Polymers for Advanced Technologies,
Journal Year:
2024,
Volume and Issue:
35(11)
Published: Oct. 30, 2024
ABSTRACT
This
paper
investigates
the
effect
of
short‐time
water
immersion
(WI)
and
heat‐treatment
(HT)
post‐processes
on
mechanical
properties
joint
strength
printed
polylactic
acid
(PLA)
parts
with
various
raster
angles.
Using
these
post‐processing
methods
to
enhance
PLA
could
be
deemed
as
novelty
contribution
current
study.
The
WI
HT
tensile
test
specimens
adherends
bonded
joints
were
carried
out
at
21°C
90°C,
respectively.
Depending
angle,
heat‐treated
was
about
11%–43%
higher
than
that
untreated
specimens.
Interestingly,
it
found
had
a
more
significant
HT.
In
case
WI,
increased
by
27%–57%
compared
Joint
tests
revealed
exerted
similar
positive
joints.
findings
highlighted
is
least
effective
in
increasing
strengths
3D‐printed
parts.
Polymers,
Journal Year:
2023,
Volume and Issue:
15(5), P. 1196 - 1196
Published: Feb. 27, 2023
Poly(lactic
acid)
(PLA)
is
considered
the
most
promising
biobased
substitute
for
fossil-derived
polymers
due
to
its
compostability,
biocompatibility,
renewability,
and
good
thermomechanical
properties.
However,
PLA
suffers
from
several
shortcomings,
such
as
low
heat
distortion
temperature,
thermal
resistance,
rate
of
crystallization,
whereas
some
other
specific
properties,
i.e.,
flame
retardancy,
anti-UV,
antibacterial
or
barrier
antistatic
conductive
electrical
characteristics,
etc.,
are
required
by
different
end-use
sectors.
The
addition
nanofillers
represents
an
attractive
way
develop
enhance
properties
neat
PLA.
Numerous
with
architectures
have
been
investigated,
satisfactory
achievements,
in
design
nanocomposites.
This
review
paper
overviews
current
advances
synthetic
routes
nanocomposites,
imparted
each
nano-additive,
well
numerous
applications
nanocomposites
various
industrial
fields.
Chemical Communications,
Journal Year:
2023,
Volume and Issue:
59(85), P. 12731 - 12734
Published: Jan. 1, 2023
Here,
we
prepared
a
series
of
thiourea-based
organocatalysts
1-7
by
combining
two
stereogenic
elements:
binaphthyl-amine
and
cyclohexyl
diamine
moieties.
Catalyst
(R,S)-1
facilitated
stereoselective
polymerization
rac-LA
to
afford
iso-enriched
PDLA
with
Pm
0.96
while
its
enantiomer
(S,R)-1
produced
PLLA
0.96.
These
PLA
contributed
forming
stereocomplexed
significantly
increased
Tm
196
°C.
Polymers,
Journal Year:
2023,
Volume and Issue:
15(12), P. 2658 - 2658
Published: June 12, 2023
The
isolation
of
keratin
from
poultry
feathers
using
subcritical
water
was
studied
in
a
batch
reactor
at
temperatures
(120–250
°C)
and
reaction
times
(5–75
min).
hydrolyzed
product
characterized
by
FTIR
elemental
analysis,
while
the
molecular
weight
isolated
determined
SDS-PAGE
electrophoresis.
To
determine
whether
disulfide
bond
cleavage
followed
depolymerization
protein
molecules
to
amino
acids,
concentration
27
acids
hydrolysate
analyzed
GC/MS.
optimal
operating
parameters
for
obtaining
high
were
180
°C
60
min.
obtained
under
conditions
ranged
4.5
12
kDa,
content
dried
low
(2.53%
w/w).
Elemental
analyses
unprocessed
showed
no
significant
differences
structure.
Obtained
is
colloidal
solution
with
tendency
particle
agglomeration.
Finally,
positive
influence
on
skin
fibroblast
viability
observed
processing
concentrations
below
6.25
mg/mL,
which
makes
interesting
various
biomedical
applications.
Horticulturae,
Journal Year:
2025,
Volume and Issue:
11(3), P. 303 - 303
Published: March 11, 2025
Active
packaging
using
an
edible
coating
could
be
essential
and
sustainable
alternative
solution
to
preserve
the
properties
of
fruits
prevent
food
loss
waste.
Fruits
generate
significant
wastes
losses.
Reducing
waste
is
a
global
priority.
For
this
research,
nature-based
solutions
(NBSs)
were
applied,
micro-sized
chitosan
(CsMPs)
selenium
microparticles
(SeMPs),
which
are
green-synthesized
from
black
tea
leaf
extracts,
thyme
oil.
