ACS Applied Materials & Interfaces,
Год журнала:
2022,
Номер
14(40), С. 45966 - 45977
Опубликована: Сен. 27, 2022
Because
of
its
rather
low
melt
strength,
polylactide
(PLA)
has
yet
to
fulfill
promise
as
advanced
biobased
and
biodegradable
foams
replace
fossil-based
polymer
foams.
In
this
work,
PLA
vitrimers
were
prepared
by
two-step
reactive
processing
from
commercial
thermoplastics,
glycerol,
diphenylmethane
diisocyanate
(MDI)
using
Zn(II)-catalyzed
addition
transesterification
chemistry.
The
reaction
glycerol
occurs
with
zinc
acetate
the
catalyst,
chain
scission
will
take
place
due
alcoholysis
chains
free
hydroxyl
groups
glycerol.
Long-chain
can
be
obtained
then
cross-linked
MDI.
Rheological
analysis
shows
that
formed
network
significantly
improve
strength
promote
strain
hardening
under
extensional
flow.
still
maintain
ability
thermoplastic
via
extrusion
compression.
enhanced
rearrangement
topology
facilitate
foaming
processing.
An
expansion
ratio
large
49.2-fold
microcellular
foam
a
uniform
cell
morphology
for
gel
fraction
51.8%
through
supercritical
carbon
dioxide
technique.
This
work
provides
new
way
scale-up
possibility
enhance
PLA,
broadened
range
applicability
brought
is
truly
valuable
in
terms
realization
sustainable
society.
Polymers,
Год журнала:
2022,
Номер
14(22), С. 4788 - 4788
Опубликована: Ноя. 8, 2022
Plastic
waste
pollution,
including
non-biodegradable
landfills,
leaching
of
toxic
chemicals
into
soil
and
waterways,
emission
gases
the
atmosphere,
is
significantly
affecting
our
environment.
Conventional
plastic
recycling
approaches
generally
produce
lower
value
materials
compared
to
original
or
recover
inefficient
heat
energy.
Lately,
upcycling
valorization
approach
has
emerged
as
a
sustainable
solution
transform
value-added
products.
In
this
review,
we
present
an
overview
recent
advancements
in
upcycling,
such
vitrimerization,
nanocomposite
fabrication,
additive
manufacturing,
catalytic
transformation,
industrial
biotechnology,
envisaged
with
technical
challenges,
future
developments,
new
circular
economy
opportunities.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2023,
Номер
11(5), С. 1974 - 1984
Опубликована: Янв. 27, 2023
We
reported
a
catalyst-free
technique
to
fabricate
transesterification-based
poly(ethylene
terephthalate)
(PET)
vitrimers
via
melt
reacting
PET
with
N,N′-tetraglycidyldiaminodiphenyl
methane
(TGDDM)
in
several
minutes.
investigated
the
effect
of
TGDDM
content
on
reaction
mechanism
and
chemical
structure
final
products
detail.
At
low
(≤0.5
wt
%),
branched
thermoplastic
was
obtained
by
chain-extension
between
carboxyl
groups
epoxy
TGDDM.
medium
(0.7–1.0
relatively
cross-link
density
were
achieved
through
cross-linking
original
plus
hydroxyl
high
(1.2–2.0
soluble
chain-extended
first
formed
part
TGDDM,
then
after
excess
consumed
newly
functional
groups,
which
generated
thermal
decomposition
ester
under
catalyzation
tertiary
amines
moieties.
The
cross-linked
network
endowed
enhanced
heat
resistance
creep
resistance.
could
relax
stress
rapidly
showed
excellent
processability
weldability,
owing
fast
transesterification
internal
amines.
believe
that
facile
fabrication
great
potentiality
for
upcycling
into
large-scale
production.
Macromolecules,
Год журнала:
2023,
Номер
56(5), С. 1747 - 1758
Опубликована: Март 2, 2023
We
are
facing
a
rapidly
growing
plastic
pollution
crisis,
which
is
adversely
affecting
communities
and
ecosystems
across
the
globe.
Polymer
scientists
have
an
urgent
obligation
to
develop
implement
strategies
for
reutilizing
waste
streams
instead
of
continually
relying
on
virgin
feedstocks
in
manufacturing.
Postconsumer
postindustrial
items
should
be
treated
as
valuable
resources
discarding
them.
In
order
do
this,
technological
outlets
must
developed
produce
renewed
materials
using
input.
