Polysquaramides
ACS Macro Letters,
Год журнала:
2024,
Номер
13(8), С. 972 - 978
Опубликована: Июль 22, 2024
Thermoplastics,
while
advantageous
for
their
processability
and
recyclability,
often
compromise
thermochemical
stability
mechanical
strength
compared
to
thermosets.
Addressing
this
limitation,
we
introduce
an
innovative
approach
employing
reversibly
cross-linked
polymers,
utilizing
squaramide
moieties
reconcile
recyclability
robustness.
Herein,
detail
the
synthesis
of
supramolecularly
polysquaramides
through
condensation
polymerization
diethyl
squarate
with
primary
secondary
diamines.
This
methodology
embeds
hydrogen-bonding
motifs
into
polymer
chains,
yielding
materials
significantly
enhanced
storage
moduli,
reaching
up
1.2
GPa.
Material
characterization
via
dynamic
analysis,
creep-recovery,
stress
relaxation
experiments
delineate
a
distinctive
rubbery
plateau
across
broad
temperature
range,
excellent
creep
resistance,
multimodal
viscoelastic
flow,
respectively,
attributable
nature
supramolecular
cross-links.
Additionally,
study
showcases
modulation
glass
transition
(
Язык: Английский
Cyclic polymers from alkynes: a review
Chemical Science,
Год журнала:
2024,
Номер
15(39), С. 16006 - 16014
Опубликована: Янв. 1, 2024
Cyclic
polymers
have
applications
across
various
fields,
including
material
science,
biomedicine,
and
inorganic
chemistry.
derived
from
alkyne
monomers
expanded
the
application
scope
to
include
electronic
materials
polyolefins.
This
review
highlights
recent
advancements
in
synthesis
of
cyclic
both
mono-
disubstituted
alkynes.
The
aim
is
provide
a
comprehensive
overview
synthetic
methodologies
Additionally,
this
will
facilitate
comparative
analysis
advantages
limitations
methods
describe
opportunities
for
future
development
novel
catalytic
systems
synthesize
Язык: Английский
A general synthesis of cyclic bottlebrush polymers with enhanced mechanical properties via graft-through ring expansion metathesis polymerization
Chemical Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
Cyclic
bottlebrush
polymers
combine
the
promise
of
densely-grafted
macromolecular
architectures
with
mechanical
advantages
cyclic
for
diverse
applications
across
materials
science.
Язык: Английский
Tethered Alkylidenes for REMP from Carbon Disulfide Cleavage
Inorganic Chemistry,
Год журнала:
2024,
Номер
63(26), С. 12207 - 12217
Опубликована: Июнь 18, 2024
Reactions
between
tungsten
alkylidyne
[
Язык: Английский
Ultra-high stretchability and shape fixation rate shape memory polyurethanes based on cyclic polytetrahydrofuran molecular rings
Polymer,
Год журнала:
2024,
Номер
311, С. 127578 - 127578
Опубликована: Сен. 3, 2024
Язык: Английский
Importance of Ligand Fine-Tuning: Alkyne Metathesis with Molybdenum Alkylidyne Complexes Supported by Phenyl-tert-butoxysilanolate Ligands
Organometallics,
Год журнала:
2024,
Номер
44(1), С. 255 - 267
Опубликована: Дек. 18, 2024
The
phenyl-tert-butoxysilanols
Ph(tBuO)2SiOH
and
Ph2(tBuO)SiOH
were
prepared
used
for
the
synthesis
of
molybdenum
2,4,6-trimethylbenzylidyne
complexes
[MesC≡Mo{OSi(OtBu)2Ph}3]
(1)
[MesC≡Mo{OSi(OtBu)Ph2}3]
(2)
from
mer-[MesC≡MoBr3(dme)]
(dme
=
dimethoxyethane,
Mes
2,4,6-trimethylphenyl).
molecular
structures
1
2
determined
by
X-ray
diffraction
analysis,
revealing
a
secondary
molybdenum–oxygen
interaction
chelating
κ2O,O′
coordination
mode
one
siloxide
ligands
in
case
1.
Treatment
with
an
excess
3-hexyne
(EtC≡CEt)
afforded
corresponding
propylidyne
(EtC≡Mo)
complexes,
which
are
equilibrium
labile
metallacyclobutadiene
as
evidenced
variable-temperature
NMR
spectroscopy.
Single
crystals
[(Et3C3)Mo{OSi(OtBu)Ph2}3]
(2-MCBD)
have
been
isolated
at
low
temperature,
providing
rare
example
crystallographically
characterized
molybdenacyclobutadiene.
alkylidyne
(n
1)
2)
complete
series
available
alkyne
metathesis
(pre-)catalysts
[RC≡Mo{OSi(OtBu)3–nPhn}3]
0–3),
their
catalytic
performance
internal
terminal
alkynes
was
investigated
compared,
if
available,
previous
members
this
0,
3).
Язык: Английский