Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 3, 2024
Abstract
Covalent
adaptable
networks
(CANs),
leveraging
the
dynamic
exchange
of
covalent
bonds,
emerge
as
a
promising
material
to
address
challenge
irreversible
cross‐linking
in
thermosetting
polymers.
In
this
work,
we
explore
introduction
catalyst‐free
and
associative
C=C/C=N
metathesis
reaction
into
polyurethanes,
creating
CANs
with
superior
stability,
solvent
resistance,
thermal/mechanical
properties.
By
incorporating
reaction,
stress‐relaxation
is
significantly
accelerated
compared
imine‐bond‐only
networks,
rate
adjustable
by
modifying
substituents
ortho
position
double
bonds.
The
obtained
plasticity
enables
recycle
without
altering
chemical
structure
or
mechanical
properties,
also
found
be
vital
for
achieving
shape
memory
functions
complex
spatial
structures.
This
new
crosslinker
polymer
has
potential
accelerate
ongoing
exploration
malleable
functional
thermoset
Chemical Science,
Год журнала:
2024,
Номер
15(28), С. 10997 - 11004
Опубликована: Янв. 1, 2024
o
-Nitrostyryl-pyridinium
ions
(NSPs)
are
easily
accessible
electrophiles
that
react
rapidly
and
irreversibly
with
sulfhydryl
groups
accompanied
by
a
large
bathochromic
shift.
