Molecules,
Год журнала:
2024,
Номер
29(18), С. 4413 - 4413
Опубликована: Сен. 17, 2024
Novel
tetrafluoro-λ6-sulfanyl-containing
oligomers
prepared
by
visible
light-promoted
addition
of
1,4-(bis-chlorotetrafluoro-λ6-sulfanyl)
benzene
or
1,3-(bis-chlorotetrafluoro-λ6-sulfanyl)
to
either
1,4-diethynyl
the
1,3-diethynyl
isomers
form
hard,
stress
resistant
thin
films
on
spin
casting.
The
isomeric
were
utilized
establish
a
structure-function
relationship
for
mechanical
properties
from
oligomers.
Young’s
moduli
145-nm-thick
cured
could
reach
60
GPa.
measured
hardnesses,
between
1.57
and
2.77
GPa,
more
than
double
those
polymethyl
methacrylate
(PMMA)
films.
Curing
polymer
UV
irradiation
resulted
in
coatings
that
exhibited
remarkable
hardness
modulus
with
good
surface
adhesion
silicon.
Macromolecular Rapid Communications,
Год журнала:
2023,
Номер
45(1)
Опубликована: Июнь 26, 2023
Abstract
Functional
inks
for
light‐based
3D
printing
are
actively
being
searched
able
to
exploit
all
the
potentialities
of
additive
manufacturing.
Herein,
a
fast
visible‐light
photopolymerization
process
is
showed
conductive
PEDOT:PSS
hydrogels.
For
this
purpose,
new
Type
II
photoinitiator
system
(PIS)
based
on
riboflavin
(Rf),
triethanolamine
(TEA),
and
poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate)
(PEDOT:PSS)
investigated
visible
light
acrylic
monomers.
has
dual
role
by
accelerating
photoinitiation
providing
conductivity
obtained
Using
PIS,
full
monomer
conversion
achieved
in
less
than
2
min
using
light.
First,
PIS
mechanism
studied,
proposing
that
electron
transfer
between
triplet
excited
state
dye
(
3
Rf*)
amine
(TEA)
catalyzed
PEDOT:PSS.
Second,
series
poly(2‐hydroxyethyl
acrylate)/PEDOT:PSS
hydrogels
with
different
compositions
photopolymerization.
The
presence
negatively
influences
swelling
properties
hydrogels,
but
significantly
increases
its
mechanical
modulus
electrical
properties.
also
tested
commercially
available
Digital
Light
Processing
(DLP)
printer
(405
nm
wavelength),
obtaining
high
resolution
500
µm
hole
size
scaffolds.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(29), С. 19704 - 19709
Опубликована: Июль 9, 2024
The
lack
of
chemical
diversity
in
light-driven
reactions
for
3D
printing
poses
challenges
the
production
structures
with
long-term
ambient
stability,
recyclability,
and
breadth
properties
(mechanical,
optical,
etc.).
Herein
we
expand
scope
photochemistries
compatible
by
introducing
onium
photocages
rapid
formation
poly(thiourethanes)
(PTUs).
Efficient
nonsensitized
visible-light
photolysis
releases
organophosphine
-amine
derivatives
that
catalyze
thiol–isocyanate
polyaddition
excellent
temporal
control.
Two
resin
formulations
comprising
commercial
isocyanates
thiols
were
developed
digital
light
processing
(DLP)
to
showcase
fast
high-resolution
PTU
objects
disparate
mechanical
properties.
Onium
represent
valuable
tools
advance
manufacturing
next-generation
high-performance
sustainable
materials.
International Journal of Molecular Sciences,
Год журнала:
2024,
Номер
25(8), С. 4289 - 4289
Опубликована: Апрель 12, 2024
Dyes
based
on
quinoline
and
quinoxaline
skeletons
were
designed
for
application
as
visible
light
photoinitiators.
The
obtained
compounds
absorb
electromagnetic
radiation
the
border
between
ultraviolet
light,
which
allows
use
of
dental
lamps
sources
during
initiation
photopolymerization
reaction.
Their
another
desirable
feature
is
ability
to
create
a
long-lived
excited
state,
enables
chain
reaction
proceed
through
mechanism
intermolecular
electron
transfer.
In
two-component
photoinitiating
systems,
in
presence
an
donor
or
hydrogen
atom
donor,
synthesized
show
excellent
abilities
photoinitiate
polymerization
acrylates.
control
tests,
efficiency
using
modified
derivatives
comparable
that
typical,
commercial
photoinitiator
dentistry,
camphorquinone.
Moreover,
tested
requires
small
amount
(only
0.04%
by
weight)
initiate
research
also
showed
significant
acceleration
process
shortening
time.
practice,
this
means
new
initiating
systems
can
be
used
much
lower
concentrations
without
slowing
down
speed
obtaining
polymer
materials.
It
worth
emphasizing
these
two
features
system
allow
cost
reduction
reducing
financial
outlays
both
materials
(photoinitiators)
electricity.
