Angewandte Chemie,
Год журнала:
2024,
Номер
136(40)
Опубликована: Июнь 18, 2024
Abstract
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
−1
,
suggesting
its
potential
reversibility.
Dynamic
exchange
experiments
involving
small
molecules
polymers
provide
substantial
evidence
supporting
properties
selenoacetals.
By
utilizing
highly
efficient
reaction,
successfully
synthesized
materials
selenoacetal
with
remarkable
reprocessing
capabilities
without
any
catalysts.
These
exhibit
chemical
recycling
under
alkaline
conditions,
wherein
(SA)
can
decompose
into
active
enone
selenide
(ES)
diselenides.
Reintroducing
initiates
renewed
selenide,
facilitating
material
yielding
newly
developed
exhibiting
both
photo‐
thermal
responsiveness.
results
underscore
in
terms
recyclability
selective
degradation,
making
them
valuable
addition
conventional
networks.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2023,
Номер
11(48), С. 17190 - 17198
Опубликована: Ноя. 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,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 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
