European Polymer Journal,
Год журнала:
2023,
Номер
194, С. 112185 - 112185
Опубликована: Май 30, 2023
This
study
reports
the
synthesis
and
characterization
of
bio-based
disulfide
vitrimers
obtained
from
diepoxy
eugenol
cystamine
through
an
epoxy-amine
polycondensation
process.
TREN
was
added
to
formulation
in
varying
proportions
increase
crosslinking
density.
Although
reduced
number
groups
vitrimers,
it
resulted
a
maximum
relaxation
rate
at
proportion
25%.
The
were
characterized
using
FTIR,
TGA,
thermomechanical
analysis,
their
Tg
values,
determined
by
DSC,
ranged
75
103
°C
with
increasing
proportion.
rapidly
relax
time
(τ)
8.5
min
170
°C.
addition
decreased
times
2.8
1.03
catalyzing
metathesis
achieving
balance
between
bonds
content
nucleophilic
tertiary
amines.
Creep
tests
performed
wide
range
temperatures
investigate
viscosity
material
below
above
Tgs.
topology
freezing
calculated
creep
tests,
Tv
values
all
cases
confirmed
catalytic
effect
amines
on
exchange
reaction.
Chemical Society Reviews,
Год журнала:
2022,
Номер
52(1), С. 277 - 317
Опубликована: Дек. 15, 2022
The
review
presents
the
synthesis,
properties
and
applications
of
sustainable
cycloaliphatic
polyurethanes
from
various
renewable
building
blocks
such
as
biobased
terpenes,
carbohydrates,
fatty
acids
cholesterol
or
plastic
wastes
derivatives.
Macromolecular Rapid Communications,
Год журнала:
2023,
Номер
44(7)
Опубликована: Янв. 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.
Advanced Materials,
Год журнала:
2023,
Номер
35(39)
Опубликована: Март 12, 2023
Abstract
Polyimides
(PIs)
are
widely
used
in
circuit
components,
electrical
insulators,
and
power
systems
modern
electronic
devices
large
appliances.
Electrical/mechanical
damage
of
materials
important
factors
that
threaten
reliability
service
lifetime.
Dynamic
(self‐healable,
recyclable
degradable)
PIs,
a
promising
class
successfully
improve
electrical/mechanical
properties
after
damage,
anticipated
to
solve
this
issue.
The
viewpoints
perspectives
on
the
status
future
trends
dynamic
PI
based
few
existing
documents
shared.
main
forms
dielectric
application
process
first
introduced,
initial
strategies
schemes
these
problems
proposed.
Fundamentally,
bottleneck
issues
faced
by
development
PIs
indicated,
relationship
between
various
universality
method
is
evaluated.
potential
mechanism
deal
with
highlighted
several
feasible
prospective
address
discussed.
This
study
concluded
presenting
short
outlook
improvements
systems,
challenges,
solutions
insulation.
summary
theory
practice
should
encourage
policy
favoring
energy
conservation
environmental
protection
promoting
sustainability.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(36)
Опубликована: Май 18, 2023
Abstract
Linear
chains
in
thermoplastics
make
them
relatively
weak
performance
but
inherently
weldable
and
recyclable.
By
contrast,
thermosets
with
permanently
crosslinked
networks
possess
outstanding
mechanical
performance,
thermal,
chemical
stability,
are
unweldable
unrecyclable.
In
the
last
decade,
a
kind
of
thermoplastics‐like
termed
as
vitrimer
has
been
developed
extensive
applications,
which
welding
vitrimers
plays
central
fundamental
role.
Herein,
we
present
current
state
art
discuss
from
broad
picture
chemistry,
physics,
mechanics:
i)
chemistry
mechanics
vitrimers;
ii)
applicability
assessment
methods
for
iii)
design
principles
implement
strategies
to
iv)
effects
conditions
on
strength
toughness;
v)
applications
adhesion
chemically
inert
materials.
Finally,
advantages,
challenges,
open
questions
highlighted,
future
opportunities
mechanics,
tough
welding,
artificial
intelligence
aided
programming
technology,
standard,
so
discussed.
The
development
would
fuse
disciplines
transformative
impact
polymer
industry.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2023,
Номер
11(39), С. 14591 - 14600
Опубликована: Сен. 12, 2023
Epoxy
(EP)
vitrimers
are
currently
regarded
as
ideal
substitutes
for
traditional
thermosetting
resins,
this
class
of
materials
combines
the
advantages
thermoplastic
and
thermoset
polymers.
However,
maintaining
high
performance
EP
with
excellent
healing
properties
remains
a
challenge.
In
work,
novel
hardener
combining
disulfide
imine
bonds
through
reaction
Schiff
base
(4-AFD-VAN)
was
designed
then
used
to
prepare
vitrimer
dual-dynamic
covalent
bonds.
Compared
single-disulfide-containing
(EVP-4-AFD),
prepared
(EPV-4-AFD-VAN)
exhibited
lower
activation
energy
faster
stress
relaxation.
Moreover,
EPV-4-AFD-VAN
showed
tensile
strength
up
71.5
MPa
maintained
recovery
ratio
approximately
90.0%
during
three
cycles.
Similar
EP,
retained
its
good
solvent
resistance,
breakdown
strength,
dielectric
properties,
which
can
be
chemically
degraded
in
suitable
solvents,
demonstrating
environmental
sustainability.
Polymers,
Год журнала:
2024,
Номер
16(16), С. 2262 - 2262
Опубликована: Авг. 9, 2024
Biodegradable
biobased
polymers
derived
from
biomass
(such
as
plant,
animal,
marine,
or
forestry
material)
show
promise
in
replacing
conventional
petrochemical
polymers.
Research
and
development
have
been
conducted
for
decades
on
potential
biodegradable
such
polylactic
acid
(PLA),
polyhydroxyalkanoates
(PHAs),
succinate
These
materials
evaluated
practicality,
cost,
production
capabilities
limiting
factors
commercialization;
however,
challenges,
the
environmental
limitations
biodegradation
rates
polymer,
need
to
be
addressed.
This
review
provides
a
history
overview
of
current
synthesis
process
properties
polymers,
along
with
techno-commercial
analysis
discussion
impacts
Specifically,
focuses
commercial
potential,
financial
assessment,
life-cycle
assessment
these
materials,
well
government
initiatives
facilitate
transition
towards
Lastly,
challenges
methods
improving
recycling
reusability
