Thermal Decomposition of Date Seed/Polypropylene Homopolymer: Machine Learning CDNN, Kinetics, and Thermodynamics
Polymers,
Год журнала:
2025,
Номер
17(3), С. 307 - 307
Опубликована: Янв. 23, 2025
The
buildup
of
abandoned
plastics
in
the
environment
and
need
to
optimize
agricultural
waste
utilization
have
garnered
scrutiny
from
environmental
organizations
policymakers
globally.
This
study
presents
an
assessment
thermal
decomposition
date
seeds
(DS),
polypropylene
homopolymer
(PP),
their
composites
(DS/PP)
through
experimental
measurements,
machine
learning
convolutional
deep
neural
networks
(CDNN),
kinetic
thermodynamic
analyses.
measurements
involved
pyrolysis
co-pyrolysis
these
materials
a
nitrogen-filled
thermogravimetric
analyzer
(TGA),
investigating
degradation
temperatures
between
25
600
°C
with
heating
rates
10,
20,
40
°C.min−1.
These
revealed
two-stage
process
for
bio-composites
decrease
stability
pure
PP
due
moisture,
hemicellulose,
cellulose
content
DS
material.
By
utilizing
CDNN,
algorithms
frameworks
were
developed,
providing
responses
that
closely
matched
(R2~0.942)
data.
After
various
modelling
modifications,
adjustments,
regularization
techniques,
framework
comprising
four
hidden
neurons
was
determined
be
most
effective.
Furthermore,
analysis
temperature
influential
parameter
affecting
process.
Kinetic
analyses
performed
using
Coats–Redfern
general
Arrhenius
model-fitting
methods,
as
well
Flynn–Wall–Ozawa
Kissinger–Akahira–Sunose
model-free
approaches.
first-order
reaction
mechanism
identified
appropriate
compared
second
third
order
F-Series
solid-state
mechanisms.
overall
activation
energy
values
estimated
at
51.471,
51.221,
156.080,
153.767
kJ·mol−1
respective
models.
Additionally,
compensation
effect
showed
exponential
increase
pre-exponential
factor
increasing
values,
parameters
indicated
is
endothermic,
non-spontaneous,
less
disordered.
Язык: Английский
Synergistic Combination of Polydopamine and Polypyrrole in Natural Pectin/PVA-Based Freestanding Electrodes for High-Performance Supercapacitors
ACS Omega,
Год журнала:
2025,
Номер
10(6), С. 6025 - 6037
Опубликована: Фев. 6, 2025
In
this
study,
poly(vinyl
alcohol)
(PVA)/pectin/polypyrrole
(PPy)
and
PVA/pectin/polydopamine
(PDA)/PPy
hydrogel
films
were
prepared
for
use
as
supercapacitor
electrodes.
The
synergistic
effect
of
PDA
PPy
on
the
electrochemical
performance
PVA/pectin/PDA/PPy
electrode
was
studied.
PVA/pectin
composite
(VE10,
VE91,
VE73,
VE55)
with
varying
pectin
proportions
by
cross-linking
PVA
glutaraldehyde
to
serve
flexible
stretchable
gel
substrates
synthesized
surface
via
chemical
bath
deposition.
incorporation
optimized
significantly
enhanced
content
capacitance
PVA/pectin/PPy
film
(VE73/PPy-90),
achieving
a
measured
value
463.1
mF/cm2,
which
is
notably
higher
than
that
without
pectin.
To
further
enhance
composite,
in
situ
using
bath,
followed
polymerization.
combination
resulted
much
areal
specific
1575.7
mF/cm2
262.6
Fg1-
at
current
density
1
mA/cm2
(VE73/DA/PPy-90)
electrode.
After
charge-discharge
cycle
testing
mA/cm2,
VE73/PPy-90
VE73/DA/PPy-90
electrodes
retained
80%
70%
their
initial
capacitance,
respectively,
indicating
reasonable
stability.
capacitances
symmetric
based
electrode,
estimated
from
galvanostatic
charge/discharge
plots,
approximately
125.0
20.8
F
g-1,
mA/cm2.
device
exhibited
moderate
stability,
retaining
68%
its
after
10,000
cycles
Язык: Английский
Kinetics study of the thermal decomposition of date seed powder/HDPE plastic blends
Bioresource Technology Reports,
Год журнала:
2025,
Номер
unknown, С. 102028 - 102028
Опубликована: Янв. 1, 2025
Язык: Английский
Design and properties of high-performance polyaryl ether nitrile dielectric polymer materials for enhanced energy storage via tailored bisphenol monomers
Materials Today Communications,
Год журнала:
2025,
Номер
unknown, С. 111714 - 111714
Опубликована: Янв. 1, 2025
Язык: Английский
Thermodynamic parameters and phonon stability of CdX (X = Te, Se, S): a comparative study
The European Physical Journal B,
Год журнала:
2025,
Номер
98(1)
Опубликована: Янв. 1, 2025
Язык: Английский
Pyrolysis depolymerization of fresh natural rubber into liquid medium-chain bio-hydrocarbon products: Investigation of volatile-state kinetics approach and mechanism reaction analysis
Biomass and Bioenergy,
Год журнала:
2025,
Номер
197, С. 107840 - 107840
Опубликована: Апрель 3, 2025
Язык: Английский
Characterization and Kinetic Study of Agricultural Biomass Orange Peel Waste Combustion Using TGA Data
Polymers,
Год журнала:
2025,
Номер
17(8), С. 1113 - 1113
Опубликована: Апрель 19, 2025
This
study
presents
a
comprehensive
kinetic
and
thermodynamic
investigation
of
dried
orange
peel
(OP)
combustion,
employing
thermogravimetric
analysis
(TGA)
differential
thermogravimetry
(DTG)
at
high
heating
rates
(20–80
K
min−1).
