
demanding
applications.
In
work,
cutting‐edge
innovations
in
RAFT
opening
up
technique
broader
suite
researchers
explored.
Emerging
activating
TCTs
surveyed,
which
providing
access
into
traditionally
challenging
environments
polymerization.
latest
advances
future
perspectives
applying
RAFT‐derived
also
shared,
goal
convey
rich
potential
an
ever‐expanding
range
high‐performance
ACS Central Science,
Год журнала:
2020,
Номер
6(9), С. 1555 - 1563
Опубликована: Авг. 20, 2020
Light-driven
3D
printing
to
convert
liquid
resins
into
solid
objects
(i.e.,
photocuring)
has
traditionally
been
dominated
by
engineering
disciplines,
yielding
the
fastest
build
speeds
and
highest
resolution
of
any
additive
manufacturing
process.
However,
reliance
on
high-energy
UV/violet
light
limits
materials
scope
due
degradation
attenuation
(e.g.,
absorption
and/or
scattering).
Chemical
innovation
shift
spectrum
more
mild
tunable
visible
wavelengths
promises
improve
compatibility
expand
repertoire
accessible
objects,
including
those
containing
biological
compounds,
nanocomposites,
multimaterial
structures.
Photochemistry
at
these
longer
currently
suffers
from
slow
reaction
times
precluding
its
utility.
Herein,
novel
panchromatic
photopolymer
were
developed
applied
for
first
time
realize
rapid
high-resolution
printing.
The
combination
electron-deficient
electron-rich
coinitiators
was
critical
overcoming
speed-limited
photocuring
with
light.
Furthermore,
azo-dyes
identified
as
vital
resin
components
confine
curing
irradiation
zones,
improving
spatial
resolution.
A
unique
screening
method
used
streamline
optimization
exposure
azo-dye
loading)
correlate
composition
resolution,
cure
rate,
mechanical
performance.
Ultimately,
a
versatile
general
visible-light-based
shown
afford
(1)
stiff
soft
feature
sizes
<100
μm,
(2)
up
45
mm/h,
(3)
isotropy,
rivaling
modern
UV-based
technology
providing
foundation
which
bio-
composite-printing
can
emerge.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(39)
Опубликована: Март 22, 2023
Abstract
The
rapid
development
of
additive
manufacturing
has
fueled
a
revolution
in
various
research
fields
and
industrial
applications.
Among
the
myriad
advanced
3D
printing
techniques,
two‐photon
polymerization
lithography
(TPL)
uniquely
offers
significant
advantage
nanoscale
print
resolution,
been
widely
employed
diverse
fields,
for
example,
life
sciences,
materials
mechanics,
microfluidics.
More
recently,
by
virtue
optical
transparency
most
resins
used,
TPL
is
finding
new
applications
optics
photonics,
with
nanometer
to
millimeter
feature
dimensions.
It
enables
minimization
elements
systems,
exploration
light‐matter
interactions
degrees
freedom,
never
possible
before.
To
review
recent
progress
related
research,
it
starts
fundamentals
material
formulation,
then
discusses
novel
fabrication
methods,
wide
range
These
notably
include
diffractive,
topological,
quantum,
color
optics.
With
panoramic
view
development,
concluded
insights
perspectives
future
potential
Chemical Reviews,
Год журнала:
2022,
Номер
122(6), С. 5476 - 5518
Опубликована: Янв. 4, 2022
Over
the
past
decade,
use
of
photocatalysts
(PCs)
in
controlled
polymerization
has
brought
new
opportunities
sophisticated
macromolecular
synthesis.
However,
selection
PCs
these
systems
been
typically
based
on
laborious
trial-and-error
strategies.
To
tackle
this
limitation,
computer-guided
rational
design
knowledge
structure-property-performance
relationships
emerged.
These
strategies
provide
rapid
and
economic
methodologies
for
tuning
performance
functionality
a
system,
thus
providing
further
polymer
science.
This
review
provides
an
overview
employed
photocontrolled
summarizes
their
progression
from
early
to
current
state-of-the-art.
Background
theories
electronic
transitions
are
also
introduced
establish
perspective
quantum
chemistry.
Typical
examples
each
type
structure-property
then
presented
enlighten
future
polymerization.
