Thermoresponsive helical dendronized poly(arylacetylene)s: modulating the dynamic chirality
Science China Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 2, 2025
Язык: Английский
Recent Advances in the Synthesis of Substituted Polyacetylenes
Catalysts,
Год журнала:
2025,
Номер
15(1), С. 50 - 50
Опубликована: Янв. 8, 2025
Recent
developments
in
the
synthesis
of
substituted
polyacetylenes
have
considerably
benefitted
from
advancements
organometallic
catalysis;
however,
most
important
rely
on
advent
Rh-catalyzed
living
polymerizations.
The
latter
not
only
allow
tailoring
well-defined
degrees
polymerization
with
low
and
narrow
polydispersity
but
also
enable
access
to
stereochemical
cis-transoidal
polymers
a
helical
structure.
These
novel
open
new
avenues
for
application
photonics
electronics.
polymerizations
are
mild
concise
metal-catalyzed
polymer
syntheses
that
decoration
sidechains
multiple
functionalities,
including
chiral
units,
enantioselective
induction
chirality,
memory
copolymerization,
end-group
functionalization
at
both
termini.
This
review
summarizes
recent
polyacetylenes,
special
focus
Язык: Английский
Light-induced twisting, untwisting, and retwisting of aromatic polyamides: an interplay between the induced chirality and the co-facial π-stacking interactions
Chemical Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
This
functionalized
aromatic
polyamide
dynamically
switches
between
two
ordered
structures
(helix
and
pleated
sheet).
A
photoresponsive
merocyanine
acts
as
a
conformational
switch
for
its
secondary
structure.
Язык: Английский
Hierarchical assembly of thermoresponsive helical dendronized poly(phenylacetylene)s through photo-crosslinking of the thermal aggregates
Journal of Colloid and Interface Science,
Год журнала:
2024,
Номер
677, С. 928 - 940
Опубликована: Авг. 5, 2024
Язык: Английский
Thermo/pH-Responsive Multiamide-Functionalized Y-Junction-Bearing Polyacrylamides with Substituent-Dependent Thermal Reversibility
Macromolecules,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 27, 2024
Chain
architecture
and
chemical
composition
of
polymers
can
play
vital
roles
in
regulating
thermoresponsive
properties.
Despite
tremendous
progress,
it
remains
difficult
to
achieve
LCST/upper
critical
solution
temperature
(LCST/UCST)
behavior
with
tunable
thermal
hysteresis
outstripping.
This
study
affords
a
promising
strategy
an
integrated
multiamide
specific
substituents
address
the
challenge.
The
incorporation
two
involving
isopropyl,
2-diethylaminoethyl,
or
carbamoylmethyl
into
each
Y
junction
multiamide-functionalized
Y-junction-bearing
(MAYJPs)
allows
enhancing
polymer–polymer
interactions.
disruption
intrinsic
balances
among
hydrogen
bonding,
electrostatic
interactions,
hydrophilic-to-hydrophobic
ratio
renders
multitunable
phase
transition.
location
switching
heterosubstituents
result
either
inverse
transition
significantly
different
temperature.
thermodynamic
dynamic
control
over
hydration
status
subunits
leads
occurrence
four
kinds
reversibility
slight
significant
hysteresis,
consecutive
outstripping
pronounced
upon
heating–cooling
cycles.
solvent
isotope
effect
results
distinct
type
transition,
pH
is
reflected
pH-induced
increase,
decrease,
V-shaped
evolution
In
addition,
accompany
morphology
transformation
spheres,
vesicles,
nanotubes,
lamellae.
These
fundamental
findings
are
beneficial
for
gaining
insights
multiamide-related
reversibility.
Owing
diversity
substituents,
MAYJPs
may
serve
as
multipurpose
applications.
Язык: Английский
Rh(I) Catalyzed Polymerization of Propargylated Monosaccharides to Electrospinable Helically Chiral Linear Polyacetylenes and Sorption‐Active Porous Polyacetylene Networks
Journal of Polymer Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 8, 2024
ABSTRACT
We
report
the
Rh(I)‐catalyzed
chain‐growth
polymerizations
of
propargylated
monosaccharides
to
form
π‐conjugated
polyacetylene‐type
products
with
monosaccharide
substituents
attached
polyacetylene
backbone
via
short
methylene
spacers.
The
homopolymerization
provides
helically
chiral
linear
polyacetylenes
M
w
~
20,000
soluble
in
either
water
(monosaccharide
free
OH
groups)
or
organic
solvents
(acetylated
substituents).
methodology
is
established
for
transformation
prepared
polymers
into
fibers
(average
diameter
~2.7
μm)
taking
advantage
electrospinning
technique.
Copolymerization
1,3,5‐triethynylbenzene
cross‐linker
hyper‐cross‐linked
networks
units
content
up
46
wt.%,
permanent
micro/mesoporosity
and
S
BET
area
482
m
2
g
−1
.
serve
as
centers
active
reversible
isothermal
adsorption
vapor
from
air.
achieved
H
O
capture
capacity
200
mg
(298
K,
RH
=
90%)
shows
promising
(co)building
blocks
construction
porous
materials
effective
harvesting
Язык: Английский