In
study,
effects
new
generation
active
preservative
agents
formed
combinations
oil
(Oil)
on
quality
“0900
Ziraat”
sweet
cherry
after
harvest
investigated.
After
coated
with
colloid
solution,
they
stored
at
4
°C
21
for
20
days,
parameter
analyses
performed
days
0,
5,
10,
15,
20.
As
result
it
was
determined
that
application
CsMPs
+
SeMPs
subsequent
Oil
coatings
reduced
weight
loss,
respiration,
decay
rates.
Also,
these
applications
most
effective
in
preserving
color
values
(L*,
chroma,
hue),
fruit
firmness,
total
soluble
solid
(TSS)
amount,
acidity
content
phenolics,
anthocyanin,
antioxidant
capacity.
These
results
show
can
used
as
extend
their
shelf
life
harvest.
This
study’s
will
contribute
obtaining
composite
agents/agents
produced
technology
life.
International Journal of Biological Macromolecules,
Journal Year:
2024,
Volume and Issue:
270, P. 132308 - 132308
Published: May 11, 2024
UV-ozone
activated
polypropylene
(PP)
food
films
were
subjected
to
a
novel
bilayer
coating
process
involving
primary
or
quaternary
chitosan
(CH/QCH)
as
the
first
layer
and
natural
extracts
from
juniper
needles
(Juniperus
oxycedrus;
JUN)
blackberry
leaves
(Rubus
fruticosus;
BBL)
second
layer.
This
innovative
approach
aims
redefine
active
packaging
(AP)
development.
Through
detailed
analysis
by
surface
characterization
bioactivity
assessments
(i.e.,
antioxidant
antimicrobial
functionalities),
we
evaluated
different
combinations.
Furthermore,
investigated
stability
barrier
characteristics
inherent
in
these
coatings.
The
confirmed
deposition,
coupled
with
comprehensive
of
their
composition
morphology,
underscored
efficacy
Our
investigation
included
wettability
assessment
via
contact
angle
(CA)
measurements,
X-ray
photoelectron
spectroscopy
(XPS),
attenuated
total
reflectance
Fourier-transform
infrared
(ATR-FTIR),
which
revealed
substantial
enhancements
concentrations
elements
functional
groups
CH,
QCH,
JUN,
BBL.
Scanning
electron
microscopy
(SEM)
unveiled
coatings'
heterogeneity,
while
time-of-flight
secondary
ion
mass
spectrometry
(ToF-SIMS)
CA
profiling
showed
moderately
compact
bilayers
on
PP,
providing
species
hydrophilic
surface,
respectively.
coatings
significantly
reduced
oxygen
permeability.
Additionally,
single-layer
depositions
CH
QCH
remained
below
overall
migration
limit
(OML).
Remarkably,
exhibited
robust
antioxidative
properties
due
plant
exceptional
activity
against
S.
aureus,
attributed
QCH.
These
findings
underscore
pivotal
role
film
governing
bioactive
offer
promising
pathway
for
enhancing
functionality.
Applied Surface Science,
Journal Year:
2023,
Volume and Issue:
651, P. 159230 - 159230
Published: Dec. 27, 2023
The
use
of
biopolymers
like
poly(lactic
acid)
(PLA)
doped
with
natural
and
harmless
active
agents
in
industrial,
medical
food
packaging
applications
is
great
interest
due
to
the
multitude
property
enhancements
included.
External
factors,
such
as
UV
exposure,
can
accelerate
degradation
process
these
biomaterials
cause
changes
structural
mechanical
properties
or
industrial
devices.
In
this
research,
PLA-based
composites
different
degrees
crystallinity
are
fabricated
using
magnesium
(Mg)
particles
quercetin
(Qr)
doping
agents,
providing
new
responses
against
an
UV-C
radiation
source.
Physical
surface
studied
by
atomic
force
microscopy
(AFM),
goniometry
scanning
electron
(SEM).
Chemical
modifications
evaluated
Fourier
transform
infrared
spectroscopy
(FTIR),
X-ray
photoelectron
(XPS)
diffraction
(XRD).
Thermal
response
differential
calorimetry
(DSC).
PLA
crucial
polymer
radiation.
Under
irradiation
Mg
a
catalytic
effect
that
enhances
hydrolysis
chains.
However,
when
Qr
present
inhibited,
making
Qr/Mg
combination
ideal
enrichment
protect
from
chemical
photooxidation,
while
improving
biocomposite.
