Enhanced Multifunction in Polyurethane Elastomers via Regulation of Triple‐Crosslinked Network With Dynamic Covalent and Noncovalent Bonds
Journal of Applied Polymer Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 12, 2025
ABSTRACT
Self‐healing
polyurethane
elastomers
with
dynamic
crosslinking
networks
are
promising
candidates
for
intelligent
next‐generation
coatings.
However,
their
constitutive
relation
shows
conflicts
between
high
mechanical
performance
and
room‐temperature
self‐healing,
as
well
recyclability.
Here,
a
regulation
strategy
of
triple‐crosslinked
network
in
the
hard
domain
was
proposed
to
achieve
multifunction
enhancement
via
covalent
borate
ester
bonds
coupling
noncovalent.
The
distribution
ratio
bonds,
boron‐nitrogen
coordination
multiple
hydrogen
were
meticulously
designed
balance
fracture
reconstruction
molecular
network.
introduced
enabled
basic
self‐healing
through
molecule‐level
topological
evolution.
abundant
provided
external
noncovalent
reversible
networks,
thus
improving
tensile
strength
toughness
physical
points.
obtained
exhibited
impressive
light
transmittance
93%,
41.07
MPa,
elongation
at
break
1673.20%,
166.74
MJ
m
−3
,
almost
entirely
48
h.
These
even
maintained
90%
original
properties
after
suffering
three
recycles.
This
may
promote
practical
application
coatings
automobile
flexible
electronic
industry.
Язык: Английский
Influence of the structures of silane‐modified polyurethanes on the strength and toughness of epoxy resins and their composites
Polymer Composites,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 12, 2025
Abstract
To
improve
the
strength
and
toughness
of
epoxy
resins
their
composites,
a
series
silane‐modified
polyurethanes
(SM‐PUs)
was
synthesized.
The
SM‐PUs
were
then
incorporated
into
resin
system
to
prepare
polyurethane
toughened
composites.
relationship
between
structures
properties
systems
composites
investigated.
results
revealed
that
addition
can
effectively
both
toughness,
as
well
corrosion
resistance
systems.
Among
all
systems,
PUSiM/EP/DDM
with
two
benzene
rings
PUSiT/EP/DDM
ring
exhibited
highest
respectively.
maximum
values
tensile
strength,
elongation
at
break,
critical
stress
intensity
factor
(K
IC
),
energy
release
rate
(G
impact
reached
82.08
MPa,
10.06%,
1.64
MPa·m
1/2
,
1.77
kJ·m
−2
26.87
respectively,
showing
an
improvement
23.5%,
89.5%,
53.3%,
284.8%,
36.4%
over
those
for
EP/DDM.
Moreover,
PUSiT/EP/CF/DDM
prepared
by
using
best
showed
mechanical
performance.
Simultaneously,
strengthening
toughening
mechanisms
explored
through
SEM
simulated
internal
network.
Highlights
A
synthesized
EP.
Addition
enhanced
composite
high‐toughness
properties.
network
mechanisms.
Язык: Английский
Tough and self-healing polyurethane elastomer and its application for fiber-based self-encapsulating strain sensor
Chemical Engineering Journal,
Год журнала:
2025,
Номер
unknown, С. 162791 - 162791
Опубликована: Апрель 1, 2025
Язык: Английский
Facile synthesis amide‐functional anionic chain extenders for enhanced thermal stability and emulsion performance in waterborne polyurethanes
Polymer Engineering and Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 28, 2025
Abstract
While
increasing
the
number
of
these
extenders
improves
stability
waterborne
polyurethane
(WPU)
emulsion,
it
also
decreases
thermal
WPU
film,
creating
a
challenge
that
needs
to
be
addressed.
In
this
study,
class
scalable
anionic
chain
featuring
amide
functional
groups
is
thoughtfully
designed
for
industrial
applications.
Diethanolamine
reacts
with
various
anhydrides,
serving
as
an
internal
emulsifier
in
production.
The
prepared
features
narrow
particle
size
distribution,
averaging
between
100
and
250
nm,
resulting
excellent
even
after
centrifugation
at
3000
rpm.
Introducing
amide‐functional
into
structure
improved
stability,
T5
wt%
ranging
from
276.5
293.1°C.
Mechanical
test
results
indicate
WPU1
film
demonstrates
impressive
mechanical
performance,
tensile
strength
13.55
MPa
elongation
break
980%.
films
show
strong
adhesion
different
surfaces,
lap
shear
carbon
steel
varying
4.67
5.14
MPa.
This
presents
innovative
approach
balancing
emulsifying
capability
water
resistance
feature
WPU.
study
offers
promising
alternative
DMPA,
emphasizing
its
potential
future
use
production
Highlights
Synthesis
extenders.
Enhanced
emulsion
performance.
optimized
colloidal
characteristics.
enhanced
stability.
A
viable
2,2‐dimethylpropionic
acid‐based
systems.
Язык: Английский