ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 30, 2024
Biovitrimer
pads
with
high
flame
retardancy
and
thermal
conductivity
were
developed
using
tannic
acid
(TA),
phosphoric
(PA),
poly(vinyl
alcohol)
(PVA).
For
the
first
time,
it
was
discovered
that
this
type
of
pad
is
formed
through
dynamic
bonding
P–O–C
covalent
bonds.
The
vitrimer
transition
temperature
(Tv),
which
indicates
bonding,
controlled
within
74–91
°C
range
by
adjusting
TA,
PA,
PVA
composition
ratio.
Below
Tv,
exhibited
excellent
elastic
recovery
properties,
a
rate
over
90%
when
subjected
to
100%
strain.
material
demonstrated
tensile
strength
8
MPa
430%
elongation
at
break.
Interestingly,
samples
deformed
100
(above
Tv)
then
rapidly
cooled
showed
shape
memory
effect,
returning
their
original
form
reheated
above
Tv.
Thanks
in
vitrimer,
these
materials
achieved
limiting
oxygen
index
values
exceeding
55%
highest
V-0
rating
UL-94
test,
demonstrating
not
seen
existing
vitrimers.
Combining
biovitrimer
hexagonal
boron
nitride
(h-BN)
produced
composite
film
up
3.8
W/m·K,
proving
its
effectiveness
as
heat
dissipation
pad.
Additionally,
vitrimer's
properties
allowed
for
complete
both
h-BN
recycling.
A
closed-loop
recycling
process
same
performance
could
be
remanufactured
reclaimed
h-BN.
ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
6(15), С. 9306 - 9311
Опубликована: Июль 31, 2024
The
recycling
of
waste
rubber
(WR)
is
beneficial
to
the
sustainable
development
industries.
However,
interactions
among
WR
are
weak,
limiting
WR.
In
this
work,
our
group
designed
bis-diazo
compounds
promote
for
through
aliphatic
C–H
insertion
strategies.
Specifically,
upon
hot
pressing,
produce
bis-carbenes
which
react
with
on
surface
by
insertions,
and
then
we
obtain
recycled
materials.
As
a
result,
stress–strain
curves
show
that
strength
increases
steadily
increase
compound
loading,
has
reached
level
butadiene
styrene
rubbers.
Moreover,
introduced
disulfide
bonds
endow
reprocessability.
Stress–relaxation
experiments
at
different
temperatures
have
unique
vitrimer
viscoelastic
properties.
feasibility
enhance
insertions
opens
opportunities
recycle
reinvent
industrial
Polymer Chemistry,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
A
fully
bio-based
acetal
diepoxy
monomer
synthesized
from
xylitol
exhibits
excellent
mechanical
properties
(tensile
modulus
of
4.06
GPa),
good
thermal
(
T
g
=
240
°C),
and
degradability
after
curing.
ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 30, 2024
Biovitrimer
pads
with
high
flame
retardancy
and
thermal
conductivity
were
developed
using
tannic
acid
(TA),
phosphoric
(PA),
poly(vinyl
alcohol)
(PVA).
For
the
first
time,
it
was
discovered
that
this
type
of
pad
is
formed
through
dynamic
bonding
P–O–C
covalent
bonds.
The
vitrimer
transition
temperature
(Tv),
which
indicates
bonding,
controlled
within
74–91
°C
range
by
adjusting
TA,
PA,
PVA
composition
ratio.
Below
Tv,
exhibited
excellent
elastic
recovery
properties,
a
rate
over
90%
when
subjected
to
100%
strain.
material
demonstrated
tensile
strength
8
MPa
430%
elongation
at
break.
Interestingly,
samples
deformed
100
(above
Tv)
then
rapidly
cooled
showed
shape
memory
effect,
returning
their
original
form
reheated
above
Tv.
Thanks
in
vitrimer,
these
materials
achieved
limiting
oxygen
index
values
exceeding
55%
highest
V-0
rating
UL-94
test,
demonstrating
not
seen
existing
vitrimers.
Combining
biovitrimer
hexagonal
boron
nitride
(h-BN)
produced
composite
film
up
3.8
W/m·K,
proving
its
effectiveness
as
heat
dissipation
pad.
Additionally,
vitrimer's
properties
allowed
for
complete
both
h-BN
recycling.
A
closed-loop
recycling
process
same
performance
could
be
remanufactured
reclaimed
h-BN.
