Development of Lightweight, Recyclable, and Degradable Foams Based on an Environmentally Friendly Polyamide Elastomer System via Supercritical Carbon Dioxide Foaming
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
13(1), С. 494 - 506
Опубликована: Дек. 30, 2024
In
efforts
to
resolve
problems
of
depletion
earth's
resources
and
disposal
solid
waste
caused
by
traditional
petrochemical
polyamide
systems,
biobased
degradable
polyamides
their
foamed
products
have
received
considerable
attention.
However,
the
practical
development
such
sustainable
foamable
materials
is
still
challenging.
Herein,
we
designed
an
environmentally
friendly
elastomer
system
using
1010
(PA1010)
as
hard
segment
polycaprolactone
(PCL)
diol
soft
segment.
By
increasing
PCL
content,
melting
temperature
was
gradually
suppressed
from
205
173
°C,
stretchability
progressively
enhanced
18
770%.
Notably,
elastomers
with
high
contents
were
beneficial
production
lightweight
foams
expansion
ratios
higher
than
3.8
via
supercritical
carbon
dioxide
(CO2)
foaming,
effectively
overcoming
major
difficulties
in
manufacturing
intrinsic
issues
crystallinity,
low
extensibility,
insufficient
melt
strength.
Moreover,
controlling
content
at
optimal
value
37
wt
%
allowed
achieve
a
good
balance
between
foaming
performance
shrinkage
resistance.
Additionally,
could
be
easily
recycled
remanufactured
form
renewed
foam
because
no
reactive
cross-linkers
or
chemical
blowing
agents
used.
The
compressive
stress
restored
least
70%
original
level.
Furthermore,
gave
favorable
degradability.
sample
highest
showed
mass
loss
approximately
24.65%
after
12
weeks
alkaline
medium.
Such
effective
degradability
conducive
resolving
accumulation
landfilling
greenhouse
gas
emissions
incineration.
We
believe
that
these
findings
provide
constructive
way
design
advanced
materials.
Язык: Английский
An Advanced Surface Treatment Technique for Coating Three-Dimensional-Printed Polyamide 12 by Hydroxyapatite
Coatings,
Год журнала:
2024,
Номер
14(9), С. 1181 - 1181
Опубликована: Сен. 12, 2024
Polymer
3D
printing
has
is
used
in
a
wide
range
of
applications
the
medical
field.
Polyamide
12
(PA12)
versatile
synthetic
polymer
that
been
to
reconstruct
bony
defects.
Coating
its
surface
with
calcium
phosphate
compounds,
such
as
hydroxyapatite
(HA),
could
enhance
bonding
bone.
The
aim
this
study
was
coat
3D-printed
polyamide
specimens
by
simple
innovative
treatment
using
light-cured
resin
cement.
powder
printed
selective
laser
sintering
produce
80
disc-shaped
(15
mm
diameter
×
1.5
thickness).
were
divided
randomly
into
two
main
groups:
(1)
control
group
(untreated),
where
left
without
any
modifications;
(2)
treated
group,
coated
new
method
dental
characterised
both
Fourier
transform
infrared
spectroscopy
(FTIR)
and
Transmission
Electron
Microscopy
(TEM),
(n
=
10/test).
groups
further
subdivided
subgroups
according
immersion
phosphate-buffered
saline
(PBS).
first
subgroup
not
immersed
PBS
3D-printed,
while
second
for
15
days
10/subgroup).
surfaces
examined
an
environmental
scanning
electron
microscope
(SEM)
energy
dispersive
X-ray
analysis
(EDXA)
before
after
PBS.
Following
standard
American
Society
Testing
Materials
(ASTM
D3359),
cross-cut
adhesion
test
performed.
results
FTIR
confirmed
HA
bands.
TEM
micrograph
revealed
agglomerated
particles
coat.
SEM
micrographs
illustrated
sintered
minimal
porosity.
Their
EDXA
presence
carbon,
nitrogen,
oxygen
atomic%:
52.1,
23.8,
24.1
respectively.
After
PBS,
there
no
major
changes
detected
EDXA.
microstructure
showed
deposited
clusters
phosphorus
on
surface,
addition
oxygen,
9.5,
5.9,
7.2,
30.9,
46.5,
This
stable
immersion,
observed
demonstrated
just
few
loose
coating
flakes
(area
removed
<5%)
HA-coated
specimens.
