Journal of Applied Polymer Science,
Journal Year:
2024,
Volume and Issue:
141(43)
Published: Aug. 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.
ACS Applied Materials & Interfaces,
Journal Year:
2025,
Volume and Issue:
17(9), P. 14615 - 14622
Published: Feb. 19, 2025
Shape
memory
polyimide
aerogels
with
lightweight,
high-temperature
resistance,
and
excellent
shape
performance
are
ideal
materials
for
intelligent
structural
components
of
aerospace.
However,
their
low
recovery
stress
has
been
a
significant
barrier
to
practical
use,
particularly
in
driving
deformations.
Herein,
we
have
prepared
4D
printed
polyimide/polyimide
nanofiber
(PI/PIF)
composite
aerogel
high
load
at
temperatures.
The
PIF
enhances
ink
printability
mechanical
properties,
allowing
the
design
PI/PIF
double-curve
macrostructures
by
3D
printing
technology.
During
programming
process,
can
absorb
elastic
strain
energy
enhance
stress.
Consequently,
exhibit
density
(0.09
g
cm-3)
specific
(2.8
N
mm
kg-1)
drive
deformation
10
times
own
weight.
proposed
is
expected
expand
application
lightweight
Polymer Composites,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 12, 2025
Abstract
Four‐dimensional
(4D)
printing,
as
a
revolutionary
additive
manufacturing
technology,
is
receiving
increasing
attention
and
research
nowadays.
Further,
the
combination
of
4D
printing
continuous
fiber‐reinforced
polymer
composites
(CFRPCs)
has
provided
new
ideas
for
designing
composite
structures
with
customized
functions.
Herein,
systematic
analysis
status
printed
CFRPCs
presented.
Smart
materials
such
shape
memory
polymers
(SMPs)
can
be
utilized
to
manufacture
achieve
change
over
time.
Firstly,
mechanism
SMPs
analyzed,
process
introduced.
Furthermore,
matrix,
fiber
reinforcements,
actuation
methods
are
classified
elaborated.
Subsequently,
various
CFRPCs,
including
honeycomb
structures,
auxetic
active
origami,
summarized.
Moreover,
application
prospects
technology
in
different
fields
discussed.
Finally,
an
outlook
on
future
development
directions
provided.
Highlights
The
Different
kinds
classified.
An
Advanced Intelligent Systems,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 1, 2025
4D
printing
with
carbon
nanotube
(CNT)‐reinforced
polymers
enables
advanced
shape‐changing
materials
but
faces
challenges
in
CNT
dispersion
and
performance.
This
study
addresses
these
limitations
by
functionalizing
CNTs
polyethylene
glycol
(PEG),
significantly
enhancing
interfacial
bonding
within
biocompatible
polyvinyl
chloride
(PVC)‐polycaprolactone
(PCL)
composites.
The
composites,
tailored
for
biomedical
applications
a
glass
transition
temperature
(T
g
)
of
37–41
°C,
exhibit
enhanced
mechanical,
thermal,
shape‐memory
properties.
At
0.5
wt%
CNT,
the
composite
achieves
25%
increase
tensile
strength,
95.78%
shape
fixity,
5‐s
recovery
time,
offering
an
optimal
balance
flexibility,
rapid
recovery.
Higher
concentrations
(5
wt%)
further
improve
thermal
stability,
increasing
decomposition
20
°C
storage
modulus
670
MPa,
although
ductility
is
reduced.
PEG
grafting
prevents
agglomeration,
enabling
high
filler
loading
without
compromising
printability,
as
confirmed
through
uniform
nanoparticle
defect‐free
fused
deposition
modeling
(FDM)‐printed
structures.
These
intelligent
composites
combine
biocompatibility,
durability,
excellent
performance,
making
them
suitable
diverse
structural
applications,
such
adaptive
medical
devices,
ergonomic
shoe
soles,
wearable
biosensors.
novel
material
provides
versatile
platform
high‐performance,
4D‐printed
systems
that
address
current
polymer
nanocomposites
advance
engineering
innovations.
Journal of Applied Polymer Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 5, 2025
ABSTRACT
Polyethylene
(PE)
is
one
of
the
most
widely
used
commodity
plastics,
yet
its
integration
into
pioneering
field
polymer‐based
3D
and
4D
printing
remains
challenging.
Conversely,
polyethylene
terephthalate
glycol
(PETG)
a
utilized
material
in
printing,
capable
mitigating
limitations
PE
these
applications
through
blending.
Herein,
three
weight
percentages
15,
30,
45
wt%
PETG
were
added
to
low‐density
(LDPE),
printed
samples
subjected
comprehensive
evaluation
mechanical
properties,
morphology,
thermal
analysis,
shape
memory
properties.
The
results
dynamic
analysis
(DMTA)
revealed
noticeable
peak
tan
δ
around
80°C,
which
becomes
more
pronounced
blends
with
higher
content.
Scanning
electron
microscopy
(SEM)
showed
that
increasing
concentration
3D‐printed
LDPE/PETG
transforms
their
morphology
from
distinct,
void‐rich
phases
at
15
improved
dispersion
30
PETG,
finally
co‐continuous,
strongly
adhered
structure
indicating
enhanced
compatibility.
Tensile
testing
demonstrated
shift
ductile
brittle
behavior
as
content
increased.
Shape
indicated
concentrations
improve
recovery
performance,
achieving
highest
ratio
(88.7%)
showing
lowest
(68.7%).
These
represent
significant
step
toward
incorporating
LDPE
commercial
materials.
