Processes,
Journal Year:
2023,
Volume and Issue:
11(4), P. 1033 - 1033
Published: March 29, 2023
Styrene-butadiene
(SBR)
and
acrylonitrile-butadiene
(NBR)
rubber
blends
with
tetramethyl
thiuram
disulfide
(TMTD)
monosulfide
(TMTS)
accelerators
environmentally
friendly
plasticizers,
obtained
from
PET
recycling
biobased
resources
(LA/PG/PET/EG/LA),
were
prepared.
The
mechanical
properties
of
the
products
tested
compared
those
commercial
dioctyl
terephthalate
(DOTP).
TMTS
was
prepared
by
simple
efficient
one-pot
synthesis
dimethylamine,
carbon
disulfide,
potassium
cyanide,
ammonium
chloride
as
catalysts
in
recycled
isopropanol/water
azeotrope
solvent.
In
a
comparative
study,
methoxide,
ethoxide,
iodide,
amide
ions
also
used.
two-step
reaction
mechanism
involves
oxidation
amine
salt
dimethyldithiocarbamic
acid
to
TMTD
hydrogen
peroxide
sulfur
elimination
bond.
Potassium
cyanide
appears
be
most
nucleophile.
simplicity
operation,
mild
conditions,
solvent
recycling,
high
yields,
applicability
industrial
level
are
advantages
this
process.
Shore
hardness,
tensile
strength,
compression
test
results
vulcanized
before
after
aging
showed
similar
for
both
accelerators,
while
somewhat
better
LA/PG/PET/EG/LA
plasticizer.
ACS Applied Nano Materials,
Journal Year:
2023,
Volume and Issue:
6(19), P. 18403 - 18412
Published: Sept. 26, 2023
Recently,
carbon-based
nanomaterials
have
attracted
significant
attention
as
promising
metal-free
nanocatalysts
for
activating
persulfates
in
wastewater
treatment
via
nonradical
oxidative
pathways
(1O2
and
electron
transfer).
Herein,
a
series
of
N-doped
carbon
nanosponges
been
designed
synthesized
by
calcination
organic
porphyrins
efficient
peroxymonosulfate
(PMS)
on
acid
orange
7
(AO7)
degradation
pathway.
In
this
work,
the
key
point
strategy
is
choice
substituent
groups
(including
–OH,
–COOH,
–NO2)
5,10,15,20-tetraphenylporphyrin
(TPP),
which
could
serve
both
heteroatom-doped
source
morphological
conditioning
agent.
Further
studies
reveal
that
doping
N
atom
greatly
improve
their
catalytic
performance
PMS
AO7
regulating
morphology
physicochemical
properties.
The
quenching
tests
EPR
analysis
verified
1O2,
contributed
to
74.0%
total
degradation,
selectively
produced
from
TPP-NO2-800/PMS
system
without
any
radicals
(e.g.,
SO4•–,
O2•–,
HO•).
minor
contribution
(26.0%)
elimination
probably
attributed
transfer
between
PMS.
Processes,
Journal Year:
2023,
Volume and Issue:
11(4), P. 1033 - 1033
Published: March 29, 2023
Styrene-butadiene
(SBR)
and
acrylonitrile-butadiene
(NBR)
rubber
blends
with
tetramethyl
thiuram
disulfide
(TMTD)
monosulfide
(TMTS)
accelerators
environmentally
friendly
plasticizers,
obtained
from
PET
recycling
biobased
resources
(LA/PG/PET/EG/LA),
were
prepared.
The
mechanical
properties
of
the
products
tested
compared
those
commercial
dioctyl
terephthalate
(DOTP).
TMTS
was
prepared
by
simple
efficient
one-pot
synthesis
dimethylamine,
carbon
disulfide,
potassium
cyanide,
ammonium
chloride
as
catalysts
in
recycled
isopropanol/water
azeotrope
solvent.
In
a
comparative
study,
methoxide,
ethoxide,
iodide,
amide
ions
also
used.
two-step
reaction
mechanism
involves
oxidation
amine
salt
dimethyldithiocarbamic
acid
to
TMTD
hydrogen
peroxide
sulfur
elimination
bond.
Potassium
cyanide
appears
be
most
nucleophile.
simplicity
operation,
mild
conditions,
solvent
recycling,
high
yields,
applicability
industrial
level
are
advantages
this
process.
Shore
hardness,
tensile
strength,
compression
test
results
vulcanized
before
after
aging
showed
similar
for
both
accelerators,
while
somewhat
better
LA/PG/PET/EG/LA
plasticizer.
