Catalysts,
Год журнала:
2022,
Номер
12(12), С. 1573 - 1573
Опубликована: Дек. 3, 2022
The
present
study
aims
to
develop
new
energetic
composites
containing
nanostructured
nitrocellulose
(NNC)
or
nitrated
cellulose
(NC),
hydrazinium
nitro
triazolone
(HNTO),
and
MgAl-CuO
nanothermite.
prepared
formulations
(NC/HNTO/MgAl-CuO
NNC/HNTO/MgAl-CuO)
were
analyzed
using
various
analytical
techniques,
such
as
Fourier-transform
infrared
(FTIR),
scanning
electron
microscopy
(SEM),
thermogravimetry
(TGA),
differential
calorimetry
(DSC).
outstanding
catalytic
impact
of
on
the
thermal
behavior
developed
was
elucidated
by
kinetic
modeling,
applied
DSC
data
isoconversional
methods,
for
which
a
considerable
drop
in
activation
energy
acquired
formulations,
highlighting
influence
introduced
Overall,
obtained
findings
demonstrated
that
newly
elaborated
NC/HNTO/MgAl-CuO
NNC/HNTO/MgAl-CuO
could
serve
promising
candidates
application
next
generation
composite
explosives
high-performance
propellants.
Polymers,
Год журнала:
2023,
Номер
15(7), С. 1799 - 1799
Опубликована: Апрель 6, 2023
To
develop
advanced
cellulose-based
energetic
composites,
new
types
of
high-energy-density
formulations
containing
hydrazine
3-nitro-1,2,4-triazol-5-one
(HNTO)/ammonium
nitrate
(AN)
cocrystals
combined
with
nitrocellulose
or
nanostructured
cellulose
(NC
and
NMCC)
were
experimentally
characterized.
The
prepared
analyzed
in
terms
their
physicochemical
properties,
mechanical
sensitivities,
structural
features,
thermal
behavior.
Their
heats
combustion
theoretical
performance
assessed
as
well.
Experimental
results
exhibited
the
inherent
characteristics
designed
NC@HNTO/AN
NMCC@HNTO/AN,
including
improved
density,
specific
impulse,
impact
sensitivity
compared
to
raw
compounds.
Besides
that,
thermo-kinetic
findings
revealed
that
as-prepared
insensitive
composites
undergo
two
exothermic
decomposition
processes,
has
higher
activity.
present
study
demonstrated
outstanding
could
serve
a
reference
for
developing
more
formulations.
Materials,
Год журнала:
2022,
Номер
15(22), С. 8138 - 8138
Опубликована: Ноя. 16, 2022
This
research
work
aimed
to
elaborate
on
a
new
modified
double-base
propellant
containing
nitrocellulose
(NC),
ammonium
nitrate
(AN),
and
diethylene
glycol
dinitrate
(DEGDN).
The
developed
AN/NC-DEGDN
formulation
was
successfully
obtained
through
casting
process
fully
characterized
in
terms
of
its
chemical
structure,
morphological
features,
thermal
behavior.
Beforehand,
theoretical
calculation
by
the
CEA-NASA
program
applied
select
optimal
composition
formulation.
Experimental
findings
demonstrated
homogenous
dispersion
AN
oxidizer
NC-DEGDN
matrix
without
alteration
their
molecular
structures.
catalytic
influence
decomposition
behavior
film
also
elucidated
analyses.
When
incorporated
into
formulation,
peak
temperatures
for
different
processes
were
shifted
toward
lower
temperatures,
while
total
enthalpy
increased
around
1272.24
J/g.
In
addition,
kinetics
double
base
investigated
using
DSC
results
coupled
with
model
kinetic
approaches.
It
found
that
addition
decreases
activation
energy
esters
from
134.5
kJ/mol
118.84
kJ/mol,
providing
evidence
excellent
effect.
Overall,
this
investigation
could
serve
as
reference
developing
future
generation
propellants.
Carbohydrate Polymer Technologies and Applications,
Год журнала:
2022,
Номер
3, С. 100205 - 100205
Опубликована: Апрель 14, 2022
The
mild
and
simple
direct
organocatalytic
esterification
of
cellulose
nanocrystals
(CNC)
nanocellulose-based
materials
(e.g.
foams
films)
with
thioglycolic
acid
(TGA)
is
disclosed.
transformation
gives
the
corresponding
thiol
group
(-SH)
functionalized
crystalline
nanocellulose
(CNC-SH)
using
simple,
naturally
occurring,
non-toxic
organic
acids
tartaric
acid)
as
catalysts.
We
also
discovered
that
TGA
autocatalytic
(i.e.
catalyzing
its
own
esterification).
introduction
-SH
functionality
at
surface
opens
up
for
further
selective
applications.
This
was
demonstrated
by
attaching
catalysts
fluorescent
molecules,
which
are
useful
sensors,
to
CNC-SH
thiol-ene
click
chemistry.
Another
application
use
CNC-SH-based
foam
a
heterogeneous
biomimetic
reducing
agent,
stable
during
multiple
recycles,
copper-catalyzed
alkyne-azide
1,3-dipolar
cycloaddition
("click"
reaction).
ACS Applied Polymer Materials,
Год журнала:
2023,
Номер
5(11), С. 9103 - 9115
Опубликована: Окт. 30, 2023
Energetic
binders,
essential
components
of
energetic
materials
(EMs),
act
as
the
main
support
for
energy
and
mechanical
properties
propulsion.
Compared
with
conventional
nitrocellulose
(NC),
two
nitrated
bacterial
cellulose
(NBC)
nitrate
glycerol
ether
(NGEC),
exhibit
promising
applications
in
enhancing
strength
propulsion
due
to
their
inherent
physicochemical
features.
Herein,
we
present
a
series
characterizations
methods
study
structures
NC,
NBC,
NGEC
by
scanning
electron
microscopy
(SEM),
X-ray
diffraction
(XRD),
Fourier
transform
infrared
(FT-IR)
spectroscopy,
Raman
photoelectron
spectroscopy
(XPS).
More
importantly,
thermal
analysis
was
performed
under
four
universal
heating
conditions:
programmed,
constant
temperature,
high
pressure,
adiabatic.
It
found
that
NBC
exhibited
higher
stability
activation
(Ea)
iso-conversional
rate
kinetic
analysis,
including
Friedman,
Vyazovkin,
Ozawa–Flynn–Wall
(OFW),
Kissinger–Akahira–Sunose
(KAS)
methods.
Under
high-pressure
conditions,
decomposition
reaction
NC
promoted
increased
pressure
range
0–3
MPa,
such
decreased
whereas
stability.
adiabatic
it
presented
than
can
produce
more
gases
generate
less
time.
be
concluded
binders
different
exert
various
effects.
Hence,
results
this
work
on
may
offer
fundamental
theory
data
supporting
future
formulas.
