JACS Au,
Journal Year:
2021,
Volume and Issue:
2(1), P. 3 - 11
Published: Dec. 22, 2021
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.
Macromolecular Rapid Communications,
Journal Year:
2020,
Volume and Issue:
42(3)
Published: Nov. 18, 2020
Abstract
The
global
market
for
3D
printing
materials
has
grown
exponentially
in
the
last
decade.
Today,
photopolymers
claim
almost
half
of
material
sales
worldwide.
lack
sustainable
resins,
applicable
vat
photopolymerization
that
can
compete
with
commercial
materials,
however,
limits
widespread
adoption
this
technology.
development
“green”
alternatives
is
great
importance
order
to
reduce
environmental
impact
additive
manufacturing.
This
paper
reviews
recent
evolutions
field
printing.
It
highlights
synthesis
and
application
biobased
resin
components,
such
as
photocurable
monomers
oligomers,
well
reinforcing
agents
derived
from
natural
resources.
In
addition,
design
biologically
degradable
recyclable
thermoset
products
discussed.
Together,
those
strategies
will
promote
accurate
waste‐free
production
a
new
generation
plastics
economy
near
future.
Macromolecules,
Journal Year:
2022,
Volume and Issue:
55(2), P. 595 - 607
Published: Jan. 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.
Polymers,
Journal Year:
2020,
Volume and Issue:
12(8), P. 1660 - 1660
Published: July 26, 2020
Thermosets
are
known
to
be
very
reliable
polymeric
materials
for
high-performance
and
light-weight
applications,
due
their
retained
dimensional
stability,
chemical
inertia
rigidity
over
a
broad
range
of
temperatures.
However,
once
fully
cured,
they
cannot
easily
reshaped
or
reprocessed,
thus
leaving
still
unsolved
the
issues
recycling
lack
technological
flexibility.
Vitrimers,
introduced
by
Leibler
et
al.
in
2011,
valiant
step
direction
bridging
chasm
between
thermoplastics
thermosets.
Owing
dynamic
covalent
networks,
can
retain
mechanical
stability
solvent
resistance,
but
also
flow
on
demand
upon
heating.
More
generally,
family
Covalent
Adaptable
Networks
(CANs)
is
gleaming
with
astounding
potential,
thanks
huge
variety
chemistries
that
may
enable
bond
exchange.
Arising
from
this
signature
feature,
intriguing
properties
such
as
self-healing,
recyclability
weldability
expand
horizons
thermosets
terms
improved
life-span,
sustainability
overall
enhanced
functionality
versatility.
In
review,
we
present
comprehensive
overview
most
promising
studies
featuring
CANs
vitrimers
specifically,
particular
regard
industrial
applications.
Investigations
into
composites
sustainable
epoxy-based
elastomeric
networks
covered
detail.
Chemistry of Materials,
Journal Year:
2020,
Volume and Issue:
32(17), P. 7105 - 7119
Published: Aug. 3, 2020
Additive
manufacturing
(AM)
is
energizing
the
fields
of
chemistry
and
materials
science
to
develop
new
inks
for
applications
within
such
as
aerospace,
robotics,
healthcare.
AM
enables
fabrication
innumerable
3D
geometries
that
cannot
be
easily
produced
by
other
means.
In
spite
great
promise
an
advanced
form
future
manufacturing,
there
are
still
fundamental
challenges
with
respect
sustainability
need
addressed.
Some
material
needs
include
sustainable
sources
printing
inks,
resins,
filaments,
well
pathways
polymer
recycling,
upcycling,
chemical
circularity.
Furthermore,
combination
biosourced
biodegradable
polymers
additive
could
enable
objects
can
recycled
back
into
feedstock
or
degraded
nontoxic
products
after
they
have
served
their
function.
Herein,
we
review
recent
literature
on
design
field
AM,
a
particular
focus
polymers.
