Türk doğa ve fen dergisi :/Türk doğa ve fen dergisi,
Год журнала:
2023,
Номер
12(4), С. 81 - 85
Опубликована: Дек. 28, 2023
The
study
investigates
the
thermal,
kinetic,
and
dielectric
properties
of
a
novel
methacrylate
polymer
synthesized
from
naphthol-containing
cinnamic
acid
derivative.
Notably,
glass
transition
temperature
(Tg)
polymer,
crucial
parameter
for
amorphous
polymers,
was
found
to
be
significantly
higher
than
traditional
owing
presence
naphthol
group
within
structure.
research
also
delves
into
thermal
stability
activation
energy
using
analysis
techniques.
Additionally,
homopolymer
were
explored
with
focus
on
temperature-dependent
changes
in
constant
its
behavior
varying
frequencies.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Март 20, 2024
Abstract
Only
a
small
proportion
of
global
plastic
waste
is
recycled,
which
most
mechanically
recycled
into
lower
quality
materials.
The
alternative,
chemical
recycling,
enables
renewed
production
pristine
materials,
but
generally
comes
at
high
energy
cost,
particularly
for
processes
like
pyrolysis.
This
review
focuses
on
light-driven
approaches
chemically
recycling
and
upcycling
waste,
with
emphasis
reduced
consumption
selective
transformations
not
achievable
heat-driven
methods.
We
focus
challenging
to
recycle
backbone
structures
composed
mainly
C‒C
bonds,
lack
functional
groups
i.e.,
esters
or
amides,
that
facilitate
e.g.,
by
solvolysis.
discuss
the
use
light,
either
in
conjunction
heat
drive
depolymerization
monomers
via
photocatalysis
transform
polymers
valuable
molecules.
structural
prerequisites
these
are
outlined,
highlighting
their
advantages
as
well
limitations.
conclude
an
outlook,
addressing
key
challenges,
opportunities,
provide
guidelines
future
photocatalyst
(PC)
development.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(19)
Опубликована: Март 11, 2024
Abstract
Photocatalytic
upcycling
and
depolymerization
of
vinyl
polymers
have
emerged
as
promising
strategies
to
combat
plastic
pollution
promote
a
circular
economy.
This
mini
review
critically
summarizes
current
developments
in
the
degradation
including
polystyrene
poly(meth)acrylates.
Of
these
material
classes,
polymethacrylates
possess
unique
possibility
undergo
photocatalytic
back
monomer
under
thermodynamically
favourable
conditions,
thus
presenting
significant
advantages
over
traditional
thermal
strategies.
Our
perspective
on
formidable
challenges
potential
future
directions
are
also
discussed.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(33)
Опубликована: Июнь 26, 2023
In
this
work,
we
achieved
a
triggering
degradation
of
polymers
composed
carbon-carbon
(C-C)
bonded
backbone
without
relying
on
introduction
labile
heteroatom-based
bond.
The
crucial
point
for
the
achievement
is
using
vinyl
ether
(VE)
as
comonomer
in
radical
copolymerization
(meth)acrylate
carbon-hydrogen
(C-H)
bonds
active
photocatalyzed
hydrogen
atom
transfer
(HAT)
triggers
pendant.
Interestingly,
methyl
methacrylate
(MMA)-n-butyl
(NBVE)
copolymer
underwent
acetonitrile
presence
benzophenone
(Ph2
CO)
under
UV
irradiation
at
80
°C.
did
not
take
place,
when
any
one
UV,
Ph2
CO,
heat,
and
NBVE
unit
was
removed
or
HAT-active
solvent
such
toluene
1,4-dioxane
used.
These
control
experiments
strongly
supported
HAT-triggering
degradation.
Furthermore,
behaviors
copolymers
with
other
ethers
tert-butyl
isopropenyl
indicated
that
C-H
bond
neighboring
to
oxygen
pendant
mainly
responsible
trigger
leading
also
demonstrated
even
acrylate-based
copolymer.
Macromolecules,
Год журнала:
2024,
Номер
57(11), С. 5368 - 5379
Опубликована: Май 29, 2024
Topology
significantly
impacts
polymer
properties
and
applications.
Hyperbranched
polymers
(HBPs)
synthesized
via
atom
transfer
radical
polymerization
(ATRP)
using
inimers
typically
exhibit
broad
molecular
weight
distributions
limited
control
over
branching.
Alternatively,
copolymerization
of
inibramers
(IB),
such
as
α-chloro/bromo
acrylates
with
vinyl
monomers,
yields
HBPs
precise
uniform
Herein,
we
described
the
synthesis
hydrophilic
HB
polyacrylates
in
water
by
copolymerizing
a
water-soluble
IB,
oligo(ethylene
oxide)
methyl
ether
2-bromoacrylate
(OEOBA),
various
acrylate
comonomers.
Visible-light-mediated
controlled
branching
(CRBP)
dual
catalysis
eosin
Y
(EY)
copper
complexes
resulted
weights
(Mn
=
38
000
to
170
000)
degrees
(2%–24%).
