Macromolecules,
Год журнала:
2024,
Номер
57(21), С. 10311 - 10323
Опубликована: Окт. 19, 2024
This
work
presents
the
synthesis
and
characterization
of
a
highly
transparent
colorless
covalent
adaptable
network
(CAN)
exhibiting
short
relaxation
times
(30
s
at
150
°C)
limited
creep
100
°C.
Based
on
N,S-acetal
functions,
strongly
stabilized
by
trifluoromethyl
group,
this
network,
however,
retains
ability
to
undergo
fast
thiol
exchanges.
The
present
article
describes
detailed
monitoring
cross-linking
via
ATR-FTIR
19F
HRMAS
NMR
(high-resolution
magic
angle
spinning
NMR),
complete
structural
material
13C
NMR,
comprehensive
study
rheological
properties
novel
network.
CAN
shows
hydrolytic
stability
higher
activation
energies
(>90
kJ
mol–1)
than
its
nonfluorinated
counterparts.
Its
reprocessing
occurs
under
relatively
mild
conditions
without
need
for
catalyst,
depolymerization
can
be
achieved
either
with
an
amine
(benzylamine),
acidic
(1
M
HCl)
room
temperature,
or
(1-dodecanethiol)
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(38), С. 13836 - 13867
Опубликована: Сен. 2, 2023
Covalent
adaptable
networks
(CANs)
play
an
important
role
in
polymer
chemistry,
as
they
provide
innovative
link
between
thermoplastics
and
thermosets.
The
breakthrough
idea
behind
CANs
is
to
at
least
partially
replace
irreversible
crosslinks
classic
thermoset
polymers
with
dynamic
covalent
bonds
that
allow
for
reversible
character
recyclability.
Besides,
also
offer
other
popular
features
such
self-healing,
weldability,
configurability,
shape
memory.
Most
are
still
petroleum-based,
yet
shifting
toward
more
sustainable
approaches
of
the
utmost
interest.
Considering
this
high
abundance
lignocellulosic
biomass,
perspective
focuses
on
all
research
found
lignin-based
CANs,
including
both
those
starting
from
fractionated
lignin
monomers.
This
clearly
a
new
branch
within
bio-based
holds
great
potential
various
industries.
Additionally,
some
examples
derived
same
building
blocks
given
showcase
chemical
transformations
can
be
used
design
future.
Although
CAN
has
been
extended
many
different
types
bonds,
imines
disulfides
largely
prevail
current
literature.
Lastly,
SWOT
(strengths,
weaknesses,
opportunities,
threats)
analysis
presented,
considering
performance,
competition,
drawbacks
lignin-derived
CANs.
Advanced Functional Materials,
Год журнала:
2023,
Номер
34(11)
Опубликована: Дек. 3, 2023
Abstract
The
cracks
in
flexible
triboelectric
nanogenerators
(TENG)
cannot
naturally
repair
themselves
during
low‐temperature
operation,
which
significantly
restricts
their
practical
applications.
Yet,
the
development
of
elastomers
capable
self‐repair
at
low
temperatures
has
remained
a
formidable
challenge.
In
this
study,
dual
dynamic
cross‐linking
network
using
multiple
hydrogen
bonds
and
β
‐hydroxy
esters
is
constructed
to
fabricate
fully
bio‐based
elastomer
known
as
PLMBE.
This
can
be
stretched
up
an
impressive
1200%
its
original
length
possesses
remarkable
autonomous
self‐healing
capability
even
under
harsh
conditions,
including
(−10
°C,
12
h,
with
75%
efficiency
rate)
exposure
supercooled,
high‐concentration
saline
(10%
NaCl
solution
−10
64%
rate).
These
properties
are
attributed
elastomer's
glass
transition
temperature
(Tg)
−30
°C
abundance
hydrogen‐bonded
supramolecular
interactions.
Importantly,
highly
suitable
layer
for
creating
TENG
(Bio‐TENG)
.
results
demonstrate
that
Bio‐TENG
achieve
output
power
density
2.4
W
m
−2
,
voltage
recovers
95%
after
°C.
Consequently,
these
have
promising
applications
various
fields,
energy
storage
devices.
Reactive and Functional Polymers,
Год журнала:
2024,
Номер
195, С. 105825 - 105825
Опубликована: Янв. 4, 2024
Two
new
vitrimeric
materials
have
been
studied
for
potential
additive
manufacturing
applications
such
as
3D-printing.
A
monomer
containing
disulfide
bonds
and
β-hydroxyesters
was
easily
synthesized
from
two
low-cost
commercially
available
reagents.
