Abstract
Bamboo,
which
is
called
“green
gold”
because
of
its
sustainability
characteristics,
has
many
wonderful
properties
that
make
it
environmentally
friendly.
In
this
study,
polyurethane
(PU)
composites
used
in
the
automotive
industry
were
produced
by
adding
different
amounts
bamboo
powders
(1,
2.5,
5,
7.5,
10
and
15%,
w/v)
to
PU
foams.
regard,
density,
light
stereomicroscopic
analysis,
thermal
conductivity,
spectroscopic
mechanical
(compression)
test
have
been
performed.
Further,
sound
absorption
analysis
contact
angle
carried
out.
Optical
stereomicroscopes
showed
average
pore
sizes
with
range
258–482
µm.
As
powder
increased,
values
decreased
from
129
°
88
°.
Compression
force
deflection
samples
declined
1850
360
g/cm
2
.
Similar
properties,
conductivities
foams
decreased.
However,
regards
FT‐IR,
no
chemical
reactions
observed
between
matrix
powder.
The
results
filled
are
materials
rigid
foam
2.5%
(w/v)
(PU‐2.5)
sample
had
better
than
bamboo‐powder‐unfilled
(PU‐0),
an
coefficient
value
0.86
at
6300
Hz
0.71
1600–6300
Hz.
Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
45(14)
Опубликована: Апрель 19, 2024
Abstract
Various
acoustic
materials
are
developed
to
resolve
noise
pollution
problem
in
many
industries.
Especially,
with
porous
structure
broadly
used
absorb
sound
energy
civil
construction
and
transportation
area.
Polyurethane
(PU)
possess
excellent
damping
properties,
good
toughness,
well‐developed
pore
structures,
which
have
a
broad
application
prospect
absorption
field.
This
work
aims
summarize
the
recent
progress
of
fabrication
for
PU
application.
The
mechanisms
introduced.
Different
kinds
typical
covered
highlighted,
include
foam,
modified
materials,
aerogel,
templated
PU,
special
materials.
Finally,
development
direction
existing
problems
material
briefly
prospected.
It
can
be
expected
that
high
coefficient
obtained
by
using
some
facile
methods.
design
accurate
regulation
structures
or
multilayer
is
favorably
recommended
fulfill
demand
industrial
commercial
applications
future
work.
Construction and Building Materials,
Год журнала:
2024,
Номер
426, С. 136054 - 136054
Опубликована: Апрель 9, 2024
Using
natural
porous
and
fibrous
materials
for
acoustic
thermal
conditioning
in
the
construction
sector
is
a
solution
to
achieve
comfort
level
buildings.
The
novelty
of
this
research
work
lies
employing
agricultural
agro-industry
waste
solve
noise
insulation
problems.
This
study
was
conducted
investigate
multilayered
panel
made
fruit
stones
coconut
fibre
from
waste.
Acoustic
absorption,
transmission,
tests
were
run
on
four
different
stone
types,
olive,
cherry,
apricot
peach,
plus
layer.
Although
they
are
not
structural
elements,
bending
ensure
panels'
integrity.
complied
with
recommendations
Standards
ISO
10534–2
ASTM
E
2611–09,
based
standing
wave
tube
obtain
absorption
coefficient
sound
transmission
loss,
respectively.
Standard
EN
12667
considered
test
determine
conductivity
hot
plate
method.
results
show
an
average
above
0.5
over
25
dB
within
certain
frequency
ranges.
cherry
panels
had
values
around
0.7
apricots
up
30
dB.
Samples'
transmittance
between
3.0
3.4
(W/m2K),
which
indicate
ability
provide
insulation.
olive
obtained
lowest
(around
0.14
W/mK).
backing
effect
layer
improves
all
properties.
Cellular Polymers,
Год журнала:
2023,
Номер
42(5-6), С. 204 - 225
Опубликована: Сен. 1, 2023
This
study
brokes
new
ground
to
understand
the
insulation
and
permeability
performances
of
rigid
polyurethane
foams
(RPUFs)
containing
different
contents
micron-sized
turkey
feather
powders
(TFPs)
depending
on
free
volume
change
for
first
time.
