Polymer Engineering and Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 28, 2025
Abstract
This
study
focuses
on
the
successful
incorporation
of
stearyl
methacrylate
(SMA)/glycidyl
(GMA)
copolymer,
together
with
paraffin,
into
metal–organic
framework
(MOF)
structures.
These
structures
were
prepared
using
a
simple
and
cost‐effective
process
as
an
alternative
to
challenging
conditions
such
encapsulation.
One
biggest
issues
encountered
in
phase
change
materials
(PCMs),
leakage
problem,
has
been
effectively
eliminated
thanks
this
MOF
structure.
Results
showed
that
melting
enthalpy
increased
from
50
119
J/g
by
increasing
amount
polymer
paraffin
ZIF‐NH
2
It
was
observed
PCMs
applied
textiles
exhibited
resistance
flow
at
elevated
temperatures.
As
result
epoxy‐amine
reactions
between
,
covalent
binding
achieved
textile
surface,
no
detected
when
fabrics
heated
up
90°C
specific
compositions.
The
regular
glycidyl
functional
groups
structure
facilitates
their
attachment
surface
without
requiring
additional
components.
In
contrast,
long
significantly
enhance
thermal
energy
storage
capacity.
With
contact
angle
above
100°,
PCM
coating
also
contributed
formation
hydrophobic
fabric
surface.
provide
comfort
dynamically
responding
environmental
temperature
changes.
feature
enables
use
smart
applications
products
management.
Highlights
ZIF/poly(GMA‐co‐SMA)
based
prepared.
covalently
bonded
ZIF
via
reactions.
impregnated
materials.
50–119
leakage.
contribute
advancement
applications.
Materials,
Год журнала:
2025,
Номер
18(4), С. 728 - 728
Опубликована: Фев. 7, 2025
This
paper
presents
a
new
composite
phase
change
material
made
of
paraffin
and
recycled
aluminum
sawing
chips.
Aluminum
chips
were
selected
as
thermal
conductivity
enhancer,
the
volume
fraction
(~15%)
which,
in
material,
was
minimized
by
selecting
with
shape
that
minimizes
its
packing
density.
Therefore,
particles
remained
contact
inside
composite,
thus,
their
sinking
liquid
state
avoided.
The
obtained
had
latent
heat
capacity
reduced
20%
compared
to
increased
236%.
materials
also
wide
active
temperature
range
(33-65
°C).
Incorporation
this
brick
cavities
tested
way
improving
transfer
fluctuations
hot
hours
day.
experimental
data
show
maximum
difference
about
3
°C
comparison
bricks
without
incorporated.
To
evaluate
environmental
impact
Global
Warming
Potential
(CO2eq)
determined.
results
highlighted
less
CO2eq
other
materials.
Civil Engineering Journal,
Год журнала:
2024,
Номер
10(6), С. 1788 - 1805
Опубликована: Июнь 1, 2024
One
of
the
high-performance
technologies
for
serial
production
small-sized
metal
and
ceramic
complex-profile
parts
is
powder
injection
molding
(PIM).
The
most
industrially
demanded
types
polymer
binder
in
PIM
technology
are
polyoxymethylene-based
compositions
wax-polyolefin
mixtures.
Despite
large
number
studies
devoted
to
different
technology,
actual
task
still
a
comparative
analysis
properties
determine
their
advantages
disadvantages,
as
well
optimization
used
compositions.
In
this
regard,
study
aims
at
thermophysical
feedstocks
with
based
on
polyoxymethylene
mixtures
under
condition
using
identical
steel
filler.
specific
heat
capacity,
temperatures,
phase
transitions,
thermal
inertia
effective
conductivity
compared
feedstocks,
were
determined
result
calculation-experimental
study.
obtained
data
can
replenish
knowledge
bases
necessary
simulation
modeling
optimizing
processes
various
products
made
42CrMo4
steel.
As
powders,
kinetic
effects
forming
less
significant
than
those
analogs
binder,
which
facilitates
moldability.
Thus,
feedstock
has
significantly
higher
rate
temperature
field
leveling
binder.
Because
insignificant
difference
have
1.5
times
approximately
20%
filler
form
mixture.
technological
include
possibility
processing
lower
temperatures.
Doi:
10.28991/CEJ-2024-010-06-05
Full
Text:
PDF
Materials,
Год журнала:
2025,
Номер
18(1), С. 164 - 164
Опубликована: Янв. 3, 2025
A
novel
organic–inorganic
eutectic
phase
change
material
(PCM)
based
on
sodium
acetate
trihydrate
(SAT)
and
polyethylene
glycol
(PEG)
was
developed
to
meet
the
needs
of
heat
recovery
building
heating.
Three
kinds
PEG
with
different
molecular
weights
were
selected
form
PCM
SAT.
The
thermal
properties
three
series
SAT-PEG
compared
DSC
results,
focusing
impact
addition
temperature
enthalpy
SAT,
as
well
melting
uniformity.
inhibitory
effects
two
nucleating
agents
supercooling
systematically
investigated.
effect
crystallization
behavior
SAT
studied
using
a
metallographic
microscope.
To
evaluate
reliability
PCM,
600
cycles
melting–solidification
experiments
conducted.
Experimental
results
show
that
can
PCMs
PEG200,
PEG600,
PEG6000,
respectively,
high
excellent
ranged
from
55
°C
60
250–280
kJ/kg.
cooling
curves
10
wt%
tetrasodium
pyrophosphate
decahydrate
(TPD)
reduce
degree
less
than
1
°C.
Significantly,
all
exhibit
exceptional
after
melting–solidification,
shifts
in
temperatures
enthalpies
4%.
XRD
diffraction
patterns
showed
PEG,
TPD
physically
mixed
without
chemical
reaction
new
substances.
Microscopic
images
reveal
preserves
original
needle-shaped
crystal
morphology
while
reducing
its
size.
rapid
formation
small
crystals
provide
more
nucleation
points
expedite
crystallization,
thereby
enhancing
release
capabilities
PCM.
Nanomaterials,
Год журнала:
2025,
Номер
15(2), С. 110 - 110
Опубликована: Янв. 12, 2025
Paraffin
wax
(PW)
has
significant
potential
for
spacecraft
thermal
management,
but
low
conductivity
and
leakage
issues
make
it
no
longer
sufficient
the
requirements
of
evolving
control
systems.
Although
free-state
expanded
graphite
(EG)
as
a
enhancer
can
ameliorate
above
problems,
remains
challenging
to
achieve
higher
(K)
(>8
W/(m·K))
at
filler
contents
below
10
wt.%
mitigate
problem.
Two
preparations
thermally
conductive
shape-stabilized
PW/EG
composites,
using
pressure-induced
method
prefabricated
skeleton
method,
were
designed
in
this
paper.
The
formed
nanoscale
porous
structure
by
different
methods,
which
enhanced
capillary
action
between
flake
layers,
improved
adsorption
encapsulation
EG,
alleviated
latent
heat
phase-change
materials
(PCM)
prepared
two
methods
mentioned
are
9.99
W/(m·K),
10.70
W/(m·K)
240.06
J/g,
231.67
respectively,
EG
loading
wt.%,
residual
mass
fraction
was
greater
than
99%
after
50
cycles
high
temperature.
In
addition,
due
excellent
management
capability
PW/EG,
operating
temperature
electronic
components
be
stably
maintained
68–71
°C
about
15
min
peak
reduced
least
23
when
heating
power
is
w.
These
provide
novel
cost-effective
further
improve
