Owing
to
the
nontoxicity
of
monomers,
non-isocyanate
polyurethane
elastomers
have
attracted
considerable
attention,
yet
synthesis
and
functionalization
are
still
challenging.
Herein,
self-healing
reprocessable
biobased
(NIPU)
with
dual
dynamic
covalent
adaptive
network
(DDCAN)
by
disulfide
bonds
imine
were
synthesized
as
substrate
for
construction
flexible
strain
sensor
MXene
conductive
substance.
The
tensile
strength
elongation
at
break
NIPU
elastomer
3.22
MPa
234%,
respectively.
Thanks
formation
DDCAN,
showed
high
healing
efficiency
97.5%
after
room
temperature
24
h.
Interestingly,
possessed
superior
reprocessing
capability
three
cycles
reached
136.1%
original
one,
which
was
attributed
increase
crosslinking
points
caused
topological
rearrangement.
In
addition,
elastomer-based
exhibited
fast
response
(response
time
=60
ms)
excellent
repeatability
(1000
bending-releasing
cycles)
successfully
applied
human
motion
detection
speech
recognition.
findings
in
this
work
conceivably
stand
out
a
new
methodology
preparation
functional
elastomers,
will
greatly
promote
sustainable
development
application
electronics.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2023,
Volume and Issue:
11(48), P. 17190 - 17198
Published: Nov. 16, 2023
Currently
reported
epoxidized
natural
rubber
(ENR)-derived
elastomeric
vitrimers
were
usually
limited
by
the
poor
mechanical
properties
and
utilization
of
nonrenewable
chemicals
to
introduce
dynamic
cross-links.
In
this
study,
we
report
fully
biobased
mechanically
robust
based
on
imine
bonds
prepared
from
ENR,
vanillin,
1,10-decanediamine.
The
fabrication
procedures
included
two
steps,
i.e.,
preparation
a
cross-linker
(DC)
vanillin
1,10-decanediamine
subsequent
cross-linking
ENR
with
DC.
(BEVs)
different
DC/ENR
ratios
prepared,
effects
DC
contents
tensile
properties,
elasticity,
stress
relaxation,
reprocessability
BEVs
investigated
in
detail.
BEV
showed
increased
strength
Young's
modulus
but
reduced
elongation
at
break
an
increasing
content.
up
19.44
±
1.39
MPa
higher
than
880%
was
achieved
controlling
ratio.
All
excellent
elasticity
strain
recovery
ratio
80%
after
stretching
500%.
could
relax
rapidly
high
temperatures,
which
endowed
them
thermal
recyclability.
With
combination
robustness,
reprocessability,
recyclability,
exhibit
potential
as
sustainable
substitutes
conventional
ENR-derived
permanently
cross-linked
rubbers.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 14, 2024
The
emergence
of
covalent
adaptable
networks
(CANs)
based
on
dynamic
bonds
(DCBs)
presents
a
promising
avenue
for
achieving
resource
recovery
and
utilization.
In
this
study,
we
discovered
bond
called
selenacetal,
which
is
obtained
through
double
click
reaction
between
selenol
activated
alkynes.
Density
functional
theory
(DFT)
calculations
demonstrated
that
the
ΔG
formation
selenoacetals
ranges
from
12
to
18
kJ
mol