Another
disulfide-containing
comparison
purposes.
Materials
were
prepared
through
a
UV-light
radical
polymerization
of
methacrylates.
The
addition
reactive
diluents
poly(ethylene
glycol)
methyl
ether
methacrylate
(PEGMA)
ethylene
glycol
phenyl
(EGPMA)
necessary
to
achieve
suitable
viscosity
the
curing
well
their
printability.
process
controlled
by
FTIR.
Thermomechanical
properties
investigated
means
DMTA
analysis
revealing
near-ambient
Tg
values.
Stress
relaxation
tests
revealed
that
both
capable
relax
63%
initial
stress
in
less
than
10
min
at
110
°C.
recyclability
achieved,
mechanical
thermomechanical
recycled
samples
compared
virgin
ones
great
recovery
properties.
Finally,
Digital
Light
Processing
(DLP)
technique
used
print
complex
structures
with
high
resolution
highlighting
these
3D
printing.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(5), С. 6523 - 6532
Опубликована: Янв. 26, 2024
Thermosetting
foams
have
limited
capabilities
for
recycling,
reprocessing,
or
reshaping.
Moreover,
most
of
the
foaming
agents
currently
employed
in
these
are
derived
from
organic
compounds
sourced
petrochemicals,
thereby
posing
a
significant
environmental
threat
due
to
heightened
pollution.
To
solve
problems,
fully
biobased
degradable
vitrimer
foam
(EPC-X)
was
fabricated
using
an
environmentally
friendly
all-in-one
strategy
by
cross-linking
epoxidized
malepimaric
anhydride
(EMPA),
1,5-diaminopentane
(PDA),
and
carbamate
(PDAC)
as
latent
curing-blowing
agent.
our
delight,
exhibit
excellent
mechanical
properties
(2.86
±
0.11
MPa
compressive
strength)
owing
their
unique
rigid
rosin
backbone
networks.
The
presence
dynamic
β-hydroxy
ester
bonds
self-catalytic
behavior
tertiary
amine
groups
facilitate
network
rearrangement
without
requiring
additional
catalysts,
resulting
development
EPC-X
with
rapid
self-healing
shape
memory
properties.
could
support
weight
500
g
(approximately
562
times
its
own
mass).
high-performance
can
also
be
easily
degraded
ethanolamine
(EA)
NaOH
solution
under
mild
conditions.
Such
design
offers
alternative
approach
developing
superior
thermal
stimuli-responsive
thermosetting
foams.
Green Chemistry,
Год журнала:
2024,
Номер
26(12), С. 7113 - 7122
Опубликована: Янв. 1, 2024
The
unique
hyperbranched
structure
formed
from
tannic
acid
provides
both
robust
mechanical
properties
and
catalyst-free
recyclability
to
fully
biobased
transesterification
vitrimers.
International Polymer Processing,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 20, 2025
Abstract
Concerns
about
the
effect
on
environment
and
non-renewable
nature
of
plastics
have
sparked
a
substantial
field
study
towards
creation
recyclable
polymers.
Vitrimers
are
potential
class
reusable
polymers
that
recently
attracted
lot
interest.
Like
conventional
thermosets
in
strength,
durability,
chemical
resistance,
these
materials
offer
added
benefit
being
at
end
their
useful
life.
Their
structure,
which
includes
dynamic
covalent
crosslinks
to
provide
stability
while
enabling
reprocessing,
is
credited
with
this
special
characteristic.
We
lay
out
an
overview
recent
developments
applications
epoxy
based
vitrimeric
by
using
different
types
adaptable
networks
(CANs)
–
single,
dual
triple
paper
attention
design
tactics
make
it
easier
create
circular
future.
Covalent
Adaptable
Networks
(CAN),
novel
polymer
family
can
bridge
gap
between
thermoplastics,
emerged
years
uses
chemistry
crosslinked
networks.
The
was
enhanced
2011
Leibler
colleagues
when
they
introduced
notion
vitrimers,
retain
integrity
network
even
after
heating
allow
connections
be
reallocated
within
them
associative
exchange
reactions.
This
review
also
demonstrates
how
vitrimer
community
paying
need
for
sustainable
material
development
demonstrating
use
biobased
building
blocks
synthesis
high-performing
vitrimers.
Having
outlined
primary
characteristics
commercialization
vitrimers
emphasized
portray
benefits
self-healing,
malleability,
orthogonal
processability,
various
shape
memories
along
solutions
synthetic
materials.
