Structure–Property Relationships of Elastomeric Vinylogous Urethane Thermosets and Their Application as Closed-Loop Recyclable Strain Sensors
Macromolecules,
Journal Year:
2025,
Volume and Issue:
58(4), P. 1923 - 1934
Published: Feb. 5, 2025
Developing
closed-loop
recyclable
thermosets
and
understanding
their
structure–property
relationships
are
essential
steps
in
advancing
a
circular
materials
economy.
Here,
we
present
vinylogous
urethane
(VU)
thermoset
with
recyclability,
synthesized
through
the
reaction
of
polytetrahydrofuran
bisacetoacetate
(aPTHF)
tris(2-aminoethyl)amine
(TREN).
These
VU
polymers
exhibit
high
elasticity,
only
3–9%
residual
strain
observed
after
cyclic
tensile
testing
at
maximum
100%,
depending
on
molecular
weight
aPTHF
network
cross-link
density.
The
two
structural
parameters
also
allow
modulation
mechanical
stress-relaxation
properties
elastomers.
To
investigate
hydrolysis
linkages
within
hydrophobic
matrix,
employed
heterogeneous
system
using
biphasic
mixture
HCl
CDCl3.
Our
findings
show
that
VUs
remain
stable
pure
water
but
can
be
dissociated
under
acidic
conditions,
dissociation
rate
accelerated
higher
temperatures
and/or
presence
concentrations.
detailed
investigations
indicate
potential
elastomers
as
sustainable
substrates
for
wearable
sensors.
We
therefore
conduct
case
study
synthesizing
sensor
incorporation
multiwalled
carbon
nanotubes
(MCNs)
into
elastomer
matrix.
robustly
detect
various
movements.
Moreover,
treatment
both
neat
polymer
composite
diethyl
ether
solvent
allows
excellent
recovery
(>90%)
TREN
(86%),
without
discernible
damage
to
MCNs
reclaimed
from
latter.
Language: Английский
A Transparent, Abrasion‐Resistant Anti‐Fog Coating on Glass Substrates
Journal of Applied Polymer Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 7, 2025
ABSTRACT
The
formation
of
fog
on
the
surface
transparent
glass
severely
reduces
its
transmittance,
which
limits
application
in
medical
devices,
optical
instruments,
and
other
industries
that
require
high
transmittance.
A
new
transparent,
water‐resistant,
abrasion‐resistant
PVA
anti‐fog
coating
based
polyvinyl
alcohol
(PVA),
5‐sulfosalicylic
acid
(SAD),
ammonium
persulfate
(APS)
was
developed
this
study.
hydroxyl,
carboxyl,
sulfonic
groups
SAD
molecule
can
form
dense
hydrogen
bonds
with
hydroxyl
side
chain,
increases
water
resistance
coating.
APS,
as
a
free
radical
initiator,
produce
sulfate
radicals
during
thermal
curing
eventually
cross‐linked
structure
main
carbon
thereby
further
improving
resistance,
friction
stability
experimental
results
show
modified
by
not
only
has
excellent
light
transmittance
performance
but
also
good
abrasion
stability.
In
addition,
preparation
method
hydrophilic
is
simple
convenient,
nontoxic
environmentally
friendly
used
solvent,
expected
to
be
large‐scale
industrial
production.
Language: Английский
Direct Monomer Recovery from Ring-Closing Depolymerization of Thermosets
ACS Macro Letters,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1704 - 1710
Published: Dec. 7, 2024
Recovering
monomers
from
the
depolymerization
of
thermosets
presents
a
significant
challenge,
which
becomes
even
more
daunting
if
one
sets
goal
doing
it
directly,
i.e.,
without
complex
chemical
separation
steps.
To
this
end,
we
have
synthesized
new
type
polycarbonate
thermoset
by
first
copolymerizing
alkyl
cyclic
carbonates
(ACCs)
with
small
amounts
allyloxy
(AoCCs),
followed
cross-linking
resulting
excess
tetrathiol
compounds
under
UV
irradiation.
These
cross-linked
polycarbonates
demonstrate
enhanced
thermal
and
mechanical
properties
compared
to
their
linear
analogues,
while
maintaining
polymers'
capacity
for
ring-closing
depolymerization.
The
process
enables
direct
recovery
ACC
its
dimer,
bypassing
steps
that
are
commonly
employed
in
recycling
conventional
chemically
recyclable
thermosets.
yields
range
74.7%
91.7%
depending
on
ratios
AoCC
Furthermore,
recovered
can
be
repolymerized
AoCCs
leading
same
quality
initially
one.
Language: Английский