gap
in
rate
motivates
the
novelty
present
study,
by
investigating
OP
combustion
20,
40,
60,
80
min−1
using
TGA,
to
closely
simulate
rapid
thermal
conditions
typical
industrial
processes.
Thermal
decomposition
occurred
three
distinct
stages
corresponding
sequentially
dehydration,
degradation
hemicellulose,
cellulose,
lignin.
Activation
energy
(Ea)
was
calculated
six
model-free
methods—Friedman
(FR),
Flynn–Wall–Ozawa
(FWO),
Kissinger–Akahira–Sunose
(KAS),
Starink
(STK),
Kissinger
(K),
Vyazovkin
(VY)—yielding
values
between
64
309
kJ
mol−1.
The
Ea
increased
progressively
from
initial
final
stages,
reflecting
stability
differences
among
biomass
constituents.
Further
Coats–Redfern
(CR)
model-fitting
method
identified
that
first-order
(F1),
second-order
(F2),
diffusion-based
mechanisms
(D1,
D2,
D3)
effectively
describe
combustion.
Calculated
parameters—including
enthalpy
(ΔH),
Gibbs
free
(ΔG),
entropy
(ΔS)—indicated
endothermic
increasingly
non-spontaneous
nature
reactions
higher
conversions.
These
findings
demonstrate
potential
OP,
an
abundant
agricultural
waste
product,
as
viable
bioenergy
resource,
contributing
valuable
insights
into
sustainable
Язык: Английский
Enhancing the high temperature resistance of nanocomposite materials through dimethyl methyl phosphate impregnation‐coating treatment
Journal of Polymer Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 29, 2024
Abstract
In
order
to
enhance
the
thermal
stability
of
polyvinyl
alcohol
(PVA),
a
modification
scheme
involving
dimethyl
methyl
phosphate
(DMMP)
impregnation‐coating
treatment
was
adopted
in
this
article.
Initially,
interfacial
compatibility
DMMP
with
PVA
characterized
using
scanning
electron
microscopy
(SEM),
inductively
coupled
plasma
spectroscopy,
elemental
analysis
and
Fourier
transform
infrared
spectroscopy
(FTIR).
Subsequently,
pyrolysis
combustion
properties
DMMP‐coated
were
evaluated
via
non‐isothermal
thermogravimetric
experiments
cone
calorimeter
tests.
The
products
then
analyzed
combination
chromatography
gas
chromatography/mass
spectrometry
(Py‐GC/MS).
Finally,
reaction
model
function
closer
actual
co‐pyrolysis
mechanism
at
high
temperatures
established
through
kinetics.
results
indicated
that
could
effectively
distribute
molecules
on
surfaces
particles.
Meanwhile,
coating
clearly
slow
peak
degradation
rate
grains
inhibit
under
fire
conditions.
Furthermore,
resulted
formation
over
40
distinct
compounds.
kinetic
revealed
article
better
characterize
PVA.
Язык: Английский
Noncovalent Cross‐Linked Network‐Reinforced High‐Toughness Polyvinyl Alcohol/Hyperbranched Polyester Films Obtained Through Solution Blending
Journal of Applied Polymer Science,
Год журнала:
2024,
Номер
142(10)
Опубликована: Дек. 11, 2024
ABSTRACT
Polyvinyl
alcohol
(PVA)
exhibits
good
water
solubility,
biocompatibility,
and
gas
barrier
properties.
It
is
an
important
renewable
biodegradable
polymeric
material
widely
used
in
drug
delivery,
food
packaging,
tissue
engineering,
etc.
However,
its
application
limited
by
insufficient
mechanical
performance.
Hyperbranched
polymers
are
a
class
of
highly
branched,
structured
macromolecular
with
multiple
branching
sites
rich
end
functional
groups.
In
this
work,
blend
films
were
prepared
mixing
PVA
water‐soluble
hyperbranched
polyester
(HBPE)
using
the
solution
casting
method.
The
results
showed
that
hydroxyl
groups
HBPE
could
form
hydrogen‐bond‐based
cross‐linking
network
PVA.
This,
turn,
will
effectively
improve
properties,
absorption,
thermal
stability,
film.
When
mass
ratio
to
1:4,
elongation
at
break
film
was
404.23%
tensile
strength
39.97
MPa.
PVA/HBPE
expected
be
more
applied
fields
such
as
packaging
materials,
Язык: Английский