ACS Applied Nano Materials,
Год журнала:
2024,
Номер
7(21), С. 24819 - 24832
Опубликована: Окт. 28, 2024
Efficient
conversion
of
abundant
biomass
into
high-value
chemicals
is
crucial
for
sustainable
chemical
production.
Herein,
we
report
the
design
and
synthesis
a
Pd
nanoparticles
(NPs)-embedded
N-doped
carbon
nitride
(Pd@NCN)
nanocomposite
photocatalytic
transformation
biomass-derived
compounds.
N-doping
using
DMF
significantly
enhanced
visible
light
absorption,
as
evidenced
by
DRUV
spectroscopy,
making
it
suitable
photocatalyst
blue
LED-driven
reactions.
Subsequent
decoration
with
NPs
remarkably
improved
catalyst's
performance.
UPS
measurements
revealed
that
NPs,
their
lower
Fermi
level
higher
work
function
compared
to
photoactive
support,
act
efficient
electron
acceptors,
promoting
charge
separation
improving
catalytic
activity.
This
was
corroborated
PL,
TCSPC,
EIS
studies.
Photogenerated
electrons
on
surface-activated
hydrogen,
enabling
hydrogenation
derivatives
at
room
temperature.
Concurrently,
photogenerated
holes
were
consumed
IPA
via
O–H
C–H,
leading
acetone
formation.
The
optimized
1%
[email protected]
catalyst
exhibited
exceptional
activity
in
vanillin
(VAN),
achieving
79.6%
94.4%
selectivity
vanillyl
alcohol
(VOL)
within
an
hour.
Moreover,
reaction
could
be
tuned
adjusting
loading
time,
complete
VAN
excellent
(∼99%)
2-methoxy-4-methylphenol
(MMP)
2%
4.5
h.
Comprehensive
characterization
mechanistic
studies
provided
insights
structure–activity
relationship,
paving
way
development
advanced
NPs-based
photocatalysts
challenging
valorization
ambient
conditions.
Journal of Polymer Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 9, 2025
ABSTRACT
Polycarbonate
polymers
find
widespread
use
for
a
variety
of
applications.
Driven
by
the
need
to
transition
away
from
fossil‐based
resources,
there
is
increasing
interest
in
exploring
bio‐based
monomers
synthesis
polycarbonates.
One
interesting
class
molecules
that
can
be
isolated
biological
including
lignin,
are
hydroxycinnamic
acids.
This
paper
reports
library
aromatic
diols
using
p
‐coumaric
acid,
ferulic
and
sinapic
acid
as
starting
materials.
Using
dimethyl
carbonate,
these
polymerized
generate
semi‐aromatic
polycarbonate
homo‐
copolymers.
These
polycarbonates
depolymerized
via
an
organocatalyzed
process
afford
essentially
quantitative
yield.
The
obtained
this
depolymerization
could
subsequently
repolymerized,
with
no
purification
needed,
regenerate
original
polymer
identical
molecular
weight,
providing
pathway
chemical
recycling
European Polymer Journal,
Год журнала:
2023,
Номер
202, С. 112595 - 112595
Опубликована: Ноя. 14, 2023
The
insertion
of
rigid
aliphatic
or
aromatic
building
blocks
in
polymer
structures
is
an
efficient
synthetic
strategy
towards
high-Tg
materials.
In
the
present
work,
we
have
functionalized
isosorbide
5-methacrylate
with
various
lignin-inspired
esters
to
yield
a
series
isosorbide-2-aryl
carboxylate-5-methacrylate
monomers
(ArIMAs)
as
single
regioisomers.
selection
phenyl
carboxylate
side
groups
included
benzoate,
p-cyanobenzoate,
meta/para-methoxybenzoates,
and
different
vanillic
acid
esters.
This
afforded
range
seven
bio-based
size,
polarity,
substitutions.
Polymerizations
were
carried
out
by
conventional
free
radical
initiation
obtain
corresponding
high
molecular-weight
poly(aryl
methacrylate)s
(PArIMAs).
polymerizations
evaluated
solvents,
including
toluene,
EtOAc,
γ-valerolactone,
2-MeTHF,
DMSO
identify
most
suitable
conditions.
polymers
exhibited
glass
transition
temperatures
broad
range,
from
80
168
°C,
thermally
stable
up
268
°C.
Furthermore,
dynamic
rheology
experiments
indicated
that
sufficiently
for
melt
processing.
availability
combined
stability
make
these
materials
attractive
use
high-performance
plastics
coatings.
Journal of Polymer Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 11, 2024
ABSTRACT
Lignin,
comprising
20%–35%
of
lignocellulosic
biomass,
is
the
second
most
abundant
biopolymer
after
cellulose.
As
bioethanol
industry
expands,
accumulation
lignin
by‐products
necessitates
innovative
valorization
strategies.
This
study
explores
synthesis
and
characterization
lignin‐derived
composites.
Specifically,
reaction
20
wt.
%
guaiacol
or
syringol
with
80
elemental
sulfur
gives
composites
GS
SS
,
respectively.
The
chemical
structures
were
elucidated
using
GC–MS,
1
H
NMR,
UV–Vis
spectroscopy,
revealing
formation
both
SC
aryl
alkyl
bonds.
Thermal
morphological
analysis
(via
TGA,
DSC,
PXRD,
SEM‐EDS)
indicated
has
higher
crystallinity
thermal
stability
than
attributed
to
a
degree
crosslinking
greater
content
dark
sulfur.
Mechanical
testing
showed
exhibits
superior
compressional
flexural
strengths,
enhanced
Young's
modulus
Shore
hardness,
compared
.
Notably,
mechanical
strength
parameters
for
are
comparable
those
C62
class
bricks
used
in
construction
applications.
These
findings
suggest
that
composites,
particularly
incorporating
syringol,
can
provide
viable
alternatives
traditional
materials
various
applications,
contributing
waste
sustainable
science.
