Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 4, 2024
Abstract
Mechanochromic
polymers
can
be
used
to
visualize
mechanical
stimuli
applied
materials.
However,
many
of
these
exhibit
single‐color
mechanochromism,
i.e.,
the
polymer
changes
from
its
original
color
another,
thus
potentially
limiting
range
applications.
Here,
a
versatile
and
readily
accessible
strategy
for
creating
multicolor
mechanochromic
blends
that
detect
whether
material
is
currently
under
stress
or
has
already
experienced
presented.
The
are
prepared
by
blending
segmented
polyurethane
polycaprolactone,
each
embedded
with
radical‐type
mechanochromophore.
These
appear
either
blue,
pink,
green
stretching
depending
on
mechanochromophore
employed.
introduction
different
mechanochromophores
into
polycaprolactone
chain
mobilities
subsequent
affords
blend
visually
distinguish
via
change
it
experiencing
recently
stress.
colors
observed
after
tuned
as
easily
mixing
paint
based
combination
(“rainbow
mechanochromism”).
developed
in
this
study
expected
significantly
advance
research
Angewandte Chemie,
Год журнала:
2024,
Номер
136(22)
Опубликована: Март 29, 2024
Abstract
With
the
prosperity
of
development
carbon
nanorings,
certain
topologically
or
functionally
unique
units‐embedded
nanorings
have
sprung
up
in
past
decade.
Herein,
we
report
facile
and
efficient
synthesis
three
cyclooctatetraene‐embedded
(
COTCNR
s)
that
contain
COTCNR1
COTCNR2
)
four
COTCNR3
COT
units
a
one‐pot
Yamamoto
coupling.
These
feature
hoop‐shaped
segments
Gyroid
(G‐),
Diamond
(D‐),
Primitive
(P‐)
type
schwarzites.
The
conformations
trimeric
are
shape‐persistent,
whereas
tetrameric
possesses
flexible
skeleton
which
undergoes
conformational
changes
upon
forming
host–guest
complexes
with
fullerenes
C
60
70
),
whose
co‐crystals
may
potentially
serve
as
fullerene‐based
semiconducting
supramolecular
wires
electrical
conductivities
on
order
10
−7
S
cm
−1
(for
⊂
−8
under
ambient
conditions.
This
research
not
only
describes
highly
one‐step
syntheses
distinctive
topological
schwarzites,
but
also
demonstrates
potential
application
electronics
one‐dimensional
fullerene
arrays
secured
by
.
Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
45(16)
Опубликована: Май 22, 2024
Mechanochromic
materials
have
received
broad
research
interests
recently,
owing
to
its
ability
monitor
the
in
situ
stress/strain
polymer
a
straightforward
way.
However,
one
major
setback
that
hinders
practical
application
of
these
is
their
low
sensitivity
toward
tensile
strain.
Here
new
strategy
for
pre-stretching
mechanochromic
agent
film
on
molecular
scale,
which
can
effectively
enhance
strain,
shown.
In
fluorescent
measurement
during
test
shows
an
early
activation
at
strain
as
50%.
The
effect
realized
by
first
inducing
ring-opening
functionalization,
and
then
compelling
ring-closure
process
cured
elevated
temperature.
This
post-curing
will
result
pre-stretched
crosslinked
network.
mechanism
films
with
different
composition
elaborated
visco-elastic
measurements,
further
confirmed
other
compositions.
Combined
simplicity
method
developed,
this
work
could
offer
alternative
agents
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
12(36), С. 14469 - 14484
Опубликована: Янв. 1, 2024
Mechanofluorophoric
polyurethane
elastomers
containing
dual
slide-ring
motion
of
daisy
chain
backbones
and
polyrotaxane
crosslinkers
are
created,
which
show
noble
mechanical
features
ratiometric
mechanofluorescent
responses
under
tensile
forces.
Angewandte Chemie,
Год журнала:
2024,
Номер
136(49)
Опубликована: Авг. 13, 2024
Abstract
Sterically
distorted
donor‐acceptor
π‐systems,
termed
DA
springs,
can
be
progressively
planarized
under
mechanical
load
causing
a
bathochromic
shift
of
the
photoluminescence
(PL)
spectrum.
By
combining
theory
and
experiment,
we
here
use
simple
linear
force
calibration
for
two
different
conformational
mechanochromophores
to
determine
molecular
forces
in
polymers
from
mechanochromic
PL
wavelength
during
multiple
uniaxial
tensile
tests.
Two
systems
are
used,
i)
highly
entangled
glassy
polyphenylene
ii)
covalent
elastomeric
polydimethylsiloxane
network.
The
mean
estimated
by
this
method
validated
using
known
threshold
mechanochemical
ring‐opening
reactions
spiropyran
probes.
agreement
between
both
approaches
underlines
that
these
springs
provide
unique
opportunity
online
monitoring
local
present
diverse
polymer
matrices.
Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 4, 2024
Abstract
Mechanochromic
polymers
can
be
used
to
visualize
mechanical
stimuli
applied
materials.
However,
many
of
these
exhibit
single‐color
mechanochromism,
i.e.,
the
polymer
changes
from
its
original
color
another,
thus
potentially
limiting
range
applications.
Here,
a
versatile
and
readily
accessible
strategy
for
creating
multicolor
mechanochromic
blends
that
detect
whether
material
is
currently
under
stress
or
has
already
experienced
presented.
The
are
prepared
by
blending
segmented
polyurethane
polycaprolactone,
each
embedded
with
radical‐type
mechanochromophore.
These
appear
either
blue,
pink,
green
stretching
depending
on
mechanochromophore
employed.
introduction
different
mechanochromophores
into
polycaprolactone
chain
mobilities
subsequent
affords
blend
visually
distinguish
via
change
it
experiencing
recently
stress.
colors
observed
after
tuned
as
easily
mixing
paint
based
combination
(“rainbow
mechanochromism”).
developed
in
this
study
expected
significantly
advance
research
