ACS Macro Letters,
Год журнала:
2023,
Номер
12(12), С. 1692 - 1697
Опубликована: Дек. 1, 2023
Here,
we
present
a
facile
and
robust
method
for
living
cationic
polymerization
using
zinc
wire
as
catalyst
precursor.
Well-defined
poly(vinyl
ether)s
with
various
molecular
weights
narrow
weight
distributions
(Đ
<
1.10)
can
be
achieved
at
room
temperature.
Excellent
characteristics
were
observed
in
kinetic
chain
extension
experiments.
Mechanistic
investigations
revealed
that
the
was
catalyzed
by
situ
generation
of
trace
ions,
which
is
key
to
under
mild
conditions.
The
utilization
offers
several
advantages,
including
reusability,
easy
separation
low
metal
residue.
Furthermore,
extended
application
this
continuous
flow
polymerization,
opening
up
promising
avenue
scalable
efficient
industrial
production
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(8), С. 5056 - 5062
Опубликована: Фев. 12, 2024
Cyclic
ketene
acetals
(CKAs)
are
among
the
most
well-studied
monomers
for
radical
ring-opening
polymerization
(rROP).
However,
ring-retaining
side
reactions
and
low
reactivities
in
homopolymerization
copolymerization
remain
significant
challenges
existing
CKAs.
Here,
we
report
that
a
class
of
monosaccharide
CKAs
can
be
facilely
prepared
from
short
scalable
synthetic
route
undergo
quantitative,
regiospecific,
stereoselective
rROP.
NMR
analyses
degradation
experiments
revealed
reaction
mechanism
involving
propagating
at
C2
position
pyranose
with
different
monosaccharides
exhibiting
distinct
stereoselectivity
addition
monomer.
Furthermore,
maleimide
was
found
to
improve
incorporation
efficiency
CKA
vinyl
produced
unique
degradable
terpolymers
carbohydrate
motifs
polymer
backbone.
ACS Polymers Au,
Год журнала:
2024,
Номер
4(3), С. 189 - 207
Опубликована: Фев. 29, 2024
In
recent
times,
the
evolution
of
cationic
polymerization
has
taken
a
multidirectional
approach,
with
development
reversible
addition-fragmentation
chain
transfer
(RAFT)
polymerization.
contrast
to
conventional
methods,
which
were
typically
carried
out
under
inert
atmospheres
and
low
temperatures,
various
novel
techniques
have
been
developed
where
reactions
are
in
open
air,
operate
at
room
temperature,
cost-effective,
environmentally
friendly.
Besides,
several
external
stimuli,
such
as
heat,
light,
chemicals,
electrical
potential,
etc.
employed
activate
control
process.
It
also
enables
combination
other
methods
single
reaction
vessel,
eliminating
necessity
for
isolation
purification
during
intermediate
steps.
addition,
significant
advancements
made
through
modifications
catalyst
systems,
resulting
polymers
an
exceptionally
high
level
stereoregularity.
This
review
article
comprehensively
analyses
developments
polymerization,
encompassing
their
applications
offering
insights
into
future
perspectives.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(12), С. 7963 - 7970
Опубликована: Март 14, 2024
Cellulose
serves
as
a
sustainable
biomaterial
for
wide
range
of
applications
in
biotechnology
and
materials
science.
While
chemical
enzymatic
glycan
assembly
methods
have
been
developed
to
access
modest
quantities
synthetic
cellulose
structure-property
studies,
polymerization
strategies
scalable
well-controlled
syntheses
remain
underdeveloped.
Here,
we
report
the
synthesis
precision
via
living
cationic
ring-opening
(CROP)
glucose
1,2,4-orthopivalates.
In
presence
dibutyl
phosphate
an
initiator
triflic
acid
catalyst,
with
molecular
weights,
defined
chain-end
groups,
excellent
regio-
stereospecificity
was
readily
prepared.
We
further
demonstrated
utility
this
method
through
native
d-cellulose
rare
l-cellulose.
