Artificial photosynthesis.,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 19, 2024
Semiconductors
harness
the
power
of
light
to
conduct
molecular
transformations,
enabling
photocatalytic
fuel
synthesis,
including
hydrogen
peroxide
from
oxygen.
Despite
well-documented
performances,
dependence
on
critical
raw
materials
in
semiconducting
particles
raises
doubts
regarding
sustainability
processes.
In
recent
years,
there
has
been
an
emerging
trend
utilize
organic
semiconductors,
covalent
frameworks
and
carbon
nitrides
as
heterogeneous
photocatalysts;
however,
their
scalability,
synthetic
conditions,
synthesis
temperatures
hamper
widespread
availability.
Benzoxazine
resins
are
cross-linked
thermosetting
mainly
studied
potential
replacements
for
epoxy
resins.
this
work,
production
employing
benzoxazines
metal-free
polymeric
photocatalysts
is
monitored,
efficiency
by
means
chemical
structure
curing
studied.
Cured
aromatic
benzoxazine
affords
a
higher
performance,
compared
linear
or
uncured
analogues.
International Journal of Molecular Sciences,
Год журнала:
2025,
Номер
26(6), С. 2444 - 2444
Опубликована: Март 9, 2025
A
new
type
of
glass
fiber
(GF)-reinforced
bio-derived
polybenzoxazine
(GF/bio-derived
PBz)
composites
suitable
for
dental
post
applications
was
developed.
The
study
assessed
the
effects
different
quantities
GF
on
mechanical
and
thermal
characteristics,
stability,
flame
resistance
composite
samples.
Additionally,
feasibility
using
GF/bio-derived
PBz
posts
analyzed
through
finite
element
analysis
(FEA).
stress
distribution
in
a
tooth
model
repaired
with
newly
developed
under
oblique
loads
compared
to
models
conventional
gold
alloy
post.
incorporation
GFs
significantly
enhanced
flexural
properties,
samples,
while
also
reducing
expansion
manner
that
closely
matched
dentin.
FEA
derived
from
GF/bio-based
revealed
pattern
comparable
Considering
composite’s
resistance,
its
suitability
as
demonstrated
by
FEA,
holds
significant
promise
use
applications.
Chemistry - An Asian Journal,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 30, 2025
Abstract
Recently,
the
fast
advancement
of
bio‐based
polymers
has
boosted
interest
in
green
and
sustainable
materials.
In
this
context,
polybenzoxazine‐derived
renewable
resources
have
been
widely
investigated
due
to
their
environmental
benefits
high
mechanical
thermal
properties.
This
study
focused
on
synthesizing
hybrid
benzoxazines
from
bio‐phenolic
compounds—
vanillin,
thymol,
carvacrol—
combined
with
Jeffamine
D‐230
paraformaldehyde.
The
chemical
structures
(Van‐JD,
Thy‐JD,
Car‐JD)
were
characterized
by
Fourier
transform
infrared
spectroscopy
(FT‐IR)
nuclear
magnetic
resonance
(
1
H
NMR
13
C
NMR).
Furthermore,
curing
behavior
stability
synthesized
bio‐phenolic‐based
studied
using
differential
scanning
calorimetry
(DSC)
thermogravimetric
analysis
(TGA).
Macromolecules,
Год журнала:
2024,
Номер
58(1), С. 473 - 487
Опубликована: Дек. 19, 2024
A
monofunctional
benzoxazine
with
an
ortho-positioned
hydroxy
group
was
designed
in
attempt
to
obtain
low-curing
monomers
impelled
by
intra-
and
intermolecular
hydrogen
bonds.
set
of
hydroxybenzoxazines
(OHBxR)
synthesized
different
substituents
(R)
on
the
nitrogen
atom
heterocyclic
ring.
The
structure
solid
state
indicates
dimeric
compounds
which
molecules
are
bonded
together
bonds
between
hydroxyl
functional
atoms.
All
showed
lower
curing
temperatures
comparison
adequate
without
functionalization
(OHBxR
<
tBuBxR).
ring-opening
polymerization
for
proceeds
via
pathways
stimulated
bonds,
giving
rise
a
new,
unknown
hydroxy-acetal
type
polybenzoxazine.
crucial
new
stage
modified
polymer
chain
involves
proton
transfer
from
activated
oxygen
open
oxazine
Macromolecular Chemistry and Physics,
Год журнала:
2024,
Номер
unknown
Опубликована: Май 31, 2024
Abstract
Two
disubstituted
bisbenzoxazine
(Bz)
monomers
are
synthesized
using
furan
(Fa)
and
thiophene
(Th)
derivatives:
bis((3‐(furan‐2‐ylmethyl)‐7‐ol‐3,4‐dihydro‐2H‐benzo[e][1,3]
oxazin‐6‐yl)methylene)hydrazine
(BAZ‐Fa‐BZ)
bis((3‐(thiophen‐2‐ylmethyl)‐7‐ol‐3,4‐dihydro‐2H‐benzo[e][1,3]
(BAZ‐Th‐BZ).
These
via
Mannich
condensation
of
salicylaldazine
(1,2‐bis(2,4‐dihydroxybenzylidene)hydrazine
(BAZ─4OH))
paraformaldehyde
(CH
2
O)
n
,
with
furfurylamine
(FacNH
)
thiophene‐2‐methenamine
(Th─NH
),
respectively.
The
chemical
structures
BAZ‐Fa‐BZ
BAZ‐Th‐BZ
affirmed
Fourier‐transform
infrared
spectroscopy
(FTIR)
NMR,
A
thorough
investigation
the
thermal
polymerization
process
is
conducted
differential
scanning
calorimetry
(DSC),
thermogravimetric
analysis
(TGA),
in
situ
FTIR
spectra
(ranging
from
25
to
250
°C).
Poly(BAZ‐Fa‐BZ)
exhibits
superior
properties
a
decomposition
temperature
(
T
d10
402
°C
char
yield
58
wt%
after
treatment
at
°C,
along
lower
surface
free
energy
28.9
mJ
m
−2
compared
poly(BAZ‐Th‐BZ)
=
359
48
wt%,
34.1
).
Additionally,
poly(BAZ‐Th‐BZ/BAZ‐Fa‐BZ)
blend
ratio
1/3
curing
demonstrates
highest
395
60
wt%.
Photoluminescence
(PL)
measurements
solid
state
reveal
that
BAZ‐Th‐BZ,
BAZ‐Fa‐BZ,
their
blends
emit
green
light
when
excited
wavelength
365
nm.
