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.
Macromolecules,
Год журнала:
2022,
Номер
55(2), С. 595 - 607
Опубликована: Янв. 5, 2022
Epoxy
vitrimers
with
dynamic
covalent
networks
enable
reprocessing
and
recycling
of
epoxy
thermosets.
However,
achieving
high
mechanical
performance
remains
a
challenge.
In
this
work,
ferulic
acid-based
hyperbranched
resin
(FEHBP)
was
synthesized
to
produce
closed-loop
recyclable
catalyst-free
without
compromising
its
thermal
properties.
The
incorporation
FEHBP
topological
structure
improved
the
tensile
strength,
modulus,
toughness
through
an
in
situ
reinforcing
toughening
mechanism.
hydroxyls
catalyzed
transesterification
accelerated
vitrimers.
Thus,
obtained
demonstrated
excellent
weldability,
malleability,
programmability.
10
phr
exhibited
strength
(126.4
MPa),
usable
Tg
(94
°C),
fast
stress
relaxation
(a
time
45
s
at
140
°C)
retention
(above
88.3%)
upon
recycling.
degradation
products
were
reused
new
under
mild
conditions
similar
properties
stability
as
original
vitrimers,
leading
recyclable,
fully
bio-based
potential
for
industrial
applications.
ChemSusChem,
Год журнала:
2021,
Номер
14(19), С. 4007 - 4027
Опубликована: Июнь 16, 2021
Plastic
waste,
which
is
one
of
the
major
sources
pollution
in
landfills
and
oceans,
has
raised
global
concern,
primarily
due
to
huge
production
rate,
high
durability,
lack
utilization
available
waste
management
techniques.
Recycling
methods
are
preferable
reduce
impact
plastic
some
extent.
However,
most
recycling
techniques
associated
with
different
drawbacks,
cost
downgrading
product
quality
being
among
notable
ones.
The
sustainable
option
here
upcycle
create
high-value
materials
compensate
for
production.
Several
upcycling
constantly
investigated
explored,
currently
only
economical
resolve
issue.
This
Review
provides
a
comprehensive
insight
on
promising
chemical
routes
widely
used
mixed
wastes.
challenges
inherent
these
processes,
recent
advances,
significant
role
science
research
community
resolving
issues
further
emphasized.
Chemical Reviews,
Год журнала:
2024,
Номер
124(12), С. 7829 - 7906
Опубликована: Июнь 3, 2024
Covalent
network
polymers,
as
materials
composed
of
atoms
interconnected
by
covalent
bonds
in
a
continuous
network,
are
known
for
their
thermal
and
chemical
stability.
Over
the
past
two
decades,
these
have
undergone
significant
transformations,
gaining
properties
such
malleability,
environmental
responsiveness,
recyclability,
crystallinity,
customizable
porosity,
enabled
development
integration
dynamic
chemistry
(DCvC).
In
this
review,
we
explore
innovative
realm
polymers
focusing
on
recent
advances
achieved
through
application
DCvC.
We
start
examining
history
fundamental
principles
DCvC,
detailing
its
inception
core
concepts
noting
key
role
reversible
bond
formation.
Then
reprocessability
DCvC
is
thoroughly
discussed,
starting
from
milestones
that
marked
evolution
progressing
to
current
trends
applications.
The
influence
crystallinity
then
reviewed,
covering
diversity,
synthesis
techniques,
functionalities.
concluding
section,
address
challenges
faced
field
speculates
potential
future
directions.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2023,
Номер
11(30), С. 11077 - 11087
Опубликована: Июль 18, 2023
Dynamic
covalent
polymer
networks
represent
new
opportunities
in
the
design
of
sustainable
epoxy
resins
due
to
their
excellent
malleability
and
reprocessability;
however,
adaptable
network
is
usually
accompanied
by
low
glass
transition
temperature,
poor
creep
resistance,
mechanical
brittleness.
Herein,
we
demonstrate
a
vanillin-based
hyperbranched
resin
(VEHBP)
containing
disulfide
imine
dynamic
bonds
for
recyclable
malleable
with
high
temperature
(Tg),
significantly
improved
properties.
The
5%VEHBP
exhibited
175
°C
130
34.1,
19.7,
173.3%
increase
tensile
strength,
storage
modulus,
toughness
respectively,
compared
neat
resin.
Meanwhile,
topological
structure
VEHBP
complemented
dual
endowed
these
materials
self-healing
ability,
reprocessability,
degradability,
which
represents
an
important
step
toward
fabrication
high-performance
networks.
