Macromolecular Rapid Communications,
Journal Year:
2024,
Volume and Issue:
45(13)
Published: May 5, 2024
Abstract
The
preparation
of
self‐healing
polyurethane
elastomers
(PUEs)
incorporating
dynamic
bonds
is
considerable
practical
significance.
However,
developing
a
PUE
with
outstanding
mechanical
properties
and
high
efficiency
poses
significant
challenge.
Herein,
this
work
has
successfully
developed
series
PUEs
various
through
rational
molecular
design.
These
incorporate
m‐xylylene
diisocyanate
reversible
dimethylglyoxime
as
hard
segment,
along
polytetramethylene
ether
glycol
soft
segment.
A
amount
oxime‐carbamate
hydrogen
are
formed
in
microphase
separated
structure
the
enables
them
to
be
colorless
transparency
>90%.
Owing
chemical
composition
multiple
interactions,
endowed
ultra‐high
tensile
strength
34.5
MPa,
satisfactory
toughness
53.9
MJ
m
−3
,
great
elastic
recovery
both
at
low
strains.
movement
polymer
chains
interactions
render
101%
70
°C.
In
addition,
could
still
maintain
after
recycling.
This
study
provides
design
strategy
for
comprehensive
superior
overall
performance,
which
holds
wide
application
prospects
fields
flexible
displays
solar
cells.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(2), P. 2683 - 2691
Published: Jan. 5, 2024
Balancing
the
mechanical
strength
and
self-healing
performance
of
polyurethane
(PU)
remains
a
significant
challenge
in
achieving
excellent
self-repairing
PU
materials.
In
this
study,
waterborne
elastomer
was
designed
from
bionic
concept
by
incorporating
2′-deoxythymidine
(2′-dT)
isophorone
diamine
(IPDA)
into
polymer
chain.
The
loose
stacking
IPDA's
irregular
cycloaliphatic
structure
resulted
arrangement
urethane
bonds
hard
domain.
formation
sextuple
hydrogen
between
2′-dT
bonds,
as
well
quadruple
themselves,
enhanced
properties
material.
multiple
can
dissociate,
recombine,
dissipate
energy,
thereby
improving
material's
repair
capability.
hierarchical
self-assembly
enabled
to
achieve
tensile
15.3
MPa
toughness
100.75
MJ/m3.
prepared
film
is
highly
transparent
has
transmittance
more
than
90%.
Additionally,
it
undergo
rapid
under
high
temperatures
or
trace
solvent
conditions.
When
used
flexible
conductive
substrate,
quickly
restored
conductivity
lifespan
after
surface
damage.
This
environmentally
friendly
will
hold
broad
application
prospects
field
electronic
devices.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(22)
Published: Feb. 5, 2024
Abstract
Developing
the
elastomer
materials
with
high
mechanical
robustness
through
simple
and
environmentally
friendly
methods
poses
significant
challenges.
In
this
research,
a
solvent‐free
polymerization
method
is
reported
to
synthesize
transparent
polyurea‐urethane
using
polycaprolactone
(PCL)
as
soft
segment
adjusting
various
hard
segments.
The
target
successfully
combine
acceptable
performance
exceptional
crack
tolerance,
whereby
notched
samples
can
readily
lift
25000
times
(a
rarely
value)
its
weight.
Moreover,
superhigh
elastic
restorability
allow
recover
original
dimension
from
elongation
over
5
or
fracture.
These
results
are
attained
due
presence
of
densely
uniformly
distributed
microdomains
within
elastomer,
leading
effective
energy
dissipation.
Furthermore,
owing
linear
structure
molecular
chains
reversible
hydrogen‐bonding
interactions
between
chains,
be
conveniently
healed
recycled
under
heating
conditions.
This
research
provide
general
feasible
strategy
for
construction
comprehensive
properties,
elastomers
expected
applied
in
emerging
fields
such
protective
elements
flexible
electronics.
Advanced Science,
Journal Year:
2024,
Volume and Issue:
11(22)
Published: April 11, 2024
Abstract
Elastomers
are
widely
used
in
daily
life;
however,
the
preparation
of
degradable
and
recyclable
elastomers
with
high
strength,
toughness,
excellent
crack
resistance
remains
a
challenging
task.
In
this
report,
polycaprolactone‐based
poly(urethane‐urea)
elastomer
is
presented
mechanical
properties
by
optimizing
arrangement
hard
segment
clusters.
It
found
that
long
alkyl
chains
chain
extenders
lead
to
small
evenly
distributed
clusters,
which
beneficial
for
improving
properties.
