Chemistry - A European Journal,
Journal Year:
2023,
Volume and Issue:
29(68)
Published: Sept. 18, 2023
Developing
materials
to
harvest
water
from
the
air
is
of
great
importance
alleviate
shortage
for
people
living
in
arid
regions,
where
annual
average
relative
humidity
(RH)
lower
than
0.4.
In
this
work,
we
report
a
general
nitrogen
atom
incorporation
strategy
prepare
high-performance
covalent
organic
frameworks
(COFs)
harvesting
areas.
A
series
COFs,
namely
COF-W1,
COF-W2,
and
COF-W3
were
developed
purpose.
Different
contents
embedded
into
COFs
by
incorporating
pyridine
units
building
blocks.
With
increasing
content
COF-W1
COF-W3,
inflection
points
their
isotherms
shift
distinctly
RH
values
0.65
0.25.
Significantly,
exhibits
lowest
point
at
low
value
0.25
reaches
high
uptake
capacity
0.28
g
g-1
25
°C
with
hysteresis
loop.
Moreover,
gram-scale
retains
its
performance,
which
renders
it
more
attractive
harvesting.
This
work
demonstrates
feasibility
acquire
as
harvesters
future.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(46)
Published: Aug. 4, 2024
Poly(ethylene
terephthalate)
(PET)
is
an
important
polymer
with
annual
output
second
only
to
polyethylene.
Due
its
low
biodegradability,
a
large
amount
of
PET
recycled
for
sustainable
development.
However,
current
strategies
recycling
are
limited
by
added
value
or
small
product
scale.
It
urgent
make
breakthrough
on
the
principle
macromolecular
reaction
and
efficiently
prepare
products
high
wide
applications.
Here,
catalyst-
solvent-free
synthesis
biodegradable
plastics
reported
through
novel
carboxyl-ester
transesterification
between
waste
bio-based
hydrogenated
dimer
acid
(HDA),
which
can
directly
substitute
some
terephthalic
(TPA)
units
in
chain
HDA
unit.
This
be
facilely
carried
out
equipment
polyester
industry
without
any
additional
catalyst
solvent,
thus
enabling
low-cost
large-scale
production.
Furthermore,
semi-bio-based
copolyester
shows
excellent
mechanical
properties,
regulable
flexibility
good
expected
poly(butylene
adipate-co-terephthalate)
(PBAT)
plastic
as
value-added
materials.
work
provides
environmental-friendly
economic
strategy
upcycling
waste.
Journal of the American Chemical Society,
Journal Year:
2022,
Volume and Issue:
144(43), P. 19896 - 19909
Published: Oct. 18, 2022
Switchable
catalysis,
in
combination
with
epoxide-involved
ring-opening
(co)polymerization,
is
a
powerful
technique
that
can
be
used
to
synthesize
various
oxygen-rich
block
copolymers.
Despite
intense
research
this
field,
the
sequence-controlled
polymerization
from
epoxide
congeners
has
never
been
realized
due
their
similar
ring-strain
which
exerts
decisive
influence
on
reaction
process.
Recently,
quaternary
ammonium
(or
phosphonium)-containing
bifunctional
organoboron
catalysts
have
developed
by
our
group,
showing
high
efficiency
for
conversions.
Herein,
we,
first
time,
report
an
operationally
simple
pathway
access
well-defined
polyether-block-polycarbonate
copolymers
mixtures
of
epoxides
switchable
was
enabled
through
thermodynamically
and
kinetically
preferential
terminal
or
internal
under
different
atmospheres
(CO2
N2)
using
one
representative
catalyst.
This
strategy
shows
broad
substrate
scope
as
it
suitable
combinations
epoxides,
delivering
corresponding
NMR,
MALDI-TOF,
gel
permeation
chromatography
analyses
confirmed
successful
construction
Kinetic
studies
density
functional
theory
calculations
elucidate
reversible
selectivity
between
presence/absence
CO2.
Moreover,
replacing
comonomer
CO2
cyclic
anhydride,
polyether-block-polyester
also
synthesized.
work
provides
rare
example
mixtures,
broadening
arsenal
catalysis
produce
polymers
controlled
manner.
