Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 18, 2024
Abstract
Currently,
there
are
only
few
reports
on
water‐soluble
photoinitiating
systems.
In
this
study,
a
highly
organic
dye
i.e.
sodium
(E)‐3,3′‐((4‐(2‐(3‐methylbenzo[
d
]thiazol‐3‐ium‐2‐yl)vinyl)phenyl)azanediyl)dipropionate
iodide,
was
synthesized
and
served
as
photoinitiator.
Notably,
initiator,
at
low
concentration
of
just
0.01
wt%,
demonstrates
high
photoinitiation
ability,
with
some
hydrogel
formulations
achieving
nearly
100%
double
bond
conversion
under
sunlight.
Photopolymerization
kinetics
were
monitored
using
Real‐Time
Fourier
Transform
Infrared.
To
explore
the
complex
chemical
principles
radical
polymerization,
UV‐visible
absorption
fluorescence
spectroscopy,
steady‐state
photolysis,
quenching
experiments
cyclic
voltammetry
employed
to
gain
comprehensive
understanding
photochemical
mechanism
involved.
Additionally,
several
characteristics
hydrogels
also
investigated
water
content,
swelling,
volume
swelling.
addition
their
excellent
capabilities,
developed
in
study
supported
3D
printing.
objects
smooth
surface
spatial
resolution
could
be
successfully
printed
direct
laser
writing.
The
fabricated
reversibly
change
shape
response
(adding
or
removing
water),
enabling
successful
4D
printing
behavior.
Furthermore,
efficient
ability
opens
new
avenues
for
sunlight‐polymerized
potential
applications
bioprinting.
Macromolecular Materials and Engineering,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 5, 2025
Abstract
Using
additive
manufacturing
(AM)
technologies
for
the
fabrication
of
advanced
polymeric
objects
is
a
logical
progression
to
realize
their
potential
within
engineering
applications
that
demand
complex
geometries.
Thiol‐X
chemistry
has
presented
itself
as
diverse
and
invaluable
toolkit
accomplish
such,
satisfying
both
processing
requirements
properties
desired
fabricate
range
using
variety
AM
technologies.
The
“click”
nature
many
thiol‐X
reactions,
mechanisms
polymerization,
functional
group
tolerance
orthogonality,
desirable
achievable
with
presents
synergistic
opportunity
few
other
chemistries
can
broadly
facilitate.
As
result,
use
gained
rapid
traction
in
recent
years
it
now
case
are
being
viewed
two
sides
same
coin,
whereby
scope
limitations
whole
system
appreciated.
This
review
highlights
advancements,
status,
scope,
opportunities
achieve
polymers
by
critically
examining
structure‐property‐processing‐performance
relationships
between
different
various
Macromolecular Rapid Communications,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 21, 2025
Abstract
Hexaarylbiimidazole
(HABI)
molecules
have
awakened
a
broad
interest
in
photo‐processing,
super‐resolution
imaging,
photoinduced
self‐healing
materials,
and
photomechanical
hydrogels
due
to
their
excellent
photosensitivity
photo‐induced
cleavage
properties.
In
this
work,
novel
photoswitchable
branched
polyurethanes
(BPU),
which
are
synthesized
by
copolymerizing
HABI
with
glycerol,
isophorone
diisocyanate
(IPDI),
polyethylene
glycol
(PEG
400
),
is
designed.
7‐Diethylamino‐4‐methylcoumarin
(DMCO)
introduced
as
radical
quencher,
can
not
only
avoid
the
hydroxyl
interfering
from
conventional
scavengers
during
polymerization
process
but
also
promote
efficient
quenching
of
TPIR
radicals.
By
optimizing
DMCO
concentration,
content,
high‐quality
lithographic
patterns
achieved
high
film
retention
at
low
exposure
doses.
The
structure
exhibits
superior
solubility
after
compared
previous
crosslinked
systems.
This
work
provides
HABI‐based
polyurethane,
acts
one
potential
candidates
for
UV‐positive
photoresists.
Leveraging
the
kinetic
selectivity
of
various
thiol-based
chemistries,
sequential
thiol-Michael
and
thiol–ene
reactions
were
applied
semiorthogonally
toward
holographic
recording,
thereby
expanding
available
toolbox
for
developing
thiol–ene-based
optical
recording
media.
In
a
unique
ternary
mixture,
thiol
glycolates
are
highly
favored
kinetically
due
to
higher
stability
therefore
enhanced
reactivity
thiolate
anion
as
compared
with
aliphatic
thiols
in
reaction.
The
glycolate
is
base-catalyzed
react
Michael
acceptor,
i.e.,
an
electron-deficient
double
bond,
form
first-stage
matrix,
leaving
most
unreacted
successive
photopolymerization.
Through
product
ratios
obtained
from
1H
NMR,
high
was
demonstrated
small
molecule
model
studies,
which
significant
excess
loading
monomer
utilized
(up
five-fold
functional
groups).
Furthermore,
two-stage
behavior
evaluated
bulk
material
system
comprised
multifunctional
monomers
through
photorheology.
resultant
films,
robust
elastomers,
exhibit
spatiotemporal
control
photopatterning.
Taking
advantage
decoupled
choice
realize
theoretical
refractive
index
contrast
between
two
stages,
transmission
gratings
recorded
similar
formulations,
yielding
peak-to-mean
0.0064
fidelity
spatial
resolution
even
at
size
scale
620
nm
period.
