ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
17(1), С. 2293 - 2303
Опубликована: Дек. 20, 2024
The
application
of
organic
solid–liquid
phase
change
materials
(PCMs)
is
limited
for
the
leakage
problem
after
and
high
rigidity.
In
this
work,
a
novel
flexible
solid–solid
PCM
(DXPCM)
was
synthesized
using
block
copolymerization
process
with
polyethylene
glycol
(PEG)
as
energy
storage
segment.
transition
temperature
(from
36.2
to
49.4
°C)
enthalpy
83.27
123.35
J/g)
DXPCM
could
be
changed
through
adjusting
molecular
weight
PEG.
introduction
hard
chain
segments
endowed
excellent
flexibility,
foldability,
mechanical
properties
at
room
temperature.
large
number
internal
hydrogen
bonds
π–π
stacking
provided
interesting
thermally
induced
switchable
adhesion
recyclability.
release
elastic
potential
ensured
that
recover
its
original
shape
being
deformed
by
external
forces.
It
worth
mentioning
exhibits
infrared
stealth
capability
it
can
absorb
latent
heat
long
period
time.
conclusion,
work
developed
film
strength,
adhesion,
recovery
capability,
which
has
great
in
stealth.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(42), С. 56862 - 56873
Опубликована: Окт. 14, 2024
Thermoplastic
polyurethanes
(TPUs)
are
one
of
the
most
appealing
materials
with
extensive
applications
in
biomedical
fields
due
to
their
versatile
mechanical
properties
and
excellent
biocompatibility.
In
response
escalating
challenges
bacterial
infections,
it
is
desirable
obtain
TPUs
intrinsic
antibacterial
activity,
particularly
for
application
devices
public
places.
Herein,
a
cationic
main-/side-chain
structure
regulation
strategy
TPU
hard
segment
was
adopted
introduce
optimize
activity.
This
achieved
by
synthesizing
two
types
quaternary
ammonium
salts
(QAS)-containing
chain
extenders,
i.e.,
N-methyl-N-alkyl-N,N-bis(2-hydroxyethyl)
bromide
(Mn,
where
n
represents
N-alkyl
length)
N,N-dimethyl-N-alkyl-N-2,3-propylene
glycol
(Dn),
from
N-methyldiethanolamine
(MDEA)
3-dimethylamino-1,2-propanediol
(DMAD),
respectively.
Given
structural
differences
between
Mn
Dn,
main-chain-type
PU-Mn
side-chain-type
PU-Dn
were
subsequently
obtained
QAS
groups
segment.
The
length,
content,
systematically
investigated
bactericidal
properties.
results
revealed
that
long
(from
C6
C14)
increased
activity
extenders
corresponding
films.
Besides,
films
showed
higher
contact-active
than
exerted
Remarkably,
almost
100%
Staphylococcus
aureus(S.
aureus)
could
be
killed
PU-D14
film
low
content
(1.6
wt
%).
All
good
thermal
stability
degradation
temperature
5%
mass
loss
(Td,5%)
above
300
°C.
Moreover,
displayed
tensile
strength
at
break
varying
20.7
47.5
MPa
ultimate
elongation
1000%.
negligible
hemolytic
activities.
Advanced Healthcare Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 1, 2024
Abstract
Tissue
adhesives
are
used
for
various
medical
applications,
including
wound
closure,
bleeding
control,
and
bone
healing.
Currently
available
options
often
show
weak
adhesion
or
cause
adverse
effects.
Recently,
there
has
been
an
increasing
interest
in
complex
coacervates
as
adhesives.
Complex
formed
by
mixing
oppositely
charged
macromolecules
that
associate
undergo
liquid‐liquid
phase
separation,
which
the
dense
bottom
is
coacervate.
strong
biocompatible,
underwater
adhesion.
The
properties
of
resulting
materials
tunable
intrinsic
factors
such
polymer
chemistry,
molecular
weight,
charge
density,
topology
macromolecules,
well
extrinsic
temperature,
pH,
salt
concentration.
Therefore,
interesting
new
candidates
In
this
review,
it
described
how
form
different
influence
their
behavior.
Next,
overview
recent
studies
on
context
presented.
application
hemostatic
embolic
agents,
skin
repair
adhesives,
soft
tissue
sealants
discussed.