The
effects
TFPs
loading
RPUFs
were
investigated
by
examination
their
structural
chemical
features
(particle
size
ATR-FTIR
analyses),
property
(PALS
analysis),
(thermal
conductivity
sound
absorption
tests),
performance
(air
water
vapor
tests)
cellular
topology
(SEM).
PALS
analysis
results
revealed
that
addition
into
led
sharp
decrease
in
all
parameters
since
caused
formation
disordered
cells
occupying
holes
matrix.
Furthermore,
both
thermal
acoustic
resulting
get
worse
when
compared
unfilled
RPUF.
attributed
thinner
weaker
during
polymerization,
reduction
amount
CO
2
inside
cells,
enhancement
solid-phase
level
matrix
due
increasing
volumetric
density.
Additionally,
foam
samples
with
high
content
showed
considerably
lower
air
permeabilities
neat
dominant
hydrophobic
character
keratin
degree
vacancies
SEM
also
good
compatibility
RPUF,
but
distorted
irregular
shaped
morphology
was
obtained
at
contents.
Polymers and Polymer Composites,
Год журнала:
2022,
Номер
30
Опубликована: Янв. 1, 2022
Polyols
from
chaulmoogra
seed
oil
and
grape
were
prepared
by
epoxidation
ring
opening
of
oxirane
using
lactic
acid
in
nitrogen
atmosphere
with
a
control
over
their
functionality.
Nanocellulose
was
derived
Desmostachya
Bipinnata
grass
leaves
further
surface
functionalized.
Modified
nanocellulose
used
as
filler
to
prepare
porous
flexible
bio-based
polyurethane
nanocomposites
via
in-situ
polymerization.
Adsorption
malachite
green
(MG)
dye
wastewater
the
composites
carried
out.
The
effect
varying
factors
such
weight
percentage
filers
(modified
nanocellulose),
dosage
adsorbent,
pH,
temperature
time
on
MG
adsorption
have
been
studied
experimentally.
Material
characterization
for
materials
out
FTIR,
NMR,
TGA,
DSC,
SEM
along
other
physical
chemical
methods.
FTIR
results
indicated
presence
peaks
at
1704
cm
−1
–C=O
stretching
vibrations
urethane
groups,
1531
–NH
bending,
1232
–C–N
1105
–C–O
group
(–NHCOO–)
thus,
indicating
formation
linkage
polyurethane.
functionality
around
2.8
obtained
oils,
which
has
contributed
forming
polyurethanes.
Morphological
studies
indicate
nano
fibrillation
cellulose
closed-cell
porosity
its
composites.
PU
displayed
improved
thermal
stability
256.3°C
270.5°C.
Taguchi’s
L
27
orthogonal
array
applied
experimental
design
optimization
analyzed
ANOVA
raw
S/N
ratio.
It
found
that
pH
is
most
influential
factor
lead
quantity
nanocellulose,
time,
adsorbent
temperature.
Journal of Cleaner Production,
Год журнала:
2023,
Номер
425, С. 138903 - 138903
Опубликована: Сен. 17, 2023
The
main
aim
of
this
study
was
to
assess
the
efficacy
water
hyacinth
stem
as
insulation
material
by
analysing
its
thermal
and
acoustic
performance.
Several
particleboards
composites
were
prepared
adding
either
binders
or
blending
with
other
construction
materials.
During
preparation
samples,
various
factors
including
sample
thickness,
average
particle
size
in
degree
compaction,
type
binder
used
taken
into
consideration.
Particleboards
manually
compacted
particles
range
1–2
mm
a
14
thickness
showed
lowest
conductivity
coefficient
highest
value
weighted
absorption
coefficient.
Additionally,
mixed
gypsum
reached
lower
higher
sound
values
than
those
observed
for
cement-based
obtained
under
same
conditions.
found
published
literature
types
biomass
materials
suggest
that
has
significant
potential
use,
alone
combination
materials,
conditioning
material.