Journal of Materials Chemistry B,
Journal Year:
2022,
Volume and Issue:
11(2), P. 221 - 243
Published: Nov. 28, 2022
A
comprehensive
review
on
the
design,
characterization,
classification,
and
applications
of
strain-stiffening
hydrogels,
which
mimic
mechanical
response
biological
tissues.
Macromolecules,
Journal Year:
2023,
Volume and Issue:
56(13), P. 4901 - 4909
Published: June 26, 2023
The
development
of
metal-free
catalysts
with
excellent
activity
and
controllability
remains
a
significant
obstacle
for
the
copolymerization
CO2
epoxides.
In
this
study,
we
used
frustrated
Lewis
pair
(FLP)
composed
commercial
tertiary
phosphine
trialkylborane
to
catalyze
propylene
oxide
(PO).
rational
matching
electronic
steric
properties
bases
acids
has
great
influence
on
copolymerization.
FLP
PtBu3
BnBu3
exhibits
moderate
catalytic
(TOF
up
447
h–1)
high
initiation
efficiency
toward
PO
copolymerization,
in
which
possesses
strong
nucleophilicity
large
hindrance
while
medium
acidity
hindrance.
obtained
polycarbonates
had
well-defined
structures
carbonate
contents
96–99%,
tunable
molecular
weights
(8.0–19.9
kDa),
narrow
dispersities
(<1.1).
favorable
performance
confirms
that
catalysis
is
feasible
methodology
epoxide
ChemSusChem,
Journal Year:
2024,
Volume and Issue:
17(13)
Published: Feb. 19, 2024
Abstract
Despite
approximately
70
%
of
the
earth
being
covered
by
water,
water
shortage
has
emerged
as
an
urgent
social
challenge.
Sorbent‐based
atmospheric
harvesting
stands
out
a
potent
approach
to
alleviate
situation,
particularly
in
arid
regions.
This
method
requires
adsorbents
with
ample
working
capacity,
rapid
kinetics,
low
energy
costs,
and
long‐term
stability
under
operating
conditions.
Covalent
organic
frameworks
(COFs)
are
novel
class
crystalline
porous
materials
offer
distinct
advantages
due
their
high
specific
surface
area,
structural
diversity,
robustness.
These
properties
enable
rational
design
customization
water‐harvesting
capabilities.
Herein,
basic
concepts
about
sorption
process
within
COFs,
including
parameters
that
qualitatively
or
quantitatively
describe
isotherms
mechanism
summarized.
Then,
recent
methods
used
prepare
COFs‐based
harvesters
reviewed,
emphasizing
diversity
COFs
presenting
common
empirical
understandings
these
endeavors.
Finally,
challenges
research
proposed
help
develop
next‐generation
harvesters.
Chem & Bio Engineering,
Journal Year:
2024,
Volume and Issue:
1(4), P. 312 - 329
Published: April 18, 2024
With
inspiration
from
natural
systems,
various
soft
actuators
and
robots
have
been
explored
in
recent
years
with
versatile
applications
biomedical
engineering
fields.
Soft
active
materials
rich
stimulus-responsive
characteristics
an
ideal
candidate
to
devise
these
machines
by
using
different
manufacturing
technologies.
Among
technologies,
three-dimensional
(3D)
printing
shows
advantages
fabricating
constructs
multiple
sophisticated
architectures.
In
this
Review,
we
aim
provide
overview
of
progress
on
3D
materials,
robotics
performances,
representative
applications.
Typical
techniques
are
briefly
introduced,
followed
state-of-the-art
advances
hydrogels,
shape
memory
polymers,
liquid
crystalline
elastomers,
their
hybrids
as
robots.
From
the
perspective
material
properties,
commonly
used
action-generation
principles
for
typical
printed
discussed.
Actuation
locomotive
behaviors,
summarized.
The
relationship
between
structures
action
performances
is
also
Finally,
limitations
each
compared,
remaining
challenges
future
directions
field
prospected.