Lastly,
additional
possibilities
utilizing
these
future
Macromolecules,
Год журнала:
2024,
Номер
57(21), С. 10098 - 10111
Опубликована: Окт. 30, 2024
Studies
on
structural
and
performance
changes
under
dynamic
loads,
such
as
cyclic
tension,
are
limited.
We
synthesized
a
casting
polyurethane
based
1,5-naphthalene
diisocyanate
with
exceptional
fatigue
resistance,
capable
of
withstanding
up
to
700,000
cycles
flexural
fatigue.
Tensile
tests
were
conducted
at
stretching
strain
amplitude
100%,
frequency
10
Hz,
ranging
from
10,000
100,000
investigate
the
microstructures
properties.
Atomic
force
microscopy
revealed
gradual
decrease
in
high
modulus
region
content,
while
medium
initially
increased
then
decreased,
low
showed
an
increasing
trend.
Transmission
electron
images
clearly
depicted
destruction
process
spherulites:
crystal
bundles
separated
spherulites,
cycles,
these
became
smaller,
eventually
evolving
into
"small
black
dots"
after
cycles.
Wide-angle
small-angle
X-ray
diffraction
analyses
indicated
that
crystallinity,
grain
size,
long
period
transition
layer
thickness
increased.
further
explored
correlation
between
evolution
performance,
elucidating
underlying
mechanisms.
This
study
provides
crucial
insights
polyurethanes
loading,
valuable
for
designing
durable,
fatigue-resistant
materials.
ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
6(22), С. 13764 - 13774
Опубликована: Ноя. 8, 2024
The
infected
microenvironment
provides
fertile
ground
for
bacterial
growth
and
the
progression
of
inflammation,
making
it
challenging
to
cure
related
diseases.
Here,
a
covalent
organic
polymer
(COP)-based
antibacterial
agent,
denoted
as
PF-COP,
was
developed.
PF-COP
has
intrinsic
photothermal
capacity,
which
allows
take
advantage
enhanced
synergistic
wound
infection
therapy.
prepared
via
copolymerization
piperazine
with
ferrocene
diformaldehyde
using
catalyst-free
aminal
chemistry,
in
units
could
easily
bind
acid
generate
cationic
skeleton,
while
components
convert
endogenous
H2O2
into
toxic
hydroxyl
radical.
This
effectively
regulates
microenvironment.
acidified
positively
charged
structures
enhance
material
adhesion
cell
membranes
improve
responsiveness,
significantly
improving
therapeutic
effect.
As
result,
amalgamating
enzyme
catalytic
capacities
serve
an
microenvironment-enhanced
agent.
It
disrupt
balance
microenvironment,
destroying
optimal
environment
bacteria
inducing
"bacterial
suicide",
regulate
promote
normal
cells,
thus
accelerating
healing.
Therefore,
this
work
presents
promising
construction
strategy
precise
development
COP-based
therapeutics
facilitating
healing
through
direct
infectious
utilization
regulation.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
17(1), С. 2293 - 2303
Опубликована: Дек. 20, 2024
The
application
of
organic
solid–liquid
phase
change
materials
(PCMs)
is
limited
for
the
leakage
problem
after
and
high
rigidity.
In
this
work,
a
novel
flexible
solid–solid
PCM
(DXPCM)
was
synthesized
using
block
copolymerization
process
with
polyethylene
glycol
(PEG)
as
energy
storage
segment.
transition
temperature
(from
36.2
to
49.4
°C)
enthalpy
83.27
123.35
J/g)
DXPCM
could
be
changed
through
adjusting
molecular
weight
PEG.
introduction
hard
chain
segments
endowed
excellent
flexibility,
foldability,
mechanical
properties
at
room
temperature.
large
number
internal
hydrogen
bonds
π–π
stacking
provided
interesting
thermally
induced
switchable
adhesion
recyclability.
release
elastic
potential
ensured
that
recover
its
original
shape
being
deformed
by
external
forces.
It
worth
mentioning
exhibits
infrared
stealth
capability
it
can
absorb
latent
heat
long
period
time.
conclusion,
work
developed
film
strength,
adhesion,
recovery
capability,
which
has
great
in
stealth.
