Journal of the mechanical behavior of biomedical materials/Journal of mechanical behavior of biomedical materials,
Год журнала:
2024,
Номер
153, С. 106507 - 106507
Опубликована: Март 13, 2024
Polyolefins
exhibit
robust
mechanical
and
chemical
properties
can
be
applied
in
the
medical
field,
e.g.
for
manufacturing
of
dentures.
Despite
their
wide
range
applications,
they
are
rarely
used
extrusion-based
printing
due
to
warpage
tendency.
The
aim
this
study
was
investigate
reduce
polyolefins
compared
commonly
filaments
after
additive
(AM)
sterilization
using
finite
element
simulation.
Three
types
were
investigated:
a
medical-grade
polypropylene
(PP),
glass-fiber
reinforced
(PP-GF),
biocopolyester
(BE)
filament,
an
acrylic
resin
(AR)
material
jetting.
Square
specimens,
standardized
samples
prone
warpage,
denture
bases
(n
=
10
each
group),
as
clinically
relevant
anatomically
shaped
reference,
digitized
AM
steam
(134
°C).
To
determine
volume
underneath
square
specimens
calculated,
while
deviations
from
file
measured
root
mean
(RMS)
values.
PP
base,
simulation
based
on
thermomechanical
calculations
performed.
Statistical
analysis
conducted
Kruskal-Wallis
test,
followed
by
Dunn's
test
multiple
comparisons.
results
showed
that
exhibited
greatest
AM,
PP-GF,
BE,
AR
minimal
before
sterilization.
However,
increased
BE
during
sterilization,
whereas
remained
more
stable.
After
made
highest
warpage.
Through
simulation-based
optimization,
base
successfully
reduced
25%.
In
contrast
reference
materials,
demonstrated
greater
dimensional
stability
making
it
potential
alternative
applications.
Nevertheless,
reducing
cooling
process
remains
necessary,
optimization
holds
promise
addressing
issue.
Abstract
The
development
of
efficient
and
sustainable
composites
remains
a
primary
objective
both
research
industry.
In
this
study,
the
use
biochar,
an
eco-friendly
reinforcing
material,
in
additive
manufacturing
(AM)
is
investigated.
A
high-density
Polyethylene
(HDPE)
thermoplastic
was
used
as
matrix,
material
extrusion
(MEX)
technique
applied
for
composite
production.
Biochar
produced
from
olive
tree
prunings
via
conventional
pyrolysis
at
500
°C.
Composite
samples
were
created
using
biochar
loadings
range
2.0–10.0
wt.
%.
3D-printed
mechanically
tested
accordance
with
international
standards.
Thermogravimetric
analysis
(TGA)
Raman
spectroscopy
to
evaluate
thermal
structural
properties
composites.
Scanning
electron
microscopy
examine
fractographic
morphological
characteristics
materials.
electrical/dielectric
HDPE/biochar
studied
over
broad
frequency
(10
–2
Hz–4
MHz)
room
temperature.
Overall,
laborious
effort
12
different
tests
implemented
fully
characterize
developed
investigate
correlations
between
qualities.
This
investigation
demonstrated
that
MEX
process
can
be
satisfactory
reinforcement
agent.
Notably,
compared
control
pure
HDPE,
increased
tensile
strength
by
20%
flexural
35.9%
when
added
loading
4.0
impact
microhardness
also
significantly
improved.
Furthermore,
Direct
current
(DC)
conductivity
insulating
HDPE
five
orders
magnitude
8.0
%
content,
suggesting
percolation
threshold.
These
results
highlight
potential
C-based
further
exploit
their
applicability
providing
parts
improved
mechanical
performance
profiles.
Graphical
Defence Technology,
Год журнала:
2024,
Номер
38, С. 16 - 32
Опубликована: Март 29, 2024
In
this
study,
we
investigated
the
performance
improvement
caused
by
addition
of
copper
(Cu)
nanoparticles
to
high-density
polyethylene
(HDPE)
matrix
material.
Composite
materials,
with
filler
percentages
0.0,
2.0,
4.0,
6.0,
8.0,
and
10.0
wt%
were
synthesized
through
material
extrusion
(MEX)
3D
printing
technique.
The
nanocomposite
filaments
utilized
for
manufacturing
specimens
suitable
experimental
procedure
that
followed.
Hence,
able
systematically
investigate
their
tensile,
flexural,
impact,
microhardness
properties
various
mechanical
tests
conducted
according
corresponding
standards.
Broadband
Dielectric
Spectroscopy
was
used
electrical/dielectric
composites.