Chemical Science,
Год журнала:
2023,
Номер
14(20), С. 5243 - 5265
Опубликована: Янв. 1, 2023
This
review
provides
a
multidisciplinary
overview
of
the
challenges
and
opportunities
for
dynamic
covalent
chemistry-based
macromolecules
towards
design
new,
sustainable,
recyclable
materials
circular
economy.
Chemical Reviews,
Год журнала:
2024,
Номер
124(13), С. 8473 - 8515
Опубликована: Июнь 27, 2024
A
powerful
toolbox
is
needed
to
turn
the
linear
plastic
economy
into
circular.
Development
of
materials
designed
for
mechanical
recycling,
chemical
and/or
biodegradation
in
targeted
end-of-life
environment
are
all
necessary
puzzle
pieces
this
process.
Polyesters,
with
reversible
ester
bonds,
already
forerunners
circularity:
poly(ethylene
terephthalate)
(PET)
most
recycled
material
suitable
and
while
common
aliphatic
polyesters
biodegradable
under
favorable
conditions,
such
as
industrial
compost.
However,
circular
design
needs
be
further
tailored
different
options
enable
recycling
greener
conditions
rapid
enough
even
less
environmental
conditions.
Here,
we
discuss
molecular
polyester
chain
targeting
enhancement
circularity
by
incorporation
more
easily
hydrolyzable
additional
dynamic
or
degradation
catalyzing
functional
groups
part
chain.
The
utilization
replacement
current
volume
plastics
also
reviewed
well
embedment
green
catalysts,
enzymes
matrices
facilitate
Journal of Polymer Science,
Год журнала:
2021,
Номер
60(1), С. 7 - 31
Опубликована: Ноя. 5, 2021
Abstract
Publications
on
polyethylene
terephthalate
(PET)
continue
to
increase
including
the
number
of
publications
recycling.
PET
is
a
versatile
material
with
ability
be
remade
from
its
polymer
state
through
mechanical
recycling
and
even
back
original
monomer
advanced
The
scale
PET's
use
affords
continued
research
applications
in
improved
new
uses
discarded
clean
convert
it
into
many
forms
alternative
materials
are
expanding
an
attempt
complete
circular
or
improve
end
life.
As
indicated
life
cycle
assessment
studies,
increases
lower
energy
required
manufacture
products.
future
for
will
reduce
demands
further
largest
breakthroughs
technologies
bio‐sourced
resins
trending
toward
zero
carbon
negative
solutions.
Opportunities
remain
improvement
light
weighting.
testing
resins,
development
bio‐feedstocks,
improvements
engineering,
processing,
recycling,
design
provide
benefits.
This
review
provides
context
these
developments.
Macromolecules,
Год журнала:
2021,
Номер
54(18), С. 8423 - 8434
Опубликована: Сен. 14, 2021
Covalent
adaptable
networks
(CANs)
represent
a
transition
material
combining
favorable
features
of
thermosets
and
thermoplastics.
However,
it
is
still
huge
challenge
to
simultaneously
achieve
fast
reprocessability
high
performance
for
CANs.
Here,
we
designed
catechol-based
acetal
CANs
continuous
reprocessing
without
sacrificing
thermal
mechanical
properties.
A
small-molecule
model
study
demonstrated
the
significantly
accelerated
exchange
by
neighboring
group
participation
(NGP)
phenolic
hydroxyl.
Using
this
internally
catalyzed
chemistry,
series
with
broad
range
properties
were
simply
prepared
from
bio-based
epigallocatechin
gallate
(EGCG)
tri(ethylene
glycol)
divinyl
ether
(TEGVE)
via
one-step
"click"
cross-linking
using
catalysts
or
releasing
byproducts.
The
dynamic
nature
was
confirmed
stress
relaxation
multiple
recycling
methods
including
extrusion.
While
dense
cross-link
density
rigidity
network
provided
solvent
resistance
This
work
provides
promising
practical
method
produce
fast-reprocessing
covalent
polymer
superior
performance.
The
sustainability
of
current
and
future
plastic
materials
is
a
major
focus
basic
research,
industry,
government,
society
at
large.
There
general
recognition
the
positive
impacts
plastics,
especially
packaging;
however,
negative
consequences
around
end-of-life
outcomes
overall
circularity
are
issues
that
must
be
addressed.
In
this
perspective,
we
highlight
some
challenges
associated
with
many
uses
components
diversity
needed
to
satisfy
consumer
demand,
several
examples
focused
on
plastics
packaging.
We
also
discuss
opportunities
provided
by
conventional
advanced
recycling/upgrading
routes
petrochemical
bio-based
feedstocks,
along
overviews
chemistry-related
(experimental,
computational,
data
science,
traceability)
approaches
valorization
polymers
toward
closed-loop
environment.
