Journal of Applied Polymer Science,
Год журнала:
2024,
Номер
141(43)
Опубликована: Авг. 17, 2024
Abstract
A
CO
2
‐based
thermoplastic
elastomer,
poly(propylene
carbonate)‐multiblock‐polyamide6
(PPC‐
mb
‐PA6)
copolymer,
was
constructed
through
coupling
amorphous/soft
PPC
blocks
with
crystalline/hard
PA6
blocks.
The
PPC‐
‐PA6
copolymers
different
block
length
pairs
were
designed
and
synthesized,
then
fully
characterized
by
structural,
thermal,
mechanical
analysis.
proton
nuclear
magnetic
resonance
(
1
H‐NMR),
diffusion
ordered
spectroscopy
(DOSY),
heteronuclear
multiple‐bond
correlation
(HMBC)
gel
permeation
chromatography
(GPC)
results
confirm
that
the
multiblock
sequence
structure
of
‐PA6.
differential
scanning
calorimetry
(DSC)
tests
show
all
PPC‐mb‐PA6s
possess
melting
points
around
179–206°C.
thermal
analysis
indicates
improved
service
temperatures
T
5%
up
to
270°C)
tensile
strength
ranging
from
15.8
39.6
MPa
higher
content.
dynamic
demonstrates
excellent
shape
memory
effect
stimuli
responsiveness
derived
micro
phase
separation
between
soft
hard
domains.
And
characteristic
strain
fixity
parameter
R
f
)
deformation
recovery
rate
r
are
98%
100%,
respectively,
which
comparable
other
polymers.
Inorganic Chemistry,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 21, 2024
Applying
the
mixed-linker
strategy
in
synthesizing
metal-organic
frameworks
(MOFs)
has
drawn
considerable
attention
as
a
heterogeneous
catalyst
owing
to
their
easy
synthesis
and
different
functional
ligands
frameworks.
Following
this
strategy,
we
have
developed
mixed
linker
Zr(IV)-based
MOF,
[Zr
Using
carbon
dioxide
(CO2)
to
make
recyclable
thermoplastics
could
reduce
greenhouse
gas
emissions
associated
with
polymer
manufacturing.
CO2/cyclic
epoxide
ring-opening
copolymerization
(ROCOP)
allows
for
>30
wt%
of
the
polycarbonate
derive
from
CO2;
so
far,
field
has
largely
focused
on
oligocarbonates.
In
contrast,
efficient
catalysts
high
molar
mass
polycarbonates
are
under-investigated
and
resulting
thermoplastic
structure-property
relationships,
processing
recycling
need
be
elucidated.
This
work
describes
a
new
organometallic
Mg(II)Co(II)
catalyst
that
combines
productivity,
low
loading
tolerance,
highest
polymerization
control
yields
Mn
values
4-130
kg
mol-1,
narrow,
monomodal
distributions.
It
is
used
in
ROCOP
CO2
bicyclic
epoxides
produce
series
samples,
each
Mn>100
poly(cyclohexene
carbonate)
(PCHC),
poly(vinyl-cyclohexene
(PvCHC),
poly(ethyl-cyclohexene
(PeCHC,
by
hydrogenation
PvCHC)
poly(cyclopentene
(PCPC).
All
these
materials
amorphous
thermoplastics,
glass
transition
temperatures
(85
<
Tg
126
°C,
DSC)
thermal
stability
(Td
>
260
°C).
The
cyclic
ring
substituents
mediate
materials’
chain
entanglements,
viscosity,
temperatures.
Specifically,
PCPC
was
found
have
10x
lower
entanglement
100x
zero-shear
viscosity
compared
PCHC,
showing
potential
as
future
thermoplastic.
molecular
weight
polymers
fully
recyclable,
either
re-processing
or
using
highly
selective
depolymerizations
CO2.
shows
fastest
depolymerization
rates,
achieving
an
activity
2500
h-1
>99%
selectivity
cyclopentene
oxide
Journal of CO2 Utilization,
Год журнала:
2024,
Номер
83, С. 102795 - 102795
Опубликована: Май 1, 2024
In
this
manuscript,
we
describe
the
synthesis
of
low
molar
mass
polycarbonate
diols
by
acid
cleavage
labile
acetal
linkages
included
in
high
poly(ether-co-carbonate-co-acetal)
terpolymers.
These
copolymers
were
prepared
terpolymerization
propylene
oxide
(PO)
with
o-phthalaldehyde
(OPA)
and
carbon
dioxide
(CO2),
using
triethyl
borane
(TEB)
as
activator
an
onium
salt
initiator.
The
advantage
strategy
poly(propylene
carbonate)
(PPC-diols)
lies
minute
amounts
TEB
initiator
required.
Moreover,
OPA
could
be
isolated
through
post-hydrolysis
terpolymers
recycled
for
subsequent
use.
We
also
demonstrated
that
works
poly(ethylene
(PEC-diols).
structural
integrity
before
after
treatment,
characterization
PPC-diols,
recycling
process
carried
out
1H
NMR
spectroscopy,
gel
permeation
chromatography,
matrix-assisted
laser
desorption
ionization
time
flight
(MALDI-TOF)
MS.
Journal of Applied Polymer Science,
Год журнала:
2024,
Номер
141(43)
Опубликована: Авг. 17, 2024
Abstract
A
CO
2
‐based
thermoplastic
elastomer,
poly(propylene
carbonate)‐multiblock‐polyamide6
(PPC‐
mb
‐PA6)
copolymer,
was
constructed
through
coupling
amorphous/soft
PPC
blocks
with
crystalline/hard
PA6
blocks.
The
PPC‐
‐PA6
copolymers
different
block
length
pairs
were
designed
and
synthesized,
then
fully
characterized
by
structural,
thermal,
mechanical
analysis.
proton
nuclear
magnetic
resonance
(
1
H‐NMR),
diffusion
ordered
spectroscopy
(DOSY),
heteronuclear
multiple‐bond
correlation
(HMBC)
gel
permeation
chromatography
(GPC)
results
confirm
that
the
multiblock
sequence
structure
of
‐PA6.
differential
scanning
calorimetry
(DSC)
tests
show
all
PPC‐mb‐PA6s
possess
melting
points
around
179–206°C.
thermal
analysis
indicates
improved
service
temperatures
T
5%
up
to
270°C)
tensile
strength
ranging
from
15.8
39.6
MPa
higher
content.
dynamic
demonstrates
excellent
shape
memory
effect
stimuli
responsiveness
derived
micro
phase
separation
between
soft
hard
domains.
And
characteristic
strain
fixity
parameter
R
f
)
deformation
recovery
rate
r
are
98%
100%,
respectively,
which
comparable
other
polymers.
