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.
Dalton Transactions,
Год журнала:
2021,
Номер
50(39), С. 13841 - 13858
Опубликована: Янв. 1, 2021
The
spacing
of
salen-type
ligands
by
highly
flexible
permethylated
bridges
causes
the
derived
coordination
compounds
to
have
unexpected
material
properties
(
e.g.
,
liquid
crystallinity,
aggregation-induced
emission
or
negative
fluorescence
anisotropy).
Side-chain
liquid
crystal
elastomers
(SCLCEs)
containing
a
common
cholesteric
monomer
but
different
cross-linkers
(CLs)
are
described.
These
polysiloxane-based
were
synthesised
following
hydrosilylation
reaction
in
which
vinyl-terminated
and
divinyl-terminated
CL
appended
to
polymethylhydrosiloxane(PMHS)
backbone
presence
of
platinum
catalyst.
Four
such
by
varying
the
CLs-an
alkyl
CL,
phenyl-containing
biphenyl-based
an
azobenzene
CL.
Thermal,
mesomorphic
properties,
swelling
behavior,
mechanical
actuation
properties
discussed.
The
LCE
alkyl-CL
displayed
wider
phase
range,
higher
cross-link
density
noticeable
compared
other
elastomers.
Liquid Crystals,
Год журнала:
2023,
Номер
50(13-14), С. 2229 - 2243
Опубликована: Авг. 7, 2023
ABSTRACTIn
this
paper,
first
series
of
liquid
crystal
polymers
(PF)
synthesised
by
hydrosilylation
monomer
containing
furan
group
(MA),
cholesterol
(MB),
D
(+)-camphoric
acid
(MC)
and
cyano-group
(MD),
catalysed
platinum
catalyst.
Another
(EF)
is
the
Dies-Alder
reaction
former
cross-linker
bismaleimide
group.
The
results
Fourier
transform
infrared
spectroscopy
(FT-IR)
proton
nuclear
magnetic
resonance(1H
NMR)
showed
successful
preparation
various
monomers
as
well
polymers.
thermal
properties
two
were
characterised
differential
scanning
calorimetry
(DSC)
thermogravimetry
analysis
(TGA).
We
observed
dramatic
colour
changes
Grand-jean
textures
using
polarised
optical
macroscope
(POM).
POM
selective
reflection
that
both
are
cholesteric
crystals.
In
latter
series,
crosslinking
Diels-Alder
can
make
better
oriented,
which
maintain
their
wonderful
(LC)
texture
reflection,
at
same
time,
it
has
a
certain
regulation
effect
on
appearance
blue
texture.
X-ray
diffraction
(XRD)
further
proved
crystals.KEYWORDS:
Cholesteric
crystalelastomersoptical
propertiesselective
Disclosure
statementNo
potential
conflict
interest
was
reported
author(s).Additional
informationFundingJoint
fund
National
Natural
Science
Fundation
China
[U1708258].
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.
