Waterborne
polyurethane
(WPU)
with
self-healing
properties
is
highly
desirable
for
sustainable
development.
However,
balancing
the
mechanical
and
of
WPU
challenging.
In
this
study,
ultrahigh
performance
was
simultaneously
achieved
by
introducing
dopamine-modified
iron-oxide
nanoparticles
(Fe3O4@DA
NPs)
to
a
matrix
consisting
soft
poly(tetramethylene
ether)
glycol
segments
hard
isoforone
diisocyanate
dimethylolpropionic
acid
segments.
Consequently,
tensile
strength
toughness
WPU/Fe3O4@DA
composite
increased
63.6
MPa
179.35
MJ·m–3,
respectively;
these
values
correspond
improvements
276%
403%
over
those
pure
(16.9
44.50
respectively).
The
proposed
also
exhibited
excellent
ability
at
room
temperature;
that
is,
stress
strain
efficiencies
after
6
h
60
°C
93.5%
100%,
respectively.
This
because
Fe3O4@DA
NPs,
which
acted
as
reinforcing
fillers,
interacted
strongly
via
covalent
reaction
DA
amine
groups
WPU-matrix
isocyanate
groups,
remarkably
enhancing
properties.
Moreover,
catechol–Fe(III)
coordination
bonds
formed
between
Fe3O4
promoted
relaxation
behavior
and,
thus,
enhanced
efficiency.
approach
presented
in
study
constitutes
an
effective
strategy
developing
efficient
polymer
high
strength,
can
endow
coatings
adhesives
long
service
life
severe
environments.
Waterborne
polyurethane
(WPU)
with
self-healing
properties
is
highly
desirable
for
sustainable
development.
However,
balancing
the
mechanical
and
of
WPU
challenging.
In
this
study,
ultrahigh
performance
was
simultaneously
achieved
by
introducing
dopamine-modified
iron-oxide
nanoparticles
(Fe3O4@DA
NPs)
to
a
matrix
consisting
soft
poly(tetramethylene
ether)
glycol
segments
hard
isoforone
diisocyanate
dimethylolpropionic
acid
segments.
Consequently,
tensile
strength
toughness
WPU/Fe3O4@DA
composite
increased
63.6
MPa
179.35
MJ·m–3,
respectively;
these
values
correspond
improvements
276%
403%
over
those
pure
(16.9
44.50
respectively).
The
proposed
also
exhibited
excellent
ability
at
room
temperature;
that
is,
stress
strain
efficiencies
after
6
h
60
°C
93.5%
100%,
respectively.
This
because
Fe3O4@DA
NPs,
which
acted
as
reinforcing
fillers,
interacted
strongly
via
covalent
reaction
DA
amine
groups
WPU-matrix
isocyanate
groups,
remarkably
enhancing
properties.
Moreover,
catechol–Fe(III)
coordination
bonds
formed
between
Fe3O4
promoted
relaxation
behavior
and,
thus,
enhanced
efficiency.
approach
presented
in
study
constitutes
an
effective
strategy
developing
efficient
polymer
high
strength,
can
endow
coatings
adhesives
long
service
life
severe
environments.
