Research Square (Research Square),
Год журнала:
2023,
Номер
unknown
Опубликована: Окт. 16, 2023
Abstract
Siloxane-based
side-chain
liquid
crystal
elastomers
(SCLCEs)
containing
cholesteryl
4-(undec-10-en-1-yloxy)benzoate
mesogenic
unit
are
described.
The
cholesteric
mesogen
was
dimesomorphic
and
displayed
a
smectic
A
nematic
phases
having
phase
range
of
69°C
32°C
respectively.
Four
(polydomain
powders)
were
synthesized
by
employing
the
LC
mesogen,
polymethylhydrosiloxane
(PMHS)
backbone
four
different
cross-linkers
(alkyl,
phenyl,
biphenyl
azo)
through
hydrosilylation
reaction.
All
found
to
be
stable
up
300°C
exhibited
an
intercalated
lamellar
structure.
Among
studied,
wide
observed
for
LCE
4
with
azo
cross-linker
1
alkyl
low
range.
photoisomerization
(due
presence
azo-
group)
investigated
in
toluene
photostationary
state
trans-to-cis
conversion
at
150
s.
polymeric
films
also
prepared.
noticeable
bending
response
thermal
stimulus
alkyl,
phenyl
which
more
pronounced
cross-linker.
Nanomaterials,
Год журнала:
2021,
Номер
11(3), С. 813 - 813
Опубликована: Март 22, 2021
The
term
liquid
crystal
elastomer
(LCE)
describes
a
class
of
materials
that
combine
the
elastic
entropy
behaviour
associated
with
conventional
elastomers
stimuli
responsive
properties
anisotropic
crystals.
LCEs
consequently
exhibit
attributes
both
and
crystals,
but
additionally
have
unique
not
found
in
either.
Recent
developments
LCE
synthesis,
as
well
understanding
elastomers—namely
their
mechanical,
optical
properties—is
significant
relevance
to
biology
biomedicine.
are
abundant
nature,
highlighting
potential
use
biomimetics.
Their
exceptional
tensile
biocompatibility
led
research
exploring
applications
artificial
tissue,
biological
sensors
cell
scaffolds
by
exploiting
actuation
shock
absorption
properties.
There
has
also
been
recent
interest
using
model
for
morphogenesis.
This
review
provides
an
overview
some
aspects
which
different
branches
biomedicine,
discussing
how
advances
could
impact
future
applications.
Advanced Composites and Hybrid Materials,
Год журнала:
2024,
Номер
7(6)
Опубликована: Окт. 18, 2024
Abstract
Reducing
the
weight
and
profile
of
machinery
robotics
is
currently
a
prime
challenge
for
materials
scientists
engineers
alike.
Solving
this
could
lead
to
an
improvement
in
space
travel
feasibility,
manufacturing
capability,
birth
new
medical
interventions
technologies
altogether.
LCEs
are
considered
hold
good
potential
as
artificial
muscles
due
their
unique
molecular
structure.
With
recent
boom
science
emergence
advanced
fabrication
techniques,
LCE-based
muscles/flexible
actuators
at
cusp
commercialization.
can
now
be
fabricated
into
several
different
forms
(films,
fibers,
3D
printed
arbitrary
shapes).
Furthermore,
LCE
using
these
techniques
also
functionalized
so
that
they
controllably
triggered
actuating
via
stimuli
such
light
or
electrical
currents.
This
has
led
reports
which
boast
impressive
performance
muscles.
For
example,
recently
certain
Joule
heating
fibers
directly
stimulated
actuation
application
currents
actuate
on
sub-second
time
frames
outperform
human
skeletal
terms
stress.
Given
this,
whilst
there
no
commercial
applications
robotics,
we
believe
poised
soon
applicable
broader
field
inspired
us
author
review.
review
presents
overview
mechanisms,
synthetic
methods,
alignment
methods
LCEs.
In
addition,
provide
latest
achievements
means
inducing/controlling
We
do
aspiration
bridge
gap
exists
between
academia
industry
topic
Graphical
abstract
Illustration
acting
robotics.
Journal of Polymer Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 31, 2025
ABSTRACT
Liquid
crystalline
elastomers
(LCEs)
exhibit
reversible
macroscopic
shape
changes
in
response
to
a
temperature
change.
Mechanistically,
the
thermomechanical
of
LCEs
is
associated
with
thermotropic
nature
liquid
units
(i.e.,
mesogens)
polymer
network.
Upon
heating,
mesogen‐mesogen
interaction
LCE
disrupted,
which
transitions
organization
network
from
an
ordered
disordered
state.
The
disruption
order
affects
volumetric
distribution
macromolecular
chains
and
results
large
directional
contraction
along
alignment
axis.
Prior
reports
detail
that
magnitude
actuation
depends
strongly
on
connectivity
LC
mesogens
main‐chain
or
pendant)
within
In
this
study,
pendant
end‐on
are
introduced
into
primarily
supramolecular
composition
further
reduce
crosslink
density
while
preserving
overall
concentration.
introduction
compositions
improves
properties
by
enhancing
strain‐temperature
coupling
reducing
temperatures.
By
systematically
varying
concentrations
mesogens,
direct
relationships
established
between
mesogen
composition,
architecture,
resulting
performance
LCEs.
Dalton Transactions,
Год журнала:
2020,
Номер
49(23), С. 7697 - 7700
Опубликована: Янв. 1, 2020
We
report
herein
very
efficient
syntheses
of
new
functional
silanes
obtained
via
olefin
hydrosilylation.
New
bifunctional
compounds
contain
attractive
groups
such
as
epoxy,
fluoroalkyl,
trisilylamine,
chloropropyl,
and
methacroiloxy
which
can
play
different
roles
in
molecular
systems.
Moreover,
the
catalytic
system
proposed
by
us
exhibits
high
selectivity
tolerance
to
a
wide
range
groups.
It
also
permitted
obtaining
total
conversions
starting
reagents
relatively
short
time
under
mild
conditions.