Polyesters
represent
one
largest
because
they
commonly
used
single-use
beverage
food
containers
well
textiles.
also
ideal
candidates
exploit
through
chemical
diversification,
owing
wide
variety
functional
derivatives
that
can
synthetically
accessed
via
ester
reactivity.
This
work
highlights
some
recent
developments
related
diversifying
polyester
waste,
with
focus
poly(ethylene
terephthalate)
(PET)
stream.
The
encompass
production
both
small
molecules
prepared
degradation
PET
high-performance
polymeric
scaffolds
derived
from
reactions
PET.
Taking
ingenuity
into
consideration,
based
these
developments,
outlook
provided
future
streams.
What
next
steps
needed?
Where
trends
headed?
gaps
still
exist,
particularly
respect
assessment
sustainability
life
cycle
analysis?
Collectively
considering
examples
highlighted
here,
there
great
promise
field
value-added
materials.
Journal of Materials Chemistry A,
Год журнала:
2023,
Номер
11(20), С. 10912 - 10926
Опубликована: Янв. 1, 2023
Considering
that
environmental
friendliness
and
energy
conservation
are
becoming
crucial,
it
is
urgent
to
advance
the
sustainability
of
materials
in
terms
their
lifecycle,
including
synthesis,
processing,
application.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(31)
Опубликована: Май 20, 2024
Dithioacetals
are
heavily
used
in
organic,
material
and
medical
chemistries,
exhibit
huge
potential
to
synthesize
degradable
or
recyclable
polymers.
However,
the
current
synthetic
approaches
of
dithioacetals
polydithioacetals
overwhelmingly
dependent
on
external
catalysts
organic
solvents.
Herein,
we
disclose
a
catalyst-
solvent-free
acetal-thiol
click-like
reaction
for
synthesizing
polydithioacetals.
High
conversion,
higher
than
acid
catalytic
reaction,
can
be
achieved.
universality
was
confirmed
by
monitoring
reactions
linear
cyclic
acetals
(including
renewable
bio-sourced
furan-acetal)
with
aliphatic
aromatic
thiols,
mechanism
monomolecular
nucleophilic
substitution
(S
Abstract
Plastics
have
revolutionized
our
lives;
however,
the
exponential
growth
of
their
usage
has
led
to
a
global
crisis.
More
sustainable
strategies
are
needed
address
this
dilemma
and
transform
plastics
economy
from
linearity
circular
model.
Herein,
we
systematically
summarize
recent
progress
in
renewable
energy‐driven
plastic
conversion
strategies,
including
photocatalysis,
electrocatalysis,
integration.
By
introducing
significant
works,
design
principles,
mechanisms,
system
regulations,
decipher
compare
various
aspects
conversion.
These
approaches
show
high
reactivity
selectivity
under
environmentally
benign
conditions
provide
alternative
reaction
pathways
for
Plastic
upcycling
as
chemical
feedstock
can
yield
value‐added
chemicals
fuels,
contributing
establishment
economy.
Additionally,
several
innovations
engineering
designs
presented.
Finally,
challenges
perspectives
technologies
comprehensively
discussed.
Macromolecules,
Год журнала:
2021,
Номер
54(22), С. 10381 - 10387
Опубликована: Окт. 20, 2021
The
controllable
introduction
of
dynamical
chemical
cross-linking
into
polymers
permits
the
development
recyclable
polymer
products
with
high
performance.
However,
challenges
lie
in
chemically
inert
polyolefins,
which
are
largest
product
world
to
date.
Here,
we
demonstrate
preparation
polyolefin
elastomers
(POEs)
tunable
dynamic
cross-linking,
compatible
their
industrial
production.
Boronic
ester
bond
cross-linked
POEs
(BPOEs)
present
mechanical
performances
tensile
strength
(σ)
up
23.8
MPa,
Young's
modulus
(E)
29.0
and
toughness
(UT)
69.6
MJ·m–3,
far
superior
those
reported
elastomers.
BPOEs
also
good
thermal
stability
maintaining
a
steady
storage
plateau
2.9
MPa
above
100
°C,
instead
0.2
for
pristine
POEs.
After
reprocessing
three
times,
show
reprocessability
σ
recovery
85.6%,
an
E
108.5%,
UT
95.7%,
elongation
at
break
(ε)
97.1%,
even
higher
than
that
commercial
such
as
POE-8150
Dow
Company.
Our
method
thus
future
higher-performance
other
polyolefins
recyclability.
