Cardanol Modified Alkyd Resin: Novel Route to Prepare Mos2 Based Polyurethane Nanocomposite Coatings
Опубликована: Янв. 1, 2025
Язык: Английский
Environmental benefits of valorising food waste into bio-based polyols for the production of polyurethane rigid foams
Sustainable Production and Consumption,
Год журнала:
2024,
Номер
51, С. 572 - 583
Опубликована: Окт. 9, 2024
Язык: Английский
Unveiling the Potential of Plant-Derived Diarylheptanoids and Their Derivatives in Bio-Based Polyurethane Compositions
Plants,
Год журнала:
2025,
Номер
14(5), С. 775 - 775
Опубликована: Март 3, 2025
The
key
challenge
in
polymer
science
is
developing
sustainable
synthesis
methods
using
renewable
feedstocks.
This
study
explores
plant-derived
diarylheptanoids
with
various
structures
as
the
building
blocks
for
polyurethane
(PU)
materials.
Diarylheptanoid
glucosides
isolated
from
black
alder
(Alnus
glutinosa)
bark
were
hydrolyzed
and
fractionated
to
remove
sugar
moieties.
resulting
diarylheptanoids,
along
unhydrolyzed
analogues
curcumin,
used
biomass-based
polyols
synthesize
model
PU
films.
Incorporating
enhanced
mechanical
strength
reduced
flexibility
of
due
increased
crosslinking,
effects
proportional
OH
functionality
polyols.
Weight
loss,
FTIR,
Py-GC-MS/FID
analyses
revealed
that
catechol
moieties
glucosidic
bonds
are
biodegradable
structural
subunits
incorporated
into
Rigid
foams
(PURs)
incorporating
high-OH-functionality
diarylheptanoid
such
oregonin
demonstrated
significantly
higher
compression
less
weight
loss
during
non-isothermal
thermal
analysis
air
compared
those
commercial
polyol-based
foams.
A
cone
calorimeter
test
showed
PUR
foam
derivatives
had
a
lower
degradation
rate,
longer
flame-burning
time,
30%
heat
emission,
25%
smoke,
indicating
improved
flame
retardancy.
Adding
1–2%
oregonin-enriched
extracts
Elastopir
1132/509/0
its
resistance
oxidative
aging,
outperforming
antioxidant
Irganox.
Язык: Английский
Unlocking the Potential of Lignin-based Polyhydroxyurethanes: Insights into Kinetics, Physical Behavior, and Recyclability
Materials Today Sustainability,
Год журнала:
2025,
Номер
unknown, С. 101117 - 101117
Опубликована: Апрель 1, 2025
Язык: Английский
Study on Mechanical Properties of Elliptical Negative Poisson’s Ratio Rubber Material
Hans Journal of Civil Engineering,
Год журнала:
2025,
Номер
14(04), С. 893 - 905
Опубликована: Янв. 1, 2025
Язык: Английский
Rethinking the Design of Upholstered Seating from a Circular and Acoustics-Conscious Perspective
Опубликована: Янв. 1, 2025
Язык: Английский
Waste-Cooking-Oil-Derived Polyols to Produce New Sustainable Rigid Polyurethane Foams
Sustainability,
Год журнала:
2024,
Номер
16(21), С. 9456 - 9456
Опубликована: Окт. 31, 2024
Polyurethanes
(PUs)
are
one
of
the
most
versatile
polymeric
materials,
making
them
suitable
for
a
wide
range
applications.
Currently,
petroleum
is
still
main
source
polyols
and
isocyanates,
two
primary
feedstocks
used
in
PU
industry.
However,
due
to
future
price
uncertainties
need
eco-friendly
alternatives,
recent
efforts
have
focused
on
replacing
petrol-based
isocyanates
with
counterparts
derived
from
renewable
resources.
In
this
study,
waste
cooking
oil
was
as
feedstock
obtain
(POs)
new
sustainable
polyurethane
foams
(PUFs).
POs
various
hydroxyl
numbers
were
synthesized
through
epoxidation
followed
by
oxirane
ring
opening
diethylene
glycol.
By
adjusting
reagent
amounts
(acetic
acid
H2O2),
epoxidized
oils
(EOs)
different
degrees
(50–90%)
and,
consequently,
OH
(200–300
mg
KOH/g)
obtained.
Sustainable
PUFs
high
bio-based
content
produced
mixing
commercial
partially
aliphatic
isocyanate
using
water
blowing
agent
presence
gelling
catalyst
additives.
Various
(4,
8,
15
php)
(0,
1,
2
tested
assess
their
effect
foam
properties.
also
prepared
EOs
instead
investigate
potential
use
directly
PUF
production.
Characterization
included
morphological,
chemical,
physical,
thermal,
mechanical
analyses.
The
rigid
exhibited
density
(150–300
kg/m³)
stability
up
200
°C.
combined
enabled
77
wt.%.
demonstrated
production
bypassing
second
synthesis
step,
enhancing
sustainability,
significantly
reducing
energy
costs;
however,
formulations
require
optimization
lower
epoxy
reactivity.
Язык: Английский
Research on the Mechanical Properties of Elliptical Negative Poisson’s Ratio Structures
Buildings,
Год журнала:
2024,
Номер
14(12), С. 3965 - 3965
Опубликована: Дек. 13, 2024
A
negative
Poisson’s
ratio
structure
has
special
deformation
behavior
and
energy
absorption
characteristics,
is
a
new
with
broad
application
prospects.
However,
most
of
the
current
research
still
at
micro
theoretical
level,
there
less
on
macro
mechanical
properties.
Therefore,
this
paper
proposes
polyurethane
elliptical
(PES),
uses
methods
experimental
simulation
numerical
to
carry
out
comparison
concave
(PCS)
analyze
influence
length–width
structure,
highlighting
advantages
PES
in
absorption,
using
parameter
analysis
study
structural
form
material
properties
elastic
modulus
PES,
so
as
provide
scientific
basis
technical
support
for
high-end
equipment
manufacturing,
seismic
isolation
other
fields.
Язык: Английский