We
also
discuss
some
sustainability-related
emerged
result
technologies.
Macromolecules,
Journal Year:
2021,
Volume and Issue:
54(9), P. 3927 - 3961
Published: April 19, 2021
Vitrimers
constitute
a
fascinating
class
of
polymer
materials
that
make
the
link
between
historically
opposed
3D
networks
(thermosets)
and
linear
polymers
(thermoplastics).
Their
chemical
resistance,
reshaping
ability,
unique
rheological
behavior
upon
heating
them
promising
for
future
applications
in
industry.
However,
many
vitrimers
require
use
high
catalyst
loadings,
which
raises
concerns
their
durability
limits
potential
applications.
To
cope
with
this
issue,
internal
catalysis
neighboring
group
participation
(NGP)
can
be
used
to
enhance
ability
such
materials.
A
few
studies
report
effect
activating
groups
on
exchange
reactions
vitrimers.
Nevertheless,
knowledge
topic
remains
scarce,
although
research
would
greatly
benefit
from
NGP
already
known
organic
chemistry.
The
present
Perspective
presents
different
types
exchangeable
bonds
implemented
discusses
have
or
potentially
capable
an
enhancing
reactions.
This
analysis
is
underpinned
by
thorough
mechanistic
discussion
various
presented.
Macromolecules,
Journal Year:
2022,
Volume and Issue:
55(5), P. 1669 - 1679
Published: Feb. 21, 2022
Vitrimers
are
polymer
networks
in
which
associative
exchange
reactions
can
take
place
under
specific
conditions,
thus
conferring
reprocessability
to
insoluble
materials.
Recently,
catalyst-free
vitrimers
have
emerged
as
a
new
generation
of
able
overcome
potential
leaching,
aging,
and
sintering
issues
catalysts
ensure
the
preservation
vitrimer
properties
after
numerous
reshaping
processes.
Here,
epoxy
featuring
α-CF3-substituted
ester
functions
is
reported.
First,
tetra-acid
precursor
was
synthesized
via
thia-Michael
addition.
A
ring-opening
polymerization
then
performed
on
two
different
diepoxy
monomers
(DGEBA
BDGE)
obtain
composed
linkages.
Curing
evaluated
by
rheology,
differential
scanning
calorimetry
(DSC),
Fourier
transform
infrared
spectroscopy
(FTIR)
monitoring
kinetics.
gel
content
over
70%
measured
24
h
tetrahydrofuran
(THF).
Finally,
accelerating
effect
α-CF3
group
transesterification
highlighted
stress-relaxation
experiments
analyzed
computationally
molecular
model
system.
Reprocessability
tests
were
carried
out
at
150
°C
for
2
h.
The
mechanical
thermal
reshaped
materials
similar
those
initial
ones.
This
study
demonstrates
fluorinated
groups
powerful
internal
activators
vitrimers.
Macromolecular Rapid Communications,
Journal Year:
2023,
Volume and Issue:
44(7)
Published: Jan. 20, 2023
Abstract
The
rapid
increase
in
the
use
of
plastics
and
related
sustainability
issues,
including
depletion
global
petroleum
reserves,
have
rightly
sparked
interest
biobased
polymer
feedstocks.
Thermosets
cannot
be
remolded,
processed,
or
recycled,
hence
reused
because
their
permanent
molecular
architecture.
Vitrimers
emerged
as
a
novel
family
capable
bridging
difference
between
thermoplastic
thermosets.
enable
unique
recycling
strategies,
however,
it
is
still
important
to
understand
where
raw
material
feedstocks
originate
from.
Transesterification
vitrimers
derived
from
renewable
resources
are
massive
opportunity,
limited
research
has
been
conducted
this
specific
vitrimers.
This
review
article
provides
comprehensive
overview
transesterification
produced
monomers.
focus
on
biomass
structural
suitability
with
dynamic
covalent
chemistry,
well
viability
synthetic
methods.
