Giant,
Год журнала:
2022,
Номер
13, С. 100136 - 100136
Опубликована: Дек. 13, 2022
Thermosets
and
their
composites
have
occupied
a
key
place
in
the
polymeric
material
industry
for
both
plastics
rubbers.
Carbon
material/thermoset
composite
is
major
category
thereof.
The
addition
of
carbon
(such
as
fibers,
nanotubes
(CNTs),
graphene)
endows
materials
with
better
mechanical
properties,
enhanced
optical
electrical
etc.
However,
due
to
thermoset
nature,
covalently
crosslinked
network
brings
huge
reprocessing
recycling
difficulties.
development
vitrimers
paves
new
way
produce
recyclable
degradable
thermosets.
A
series
material/vitrimer
also
been
innovated,
aiming
at
sustainable
high-performance
physical
recyclability,
reprocessablity,
other
novel
stimuli-responsive
functions.
This
review
summarized
progress
past
decade.
general
introduction
vitrimer
preparation
strategies
different
kinds
are
given
first.
Because
vitrimeric
service
life
those
could
be
significantly
prolonged
by
reprocessing,
healing,
recycling,
related
which
described
detail.
Then,
improved
properties
functions
enabled
incorporation
fillers
overviewed.
Our
outlook
on
future
directions
present
end.
Composites Part B Engineering,
Год журнала:
2023,
Номер
258, С. 110667 - 110667
Опубликована: Март 15, 2023
Thermosets
are
polymeric
materials
that
contain
permanent
networks
and
thus
difficult
to
recycle.
They
not
reprocessable
once
cured
often
do
degrade
under
mild
conditions.
Over
the
past
decades,
use
of
in
fire
safety
applications
has
increased,
so
is
need
for
them
be
more
sustainable.
From
this
standpoint,
recently
two
major
challenges
designing
next-generation
thermosets
have
attracted
much
attention
scientific
community:
embedded
reprocessability/recyclability.
In
review,
a
detailed
report
on
research
progress
design
fire-safe
thermomechanical
reprocessable/recyclable
presented.
Such
designed
only
enable
reuse
recycling
polymer
material
but
also
recover
valuable
components
(carbon
fibers
or
rare
additives)
encapsulated
matrix.
The
flame
retardant
recyclable
thermoset
categorized
based
chemistry
labile
bonds
(covalent
adaptable
networks):
i.e.
(i)
esters
(carboxylic
phosphate
esters),
(ii)
sulfur-containing
linkages,
(iii)
nitrogen-containing
structures,
(iv)
other
phosphorus-containing
structures.
addition,
bio-based
raw
constructing
these
highlighted.
synthetic
route,
performance,
method,
degradation
mechanism,
various
approaches
being
developed
by
researchers
towards
summarized
detail
review.
Despite
great
advances
in
vitrimer,
it
remains
highly
challenging
to
achieve
a
property
portfolio
of
excellent
mechanical
properties,
desired
durability,
and
high
fire
safety.
Thus,
catalyst-free,
closed-loop
recyclable
transesterification
vitrimer
(TPN
Chemical Engineering Journal,
Год журнала:
2023,
Номер
466, С. 143051 - 143051
Опубликована: Апрель 20, 2023
The
development
of
reusable
fire-safe
polymers
with
a
prolonged
lifetime
heralds
the
switch
for
transition
towards
circular
economy.
In
this
framework,
we
report
novel
phosphonated
thermoset
which
is
composed
networked
phosphonate
esters
containing
both
PC
and
PO
bonds.
Employing
simple
one-pot,
two-step
synthetic
methodology,
oxirane
groups
epoxy
resin
were
partially
reacted
various
amounts
reactive
bis
H-phosphonate
monomer,
cured
cycloaliphatic
hardener
to
obtain
multifunctional
thermosets
up
8%
phosphorus
(P)
content.
Though
2.5%
P
was
adequate
achieve
good
flame
retardancy,
concentration
>
5%
necessary
accomplishing
material
reprocessability
recyclability.
These
exhibited
high
Tg
(94
°C
–
140
°C)
thermal
stability.
Fire
performance
via
cone
calorimetry
showed
effective
reduction
in
peak
heat
release
rate
(pHRR,
75%)
significant
inhibition
total
smoke
production
(TSP,
72.5%),
attributed
gas
condense
phase
actions
moieties.
This
explored
as
transparent
coating
on
wood
where
an
intumescent
retardant
mechanism
observed.
higher
content
(6%)
demonstrated
excellent
damage
reparability
thermomechanical
driven
by
transesterification
induced
network
rearrangement.
used
manufacturing
flax
fiber
reinforced
composite,
demonstrate
its
future
application
polymer
matrix
composite
materials.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(51)
Опубликована: Сен. 28, 2023
Although
a
variety
of
dynamic
covalent
bonds
have
been
successfully
used
in
the
development
diverse
sustainable
thermosetting
polymers
and
their
composites,
solving
trade-off
between
recovery
efficiency
comprehensive
properties
is
still
major
challenge.
Herein,
"one-stone-two-birds"
strategy
lower
rotational
energy
barrier
(Er
)
phosphate-derived
Diels-Alder
(DA)
cycloadditions
was
proposed
for
easily
recyclable
carbon
fiber
(CF)-reinforced
epoxy
resins
(EPs)
composites.
In
such
strategy,
phosphate
spacer
with
Er
accelerated
segmental
mobility
DA
exchange
reaction
network
rearrangement
to
achieve
high-efficiency
repairing,
reprocessing
EPs
matrix
its
composites
rapid
nondestructive
recycling
CF;
meanwhile,
incorporating
phosphorus-based
units
especially
reduced
fire
hazards.
The
resulting
materials
simultaneously
showed
excellent
thermal/mechanical
properties,
superb
safety
facile
recyclability,
realizing
concept
high-performance
This
great
significance
understanding
enriching
molecular
connotation
chemistry,
making
it
potentially
applicable
design
wide
range
adaptable
toward
practical
cutting-edge-tech
applications.
Polymer Testing,
Год журнала:
2024,
Номер
131, С. 108352 - 108352
Опубликована: Фев. 1, 2024
A
novel
PNFR
(BOPOA)
was
synthesized
and
employed
to
flame
retardant
epoxy
resin
(EP).
4,4′-Diaminodiphenylmethane
(DDM)
BOPOA
co-cured
EP
exhibited
satisfactory
mechanical
properties,
with
the
maximum
tensile
flexural
strength
being
61
%
31
higher
than
those
without
(BOPOA-0).
Limiting
oxygen
index
of
DDM
cured
1.5wt%
phosphorus
introduced
(BOPOA-1.5)
increased
by
38
BOPOA-0,
it
passed
UL94
V0
rating.
Time
flameout
shortened
45
%,
peak
average
heat
release
rate
total
decreased
25
24
respectively.
promoted
graphitization
carbon
residues
improved
their
stability.
Evolved
gas
analysis
proved
that
not
only
changed
pyrolysis
pathways
reduced
combustible
substantially,
but
also
released
phosphorus-containing
free
radicals
interrupted
chain
reactions
combustion.
This
work
presents
a
facile
pathway
for
fabricating
high
performance
excellent
retardancy
strength.
