Macromolecules,
Год журнала:
2024,
Номер
57(21), С. 9965 - 9976
Опубликована: Окт. 18, 2024
Hydrogels
prepared
through
free
radical
polymerization
hold
great
promise
for
large-scale
production
and
practical
applications
but
face
challenges
due
to
oxygen
inhibition
during
poor
mechanical
properties.
These
issues
often
necessitate
complex
structural
designs
time-consuming
anaerobic
processes.
This
work
presents
a
novel
approach
using
tetrahydroxydiboron
(THDB)
combined
with
potassium
persulfate
(KPS)
rapidly
produce
hydrogels
enhanced
properties
under
aerobic
conditions,
overcoming
traditional
limitations.
The
THDB-KPS
system
facilitates
the
gelation
of
acrylamide
(AM)
precursors
in
just
2
min
ambient
significantly
outperforming
existing
systems.
method
is
versatile
across
various
monomer
types,
including
hydrophilic,
electrolyte,
macromolecular
zwitterionic
monomers.
rapid
effect
stems
from
THDB's
ability
interact
dissolved
neutralize
inhibitory
effects
oxygen,
promote
decomposition
efficiently
by
homolytic
cleavage
(HO)2B·
radicals
coordination
N
or
O
vinyl
monomers
diboron
structure.
Meanwhile,
boron-induced
hydrogen
bonding
interactions,
along
fast
rise
temperature
viscosity
reaction
system,
contribute
shortened
time
as
well.
factors
also
lead
formation
multiple
physical
cross-links
well
network
densely
loosely
cross-linked
regions.
Consequently,
hydrogel
are
progressive
deformation
these
regions
breakage
cross-links.
reinforcement
remains
effective
even
challenging
acidic
alkaline
environments,
low
temperatures
impurity-laden
environments.
Therefore,
this
breakthrough
offers
scalable
efficient
producing
high-performance
harsh
promising
substantial
advancements
industrial
use
diverse
fields.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(11), С. 7533 - 7542
Опубликована: Март 7, 2024
Impact-stiffening
materials
that
undergo
a
strain
rate-induced
soft-to-rigid
transition
hold
great
promise
as
soft
armors
in
the
protection
of
human
body
and
equipment.
However,
current
impact-stiffening
materials,
such
polyborosiloxanes
shear-thickening
fluids,
often
exhibit
limited
response.
Herein,
we
propose
design
strategy
for
fabricating
highly
supramolecular
polymer
networks
by
leveraging
high-entropy-penalty
physical
interactions.
We
synthesized
fully
biobased
comprising
poly(α-thioctic
acid)
arginine
clusters,
whose
chain
dynamics
are
governed
specific
guanidinium-carboxylate
salt-bridge
hydrogen
bonds.
The
resulting
material
exhibits
an
exceptional
response
∼2100
times,
transitioning
from
dissipating
state
(21
kPa,
0.1
Hz)
to
stiffened
glassy
(45.3
MPa,
100
with
increasing
rates.
Moreover,
material's
high
energy-dissipating
hot-melting
properties
bring
excellent
damping
performance
easy
hybridization
other
scaffolds.
This
entropy-driven
approach
paves
way
development
next-generation
soft,
sustainable,
impact-resistant
materials.
Abstract
Currently,
research
on
thermal
interface
materials
(TIMs)
is
primarily
focused
enhancing
conductivity.
However,
strong
adhesion
and
multifunctionality
are
also
important
characteristics
for
TIMs
when
pursing
more
stable
heat
conduction.
Herein,
a
novel
poly(urethane‐urea‐imide)
(PUUI)
elastomer
containing
abundant
dynamic
hydrogen
bonds
network
reversible
disulfide
linkages
successfully
synthesized
application
as
TIM
matrix.
The
PUUI
can
self‐adapt
to
the
metal
substrate
surface
at
moderate
temperatures
(80
°C)
demonstrates
high
strength
of
up
7.39
MPa
aluminum
substrates
attributed
its
noncovalent
interactions
intrinsic
cohesion.
Additionally,
displays
efficient
self‐healing
capability,
which
restore
94%
original
mechanical
properties
after
6
h
room
temperature.
Furthermore,
composited
with
nitride
liquid
hybrid
fillers
conductivity
3.87
W
m
−1
K
while
maintaining
remarkable
capability
adhesion.
When
used
an
adhesive‐type
TIM,
it
achieves
low
contact
resistance
22.1
mm
2
zero
pressure,
only
16.7%
that
commercial
pads.
This
study
expected
break
current
paradigm
offers
new
insights
development
advanced,
reliable,
sustainable
TIMs.
ACS Applied Polymer Materials,
Год журнала:
2023,
Номер
6(1), С. 905 - 914
Опубликована: Дек. 27, 2023
With
the
rapid
development
of
electronic
skin,
smart
robots,
etc.,
past
few
years
have
witnessed
explosive
growth
in
number
flexible
sensors,
and
resulting
environmental
contamination
will
be
a
great
challenge.
Herein,
we
propose
strategy
to
synthesize
polyurethane
elastomer
with
good
self-healing
controlled
degradation
properties
for
stretchable
strain
sensor.
First,
polycaprolactone
diol
(PCL)
isophorone
diisocyanate
(IPDI)
were
used
as
monomers
isocyanate-terminated
prepolymer
further
reacted
adipic
dihydrazide
(ADH)
obtain
hierarchical
hydrogen
bonds.
By
prestretching
method,
sensor
was
fabricated
carbon
nanotubes
conductive
substance.
The
obtained
exhibited
high
tensile
strength
(16.28
MPa),
large
stretchability
(660%),
superior
crack
tolerance,
efficiency
(92.1%),
special
degradability
(4
h
0.5
mol/L
NaOH
solution).
showed
sensitivity
(GF
=
111.4),
fast
response/recovery
time
(161/180
ms),
repeatability
(3000
stretching–releasing
cycles)
successfully
applied
monitoring
minute
human
movements.
prepare
high-performance,
environmentally
friendly
elastomers
this
work
is
significance
sustainable
devices.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 12, 2024
Abstract
Intelligent
impact‐protection
wearable
devices
often
require
intricate
circuitry
to
operate,
which
hinders
the
timely
display
of
impact‐related
injuries.
Consequently,
it
is
imperative
develop
intelligent
protective
materials
that
are
self‐sufficient
and
capable
visualization.
In
this
work,
impact
protection
material
shear‐stiffening
gel
(SSG)
combined
with
mechanoluminescent
(ML)
ZnS:Cu/PDMS@SiO
2
create
ML‐SSG.
This
embodies
various
features,
including
protection,
force
visualization,
flame
resistance,
long‐distance
passive
control,
making
ideal
for
devices.
light
significant
shear
stiffening
effect
SSG,
ML‐SSG
effectively
dissipates
up
80%
energy
exhibits
excellent
resistance.
Concurrently,
also
visualizing
injuries,
displaying
warning
in
real‐time
via
mechanoluminescence,
assessing
based
on
intensity
mechanoluminescence.
The
incorporation
SiO
ZnS:Cu
has
resulted
remarkable
flame‐retardant
property.
innovative
significantly
improves
performance
complex
environments.
addition,
realizes
human–computer
interaction
through
neural
network
mechanoluminescence
characteristics.
research
expands
potential
applications
multifunctional
complicated
environments,
thereby
promoting
development