Furthermore,
optimized
conditions
enabled
successful
application
OEOBA
synthesize
linear-hyperbranched
block
copolymers
hyperbranched
protein
hybrids
(HB-PPH),
demonstrating
its
potential
advance
complex
macromolecular
architecture
under
environmentally
benign
conditions.
Copolymerization
methacrylate
monomer,
(OEOMA500),
inibramer
was
accompanied
fragmentation
β-carbon
C–C
bond
scission
subsequent
growth
chains
from
fragments.
computational
studies
investigating
depending
on
IB
comonomer
structure
supported
experimental
observations.
This
work
expands
toolkit
for
CRBP
highlights
critical
influence
reaction
outcomes.
Angewandte Chemie,
Год журнала:
2024,
Номер
136(19)
Опубликована: Март 11, 2024
Abstract
Photocatalytic
upcycling
and
depolymerization
of
vinyl
polymers
have
emerged
as
promising
strategies
to
combat
plastic
pollution
promote
a
circular
economy.
This
mini
review
critically
summarizes
current
developments
in
the
degradation
including
polystyrene
poly(meth)acrylates.
Of
these
material
classes,
polymethacrylates
possess
unique
possibility
undergo
photocatalytic
back
monomer
under
thermodynamically
favourable
conditions,
thus
presenting
significant
advantages
over
traditional
thermal
strategies.
Our
perspective
on
formidable
challenges
potential
future
directions
are
also
discussed.
Macromolecules,
Год журнала:
2025,
Номер
58(5), С. 2210 - 2223
Опубликована: Фев. 18, 2025
Polymeric
materials
have
become
indispensable
due
to
their
versatility
and
low
cost,
yet
environmental
impact
presents
a
significant
global
challenge.
Traditional
chemical
recycling
methods
typically
rely
on
heat
as
stimulus;
for
instance,
pyrolysis
is
popular
methodology
which
faces
limitations
high
energy
consumption,
product
selectivity,
the
generation
of
undesirable
byproducts.
In
response,
recent
advances
in
promotion
depolymerization
degradation
through
alternative
stimuli
such
light,
electrochemistry,
mechanical
force,
shown
promising
potential
more
efficient
selective
polymer
breakdown,
yielding
either
starting
monomers
or
valuable
small
molecules.
This
perspective
explores
key
examples
these
emerging
strategies,
highlighting
improve
upon
current
protocols
offer
pathways
under
milder
conditions,
while
identifying
challenges
that
future
research
must
address
translate
chemistry
into
viable
broadly
applicable
strategies.
Only
a
small
proportion
of
global
plastic
waste
is
recycled,
which
most
mechanically
recycled
into
lower
quality
materials.
The
alternative,
chemical
recycling,
enables
renewed
production
pristine
materials,
but
generally
comes
at
high
energy
cost,
particularly
for
processes
like
pyrolysis.
This
review
focuses
on
light-driven
approaches
chemically
recycling
and
upcycling
waste,
with
emphasis
reduced
consumption
selective
transformations
not
achievable
heat-driven
methods.
We
focus
challenging
to
recycle
backbone
structures,
mainly
C‒C,
lack
functional
groups
i.e.
esters
or
amides,
that
facilitate
e.g.
by
solvolysis.
discuss
the
use
light,
either
in
conjunction
heat
drive
depolymerization
monomers
via
photocatalysis
transform
polymers
valuable
molecules.
structural
prerequisites
these
are
outlined,
highlighting
their
advantages
as
well
limitations.
conclude
an
outlook,
addressing
key
challenges,
opportunities,
provide
guidelines
future
photocatalyst
development.
Angewandte Chemie,
Год журнала:
2023,
Номер
135(33)
Опубликована: Июнь 26, 2023
Abstract
In
this
work,
we
achieved
a
triggering
degradation
of
polymers
composed
carbon‐carbon
(C−C)
bonded
backbone
without
relying
on
introduction
labile
heteroatom‐based
bond.
The
crucial
point
for
the
achievement
is
using
vinyl
ether
(VE)
as
comonomer
in
radical
copolymerization
(meth)acrylate
carbon‐hydrogen
(C−H)
bonds
active
photocatalyzed
hydrogen
atom
transfer
(HAT)
triggers
pendant.
Interestingly,
methyl
methacrylate
(MMA)‐
n
‐butyl
(NBVE)
copolymer
underwent
acetonitrile
presence
benzophenone
(Ph
2
CO)
under
UV
irradiation
at
80
°C.
did
not
take
place,
when
any
one
UV,
Ph
CO,
heat,
and
NBVE
unit
was
removed
or
HAT‐active
solvent
such
toluene
1,4‐dioxane
used.
These
control
experiments
strongly
supported
HAT‐triggering
degradation.
Furthermore,
behaviors
copolymers
with
other
ethers
tert
isopropenyl
indicated
that
C−H
bond
neighboring
to
oxygen
pendant
mainly
responsible
trigger
leading
also
demonstrated
even
acrylate‐based
copolymer.