Together
multiple
hydrogen
bond
structure
stress‐induced
crystallization,
obtained
exhibits
strength
63.3
MPa,
an
toughness
431
MJ
m
−3
outstanding
fracture
energy
489
kJ
−2
,
while
maintaining
good
recyclability
degradability.
believed
holds
great
promise
various
application
fields
it
contributes
development
sustainable
society.
SusMat,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 13, 2024
Abstract
The
capacity
of
biological
tissues
to
undergo
self‐healing
is
crucial
for
the
performance
functions
and
continuation
life.
Conventional
intrinsic
materials
demonstrate
analogous
functionality
depending
on
dissociation‐recombination
reversible
bonds
with
no
need
extra
repair
agents.
However,
trade‐off
relationship
between
mechanical
strength
kinetics
in
systems,
coupled
lack
additional
functionality,
restricts
their
service
life
practical
applications.
Diversified
highly
ordered
structures
organisms
significantly
affect
energy
dissipation
mechanism,
signal
transmission
efficiency,
molecular
network
reconstruction
capability
due
multi‐dimensional
differentiated
macroscopic
composite
constructions,
microscopic
orientation
textures,
topologies/bonding
types
at
level.
These
architectures
exhibit
distinctive
strengthening
mechanisms
functionalities,
which
provide
valuable
references.
This
review
aims
providing
current
status
advanced
biomimetic
internal
micro/nanostructures.
Through
highlighting
specific
examples,
classifications,
design
inspirations,
fabrication
strategies
these
newly
developed
based
integrating
dynamic
interactions
nano/microstructures
are
outlined.
Furthermore,
balance
mechanisms,
structure–functionalization
relationships,
potential
application
values
discussed.
concludes
a
perspective
challenges,
opportunities,
prospects
development,
application,
promotion
self‐healable
bio‐like
architectures.
Macromolecules,
Journal Year:
2024,
Volume and Issue:
57(7), P. 3047 - 3057
Published: March 20, 2024
High-strength
elastomers
capable
of
room-temperature
healing
hold
promising
applications
in
flexible
electronics.
However,
the
unwanted
spontaneous
merging
for
incorrect
contact
(such
as
folding
or
stacking)
during
use
process
will
prevent
widespread
promotion
these
elastomers.
By
simulating
strengthening
and
processes
natural
skin,
a
series
robust
kinetically
stable
poly(urea-urethane)
(PUU)
were
synthesized
by
integrating
three
reversible
interactions,
including
dynamic
disulfide
bonds,
hierarchical
hydrogen
strain-induced
crystallization,
into
polymer
chains.
Among
elastomers,
PUU-DTDA9
exhibits
high
strength
(40
MPa),
exceptional
transient
self-healing
ability
(97.71%
efficiency
tensile
strength),
good
kinetic
stability
(no
occurs
at
area
after
it
is
kept
room
temperature
24
h).
The
exchangeability
bonds
was
locked
with
moderate
density
chains,
ensuring
elastomer
under
service
conditions.
This
prevents
undesired
efficiently
while
gaining
an
excellent
triggered
ethanol
temperature.
Furthermore,
to
simulate
ion
transport
capabilities
mixed
ionic
liquid
prepare
sensitive
multifunctional
skin
(18
MPa)
ability,
showing
potential
high-performance
wearable
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(2), P. 2802 - 2813
Published: Jan. 5, 2024
Due
to
the
multiple
different
properties
in
self-healing
elastomers
that
are
mutually
exclusive
based
on
and
contradictory
molecule
chain
structures,
simultaneously
achieving
ultrahigh
mechanical
performance
high
durability
of
is
a
great
challenge
goal
has
always
been
pursued.
Herein,
we
report
novel
strategy
fabricate
elastomer
by
introducing
interlaced
hydrogen
bonds
with
superhigh
binding
energy.
Distinguishing
from
quadruple
reported
already,
bond
lower
repulsive
secondary
interaction
higher
energy
composed
two
units
lengths
steric
hindrance.
Connected
bonds,
supramolecule
interlocking
network
formed
lock
polymer
chains
at
room
temperature,
endowing
poly(urethane–urea)
an
unprecedented
strength
(117.5
MPa,
even
than
some
plastics),
fracture
(522.46
kJ
m–2),
excellent
puncture
resistance
(puncture
force
reached
181.9
N).
Moreover,
also
exhibited
(healing
efficiency
up
95.8%),
transparency
(the
average
transmittance
91.0%),
good
(including
thermal
decomposition
resistance,
oxidation
aging
water
solvent
resistance),
providing
theoretical
basis
technical
reference
development
broadening
application
prospects
elastomers.
