Encyclopedia of Polymer Science and Technology,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 28
Published: Nov. 30, 2024
Abstract
This
article
provides
an
overview
of
depolymerization
from
a
thermodynamic
and
kinetic
perspective.
Depolymerization
is
characterized
by
the
scission
main
chain
backbone.
Three
types
reactions
such
as
random
degradation,
depolymerization,
weak‐link
degradation
may
occur
separately
or
in
conjunction
with
each
other.
The
treatment
processes
has
been
described
case
depolymerization.
their
energetic
features
heat,
entropy,
free
energy
for
polymerization,
bond‐dissociation
energy,
activation
energy.
Current
applications
are
found
various
fields
biological
recycling
(biorecycling),
chemical
recycling,
agricultural
uses
natural
environment,
medical
uses.
ACS Macro Letters,
Journal Year:
2025,
Volume and Issue:
unknown, P. 235 - 240
Published: Feb. 10, 2025
Although
thermal
solution
RAFT
depolymerization
has
recently
emerged
as
an
efficient
chemical
recycling
methodology,
current
approaches
require
specialized
solvents
(i.e.,
dioxane),
typically
suffer
from
extended
reaction
times,
and
operate
exclusively
under
highly
dilute
conditions
5
mM
repeat
unit
concentration).
To
circumvent
these
limitations,
a
commercial
radical
initiator
is
introduced
to
kinetically
untrap
the
promote
chain-end
activation.
By
varying
concentration,
remarkable
rate
acceleration
(up
72
times
faster)
can
be
observed,
enabling
completion
of
within
min.
Notably,
20-fold
increase
in
concentration
did
not
appreciably
compromise
final
yield,
while
very
high
percentages
monomer
could
recovered
wide
range
solvents,
including
dimethyl
sulfoxide,
anisole,
xylene,
acetonitrile,
toluene,
trichlorobenzene.
Our
findings
only
offer
intriguing
mechanistic
aspects,
but
also
significantly
expand
scope
applications
depolymerization.
ACS Macro Letters,
Journal Year:
2024,
Volume and Issue:
13(7), P. 806 - 811
Published: June 10, 2024
Thermal
solution
depolymerization
is
a
promising
low-temperature
chemical
recycling
strategy
enabling
high
monomer
recovery
from
polymers
made
by
controlled
radical
polymerization.
However,
current
methodologies
predominantly
focus
on
the
of
monofunctional
polymers,
limiting
material
scope
and
pathways.
Herein,
we
report
telechelic
synthesized
RAFT
Notably,
observed
significant
decrease
in
molecular
weight
(Mn)
during
recovery,
which
contrasts
minimal
Mn
shift
polymers.
Introducing
Z
groups
at
center
or
both
ends
polymer
resulted
distinct
kinetic
profiles,
indicating
partial
bifunctional
as
supported
mathematical
modeling.
Remarkably,
featuring
R-terminal
showed
up
to
68%
improvement
overall
conversion
compared
their
analogues,
highlighting
potential
these
materials
circular
economy.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(26), P. 18074 - 18082
Published: June 21, 2024
A
cyclic
thioenone
system
capable
of
controlled
ring-opening
polymerization
(ROP)
is
presented
that
leverages
a
reversible
Michael
addition-elimination
(MAE)
mechanism.
The
monomers
are
easy
to
access
and
modify
for
the
first
time
incorporate
dynamic
reversibility
MAE
with
chain-growth
polymerization.
This
strategy
features
mild
conditions,
tunable
functionalities,
molecular
weights
(
Reviews in Chemical Engineering,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 3, 2025
Abstract
Epoxy
foam/aerogel
materials
(EP-AGs)
have
potential
in
the
aerospace,
construction,
and
energy
industries,
allowing
development
of
lightweight
high-performance
products
for
a
wide
range
applications.
Research
interest
developing
EP-AGs
is
increasing
as
it
has
to
create
greener
more
sustainable
making
various
products.
Several
commercial
applications
techniques
creating,
processing,
drying
them
already
been
reported.
The
introduction
into
value-added
one
most
promising
options
but
suffers
from
lack
knowledge
about
relationships
between
microstructure
properties.
current
obstacles
their
use
industrial
sector
challenges
related
factory
scale-up
are
also
taken
account.
hindered
by
critical
gaps
applicational
processing
complexity,
such
scaling
up
laboratory
large-scale
production,
optimizing
synthesis
techniques,
standardized
testing
protocols.
review
focuses
on
complexities
further
difficulties
associated
with
improve
casting
burdens,
cost-effectiveness,
accessibility
This
examines
synthesizing
used
make
special
materials,
practices,
technological
barriers
would
face.
Journal of Polymer Science,
Journal Year:
2024,
Volume and Issue:
62(21), P. 4921 - 4927
Published: April 25, 2024
Abstract
Low‐strain
cyclic
olefin
monomers,
including
five‐membered,
six‐membered,
eight‐membered,
and
macrocyclic
rings,
have
been
recently
exploited
for
the
synthesis
of
depolymerizable
polyolefins
via
ring‐opening
metathesis
polymerization
(ROMP).
Such
can
undergo
ring‐closing
depolymerization
(RCMD)
to
regenerate
their
original
monomers.
Nevertheless,
behavior
prepared
by
ROMP
seven‐membered
olefins,
an
important
class
low‐strain
still
remains
unexplored.
In
this
study,
we
demonstrate
chemical
recycling
polyheptenamers
cycloheptene
under
standard
RCMD
conditions.
Highly
efficient
polyheptenamer
was
enabled
Grubbs'
second‐generation
catalyst
in
toluene.
It
observed
that
monomer
yields
increased
when
temperature
starting
polymer
concentration
reduced.
A
near‐quantitative
regeneration
(>96%)
achieved
within
1
h
dilute
conditions
(20
mM
olefins)
at
60°C.
Moreover,
exhibited
a
decomposition
above
430°C,
highlighting
its
potential
as
new
thermally
stable
chemically
recyclable
materials.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 17, 2025
The
sustainable
management
of
polydiene
waste
represents
a
formidable
challenge
in
the
realm
polymer
chemistry,
given
extensive
industrial
utilization
polydienes
due
to
their
superior
elastomeric
properties.
This
comprehensive
Perspective
addresses
multifaceted
obstacles
hindering
efficient
recycling
polydienes,
encompassing
environmental
concerns,
technical
limitations,
and
economic
disincentives.
We
systematically
dissect
influence
polydienes'
chemical
structures
on
recyclability,
tracing
evolution
disposal
practices
while
assessing
current
landscape
strategies.
Our
investigation
reveals
primary
challenges
associated
with
recycling,
notably
energy-intensive
nature
modification
processes
detriments
prevailing
techniques.
Furthermore,
we
critically
evaluate
existing
methodologies─including
mechanical
energy
recovery,
recycling─highlighting
respective
merits,
constraints,
implications.
Pioneering
advancements
technology,
such
as
topochemical
polymerization
computational
prediction
models,
are
spotlighted
for
potential
revolutionize
recycling.
Looking
forward,
delineate
an
optimistic
trajectory
management,
advocating
innovative
methods,
exploration
milder
conditions,
adoption
interdisciplinary
approaches
bolster
efficiency.
culminates
discussion
pivotal
role
policy
frameworks,
life
cycle
assessments,
analyses
shaping
future
Through
this
scholarly
examination,
aim
catalyze
further
research
development
efforts
aimed
at
mitigating
impact
waste,
thereby
contributing
broader
objective
chemistry.