It
be
concluded
Язык: Английский
Improved Foaming Performance of Thermoplastic Polyether Amide Elastomers via Chain Extension: Toward Self‐Powered Intelligent Footwear
Advanced Engineering Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 12, 2025
Thermoplastic
polyamide
elastomers
(TPAEs)
with
6
(PA6)
as
hard
segments
and
polyether
amine
soft
are
successfully
synthesized
by
one‐pot
melt
polycondensation,
in
which
the
tensile
strength
elongation‐at‐break
of
resulting
TPAE
segment
content
43
wt%
reached
(27.54
±
0.92)
MPa
(508.10
19.81)%,
respectively.
Subsequently,
two
different
types
chain
extenders
Joncryl
ADR
4468
((ADR)/Hexamethylene
Diisocyanate
(HDI)
trimer)
applied
to
enhance
molecular
entanglement
TPAEs.
It
is
found
that
showed
a
better
extension
effect,
TPAEs
improved
significantly
when
5
wt%,
corresponding
foam
possessed
outstanding
compressive
resilience
stability.
Based
on
excellent
compression
property,
contact‐separated
triboelectric
nanogenerator
assembled
friction
layer,
demonstrated
high
open‐circuit
voltage
20.4
V,
short‐circuit
current
0.74
μA,
power
density
0.18
W
m
−2
,
durability.
Overall,
prepared
foams
provided
an
avenue
for
high‐performance
self‐powered
intelligent
footwear
materials.
Язык: Английский
Novel preparation and characterization of PA12/DMAc microspheres for selective laser sintering
Polymer Engineering and Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 17, 2025
Abstract
A
novel
approach
to
investigate
the
processability
of
polyamide
12/dimethylacetamide
(PA12/DMAc)
microspheres
for
laser
sintering
through
molecular
interactions
functional
groups
and
effects
DMAc
on
morphology,
particle
size
distribution,
thermal
properties
polymer
composites
was
addressed
in
this
study.
The
increase
concentrations
enhanced
dissolution,
minimized
agglomeration,
improved
binding
adhesive
forces
within
matrix.
It
also
stretching
vibrations
primary
amide
(C=N),
amine
bond
(C–N),
hydrogen
(N–H)
PA12.
melting
enthalpy
powder
increased
with
greater
solvent.
All
PA12
samples
exhibited
a
consistent
average
crystallization
point
147.5°C,
similar
that
virgin
(149.3°C)
due
identical
exothermic
properties.
SEM
distribution
analysis
PA12/DMAc
indicated
variability
interspaces
between
particles
differences
interfacial
mobility,
which
expanded
an
solvent
input
ratios.
However,
span
reduced
volume
DMAc.
optimal
mean
64.87
μm,
accompanied
by
bulk
density
0.38
g/cm
3
,
could
facilitate
sinterability
powder.
Highlights
Compatibility
Molecular
during
TIPS
Effects
dissolution
precipitation
time
Dissolution
rate
Melting
behavior.
Язык: Английский
Mathematical modeling and optimization of PA12 enthalpy and particle size distribution for efficient TIPS process powder production
Materials Today Communications,
Год журнала:
2025,
Номер
46, С. 112680 - 112680
Опубликована: Апрель 29, 2025
Язык: Английский
Efficient Use of Secondary Raw Material from the Production of Polyamide Construction Products
Processes,
Год журнала:
2024,
Номер
12(7), С. 1304 - 1304
Опубликована: Июнь 23, 2024
This
study
aimed
to
assess
the
possibility
of
using
post-production
waste
and
impact
conditioning
method
on
mechanical
thermomechanical
properties
polyamide
injection
molded
parts.
Samples
containing
5,
10,
15
wt.%
ground
were
produced
molding
technology.
The
rheological
by
oscillatory
rheometry,
melt
mass
flow
rate
(MFR),
thermal
stability
thermogravimetric
analysis
(TGA)
polymer
mixtures
recycled
fraction
determined.
samples
conditioned
under
following
conditions:
24
h
14
days
in
distilled
water,
a
climatic
chamber,
aged
xenon-light-accelerated
aging
chamber.
Then,
static
tensile
strength
heat
deflection
temperature
(HDT)
assessed.
results
show
that
addition
form
grinding
does
not
significantly
affect
finished
products.
research
provides
valuable
information
regarding
secondary
materials
for
manufacturing
high-performance
construction
Moreover,
it
was
proven
process
chamber
most
effective
increased
tested
material.
Язык: Английский