Moreover,
employing
means
Raman
spectroscopy
thermogravimetric
analysis
(TGA)
also
further
vibrational,
structural,
thermal
properties.
Concomitantly,
scanning
electron
microscopy
(SEM),
as
well
atomic
force
(AFM),
examination
morphological
structural
characteristics
specimens,
while
energy-dispersive
X-ray
(EDS)
performed
in
order
receive
a
more
detailed
picture
on
nanomaterials
assessed
antibacterial
regarding
Staphylococcus
aureus
(S.
aureus)
Escherichia
coli
(E.
coli)
assistance
method
named
screening
agar
diffusion.
results
showed
HDPE
benefited
from
utilization
Cu
filler,
they
notable
improvement.
specimen
HDPE/Cu
4.0
one
presented
highest
levels
reinforcement
four
out
seven
tested
(for
example,
it
exhibited
36.7%
flexural
strength,
compared
pure
matrix).
At
same
time,
nanocomposites
efficient
against
S.
bacterium
less
E.
bacterium.
use
such
multi-functional,
robust
MEX
is
positively
impacting
applications
fields,
most
notably
defense
security
sectors.
latter
becomes
increasingly
important
if
takes
into
account
firearms
encompass
polymeric
parts
require
robustness
improved
properties,
at
time
keeping
risk
spreading
infectious
microorganisms
bare
minimum.
Colloid & Polymer Science,
Год журнала:
2024,
Номер
302(6), С. 843 - 860
Опубликована: Фев. 22, 2024
Abstract
By
enabling
the
development
of
complex
structures
with
adaptable
qualities,
techniques
for
additive
manufacturing
have
opened
new
routes
material
and
research.
In
this
research,
silicon
nitride
(Si
3
N
4
)
ceramic
nanoparticles
are
incorporated
into
polypropylene
(PP)
matrices.
Various
loading
levels
standardized
test
specimens
that
adhere
to
ASTM
criteria
created.
The
main
goal
is
thoroughly
characterize
these
composites
an
emphasis
on
their
mechanical
capabilities.
rheological,
thermomechanical,
morphological
properties
3D-printed
PP/Si
created
using
extrusion
(MEX)
3D
printing
examined.
Thermogravimetric
analysis
differential
scanning
calorimetry
exploited
study
thermal
stability
phase
transitions
in
composite
materials.
Mechanical
testing
conducted
determine
such
as
flexural
tensile
strength
modulus
elasticity.
For
detailed
characterization
nanocomposites,
electron
microscopy,
Raman
spectroscopy
also
performed.
results
provide
insight
impact
Si
properties,
stability,
rheological
behavior
composites.
2
wt%
filler
showed
overall
best
performance
improvement
(21%
elasticity,
15.7%
strength,
high
values
remaining
assessed).
nanocomposite
maximum
a
33.6%
increased
microhardness
than
pure
PP
thermoplastic,
showing
promising
wear
resistance
parts
built
it.
This
research
reveals
ability
improve
characteristics
PP-based
compounds
produced
by
MEX
printing.
Graphical
Journal of Composites Science,
Год журнала:
2024,
Номер
8(7), С. 247 - 247
Опубликована: Июнь 29, 2024
The
study
investigates
the
fabrication
and
analysis
of
nickel
microparticle-reinforced
composites
fabricated
using
digital
light
processing
(DLP)
technique.
A
slurry
is
prepared
by
incorporating
Ni-micro
particles
into
a
resin
vat;
it
thoroughly
mixed
to
achieve
homogeneity.
Turbidity
fluctuations
are
observed,
initially
peaking
at
50%
within
first
two
minutes
mixing
then
stabilizing
30%
after
15–60
min.
FTIR
spectroscopy
with
varying
Ni
wt.%
performed
alterations
in
composite
material’s
molecular
structure
bonding
environment.
Spectrophotometric
revealed
distinctive
transmittance
signatures
specific
wavelengths,
particularly
visible
spectrum,
notable
peak
532
nm.
effects
printing
orientation
X,
Y,
Z
axes
were
also
studied.
Mechanical
properties
computed
tensile
strength,
surface
roughness,
hardness.
results
indicate
substantial
enhancements
properties,
increases
75.5%
ultimate
strength
160%
maximum
strain.
Minimal
roughness
hardness
suggest
favorable
printability.
Microscopic
examination
characteristic
fracture
patterns
particulate
different
values
for
nickel.
findings
demonstrate
potential
DLP-fabricated
Ni-reinforced
applications
demanding
enhanced
mechanical
performance
while
maintaining
printability,
paving
way
further
exploration
this
domain.
