Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 13, 2025
Abstract
Reversible
adhesives
permit
adaptability
and
sustainability
in
advanced
materials
devices.
However,
their
implementation
is
significantly
hampered
by
poor
adhesive
strength
owing
to
the
critical
trade‐off
between
interfacial
adhesion
cohesion
energy
preservation,
as
well
challenge
of
large‐scale
low‐cost
manufacturing.
Herein,
a
class
ultrastrong
reversible
integrating
epoxy
(EP)
polyurethane
(PU)
via
dynamic
furan‐maleimide
chemistry
reported,
which
features
well‐tunable
microphase‐separated
structures.
The
interspersed
rigid
EP
domains
provide
remarkable
cohesive
strength,
while
continuous
flexible
PU
phase
dissipates
mechanical
through
chain
extension
hydrogen‐bond
dissociation,
enhancing
both
toughness
adhesion.
This
unique
design
allows
precise
tuning
properties
across
large
range,
maintaining
thermo‐reversibility
enabling
scalable
Notably,
EP‐PU
achieves
an
ultrahigh
(34.6
MPa),
substantially
outperforming
most
reported
so
far,
matching
commercial
structural
standards.
Meanwhile,
displays
exceptional
multiple
reusability,
on‐demand
separation
capacity,
broad
substrate
compatibility,
satisfactory
environmental
stability.
Journal of Applied Polymer Science,
Journal Year:
2024,
Volume and Issue:
141(41)
Published: Aug. 25, 2024
Abstract
In
this
paper,
a
series
of
silicon
hybrid
polyurethane‐imides
(SPUI)
with
high
stability
were
constructed
by
introducing
diphenylsilanediol
(DPSD)
and
imidization
effect,
in
which
the
segment
character
hydrogen
bonding
adjusted.
Various
“sea‐island”
microphase
separations,
similar
evolution
from
blooming
flower
to
bud
like
microdomains
was
originating
hard
clusters,
where
distribution
labeled
visualized
stacking
heteroatom.
Comparing
pure
polyurethane
(PU),
tensile
strength
elongation
at
break
for
SPUIs
increased
0.71
±
0.04
17.67
1.84
MPa
84.39%
6.79%
202.38%
14.50%,
respectively.
Interestingly,
silicon‐induced
aggregates
segments
SPUI/graphite
flakes
(SPUI/GFs),
densely
crowded
around
GFs
except
some
dispersions,
revealing
coupling
agent
characters
SPUI
self‐affinity
GFs.
Thus,
performance
achieved
due
adjustable
percolation
cross‐linking
networks.
Percolation
thresholds
decreased
2.04
0.61
wt%
conductivity
1.0
×
10
0
S/m
contents
5.0
SPUIz/GFs‐500
achieved,
2–3
orders
magnitude
higher
than
that
SPUIz/GFs‐2000
conductivity,
far
lower
those
reported
composites.
Finally,
study
great
significance
developing
functional
PU
materials
performance.
