Molecules,
Journal Year:
2024,
Volume and Issue:
29(18), P. 4413 - 4413
Published: Sept. 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.
Macromolecules,
Journal Year:
2023,
Volume and Issue:
56(23), P. 9804 - 9810
Published: Dec. 1, 2023
Polymerizations
driven
by
low-energy,
far-red
to
near-infrared
(NIR)
light
can
enable
mild,
biocompatible,
and
wavelength-selective
photocuring
for
the
fabrication
of
advanced
soft
materials.
This
arises
from
a
reduction
in
scattering
photodamage
long-wavelength
relative
commonly
employed
UV
light.
However,
photopolymerizations
with
NIR
are
slow
inefficient
thus
require
long
reaction
times,
high
intensities,
and/or
large
catalyst
loadings
analogous
light-driven
approaches.
To
overcome
these
limitations,
comprehensive
evaluation
aza-boron
dipyrromethene
(azaBODIPY)
derivatives
as
reactive
catalysts
efficiently
induce
polymerizations
is
presented.
Herein,
we
examine
how
introducing
electron-donating
groups
into
azaBODIPY
scaffolds
affects
polymerization
rate
(rp).
The
systematic
introduction
methoxy
functionality
resulted
∼5×
increase
rp
upon
exposure
(740
nm)
LED,
along
unprecedented
sensitivity
(0.7
mW/cm2,
=
0.1
M/s),
while
maintaining
good
temporal
control
over
photopolymerization.
Replacing
more
dimethylamino
enhanced
charge
transfer
(CT)
character
photoexcited
molecules,
which
enabled
low
intensity
LED
(850
nm,
∼55
M/s).
Furthermore,
transient
absorption
spectroscopy
revealed
direct
relationship
between
lifetime
CT
states
rp,
that
azaBODIPYs
bearing
at
aza-bridgehead
side
molecule
optimal
unveiled
design
principles
will
inform
next-generation
light-fueled
integration
emergent
additive
manufacturing
technologies.
ChemPhotoChem,
Journal Year:
2024,
Volume and Issue:
8(8)
Published: April 8, 2024
Abstract
In
this
study,
we
investigate
the
effect
of
terminal
benzene
derivatives
in
triphenylamine‐based
oxime
esters
on
their
photoreactivity.
Five
novel
(
Miko
series)
that
containing
different
as
groups,
were
synthesized.
The
electronic
properties
substituents
ring
range
from
electron‐donating
to
electron‐withdrawing.
Specifically,
a
methoxy
for
Miko‐MOB
,
tert
‐butyl
benezene
Miko‐
t
‐Bu
chloro
Miko‐CB
trifluoromethyl
Miko‐TFM
and
nitro
Miko‐NB
.
Additionally,
compound
with
only
substituent
TP‐1
)
was
selected
comparision.
All
new
compounds
exhibited
higher
molar
extinction
coefficients
than
steady‐state
photolysis
electron
spin
resonance
(ESR)
would
decrease
substitutes
electron‐withdrawing
substitutes.
Finally,
these
are
utilized
Type
I
photoinitiating
systems
free
radical
polymerization
trimethylolpropane
triacrylate
(TMPTA)
under
UV
or
LED@405
nm
light
irradiation
conditions.
Among
all
formulations,
demonstrated
highest
double
bond
conversion
efficiency
both
irradiation.
Thus,
play
an
important
role
tuning
optical
photochemical
reaction
performance,
offering
significant
value
design
strategy
such
photoinitiators.
Journal of Composites Science,
Journal Year:
2024,
Volume and Issue:
8(8), P. 295 - 295
Published: Aug. 1, 2024
The
miniaturization
and
high-power
density
of
modern
electronic
devices
pose
significant
thermal
management
issues,
particularly
affecting
their
performance
lifetime.
Ladder-like
polysilsesquioxanes
(LPSQs)
offer
a
promising
solution
due
to
remarkable
thermal,
mechanical,
chemical
properties.
By
incorporating
thermally
conductive
fillers,
LPSQ
composites
can
achieve
high
conductivity
(TC),
making
them
ideal
for
in
advanced
applications.
In
this
study,
LPSQ-based
nanocomposites
containing
functionalized
alumina
nanoparticles
were
prepared
by
casting
UV
curing,
the
effects
varying
amounts
Irgacure-184
photoinitiator
on
structural
properties
investigated.
Three
sets
samples
with
fixed
amount
LPSQs,
80
wt.%
nanoparticles,
1,
5,
or
10
respect
matrix.
TC
was
evaluated
from
measured
values
heat
capacity,
density,
diffusivity.
increased
60%,
71.2%,
93.1%
three
samples,
respectively,
compared
neat
Results
indicate
that
an
intermediate
(5%)
preserved
LPSQs’
integrity,
namely
presence
long
linear
silsesquioxane
chains,
provided
good
filler
dispersion
distribution,
polymerization
degree,
stability,
TC.
