Herein,
we
developed
a
new
diamine
monomer
termed
TA-BOC
that
features
tert-butoxycarbonyl
(t-Boc)
protected
group.
This
t-Boc
group
could
shield
one
of
the
reactive
amine
sites
present
in
commercial
tris(4-aminophenyl)amine
(TAPA)
monomer.
Then,
this
difunctional
analogue
is
employed
as
comonomer
alongside
TAPA
and
6FDA
to
regulate
cross-linking
density
polyimide
material
by
varying
molar
ratio
TA-BOC.
Moreover,
due
bulky
steric
hindrance
group,
attempted
remove
via
thermal
treatment
create
more
microporosity
within
membranes.
Therefore,
because
synergistic
effect
reduced
heat
treatment,
gas
separation
performance
prepared
membranes
greatly
improved.
Furthermore,
presence
trifunctional
network
structures
significantly
enhances
membrane's
resistance
plasticization.
For
instance,
6F-TA:TA-BOC(1:3)-450
has
high
CO2
permeability
865.3
Barrer
an
excellent
CO2/CH4
selectivity
41.8,
meanwhile
its
plasticization
pressures
exceeding
35
bar.
These
values
surpass
2008
Robeson
upper
bound,,
indicating
great
potential
for
efficient
processes.
We
expect
study
will
provide
perspectives
reasonable
design
possessing
enhanced
strong
resistance.
Advanced Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 11, 2024
Membranes
with
switchable
wettability,
solvent
resistance,
and
toughness
have
emerged
as
promising
materials
for
separation
applications.
However,
challenges
like
limited
mechanical
strength,
poor
chemical
stability,
structural
defects
during
membrane
fabrication
hinder
their
widespread
adoption.
Covalent
organic
frameworks
(COFs),
crystalline
constructed
from
molecules
connected
by
covalent
bonds,
offer
a
solution
due
to
high
porosity,
customizable
properties.
The
ordered
structures
functionality
provide
COFs
lightweight
framework,
large
surface
area,
tunable
pore
sizes,
which
attracted
increasing
attention
applications
in
separations.
Recent
research
has
extensively
explored
the
preparation
strategies
of
COF
membranes
various
processes.
This
review
uniquely
delves
into
influence
techniques,
including
interfacial
polymerization,
layer-by-layer
assembly,
situ
growth,
on
thickness
performance.
It
comprehensively
explores
design
potential
these
methods,
particular
focus
gas
separation,
oil/water
nanofiltration.
Furthermore,
future
opportunities,
within
this
field,
directions
development
are
proposed.
Journal of Materials Chemistry A,
Год журнала:
2024,
Номер
12(31), С. 19806 - 19838
Опубликована: Янв. 1, 2024
The
effects
of
pyrolysis
protocols
on
the
pore
structure
and
gas
separation
performance
PI-
PIM-derived
CMS
membranes
were
systematically
summarized
discussed,
research
progress
in
CO
2
olefin/paraffin
was
reviewed.
