The
increasing
amount
of
nondegradable
petroleum-based
plastic
waste
releases
chemical
hazards,
posing
a
significant
threat
to
the
environment
and
human
health.
Chitosan,
derived
from
marine
wastes,
is
an
attractive
feedstock
for
preparation
replacement
due
its
renewable
degradable
nature.
However,
in
most
cases,
complex
modifications
chitosan
or
hybridization
with
chemicals
fossil
resources
are
required.
Herein,
we
present
high-performance
chitosan-based
polyimine
vitrimer
(CS-PI)
through
mild
catalyst-free
Schiff
base
reaction
between
vanillin.
CS-PI
were
formed
by
integrating
dynamic
imine
bonds
into
polymer
networks,
resulting
superior
thermo-processability
mechanical
performances.
tensile
strength
Young’s
modulus
films
reached
38.72
MPa
3.22
GPa,
respectively,
which
was
significantly
higher
than
that
both
commercial
plastics
bioplastics.
Additionally,
exhibited
good
light
transmittance,
self-healing
ability,
reprocess
capacity,
water
resistance,
durability
various
organic
solvents.
Moreover,
could
be
completely
degraded
under
acidic
natural
conditions,
enabling
sustainable
circulation.
Therefore,
this
work
offers
new
design
strategy
developing
all-natural
environmentally
friendly
polymers
as
replacements
plastics,
thus
reducing
accumulation
waste.
ACS Nano,
Journal Year:
2023,
Volume and Issue:
17(21), P. 21420 - 21431
Published: Nov. 3, 2023
Its
excellent
renewability
and
biodegradability
make
cellulose
an
attractive
resource
to
prepare
fossil-based
plastic
alternatives.
However,
itself
exhibits
strong
intermolecular
hydrogen
bond
(H-bond)
interactions,
significantly
restricting
the
mobility
of
chains,
thus
leading
poor
thermo-processing
performance.
Here,
we
reconstructed
interactions
chains
via
replacing
original
H-bonds
with
dynamic
covalent
bonds.
By
this,
can
be
easily
thermo-processed
into
a
cellulosic
under
mild
conditions
(70
°C).
Through
adjusting
chemical
structure
networks,
shows
tunable
mechanical
strength
(3.0–33.5
MPa)
toughness
(43–321
kJ
m–2).
The
also
resistance
water,
organic
solvent,
acid
solution,
alkali
high
temperature
(>400
Moreover,
it
owns
good
biological
degradability
recyclability.
This
work
provides
effective
method
develop
high-performance
plastics
for
substitution.
ACS Sensors,
Journal Year:
2024,
Volume and Issue:
9(6), P. 3085 - 3095
Published: June 6, 2024
Wearable
gas
sensors
have
drawn
great
attention
for
potential
applications
in
health
monitoring,
minienvironment
detection,
and
advanced
soft
electronic
noses.
However,
it
still
remains
a
challenge
to
simultaneously
achieve
excellent
flexibility,
high
sensitivity,
robustness,
permeability,
because
of
the
inherent
limitation
widely
used
traditional
organic
flexible
substrates.
Herein,
an
electrospinning
polyacrylonitrile
(PAN)
nanofiber
network
was
designed
as
substrate,
on
which
ultraflexible
wearable
sensor
prepared
with
situ
assembled
polyaniline
(PANI)
multiwalled
carbon
nanotubes
(MWCNTs)
sensitive
layer.
The
unique
strong
binding
force
between
substrate
sensing
materials
endow
permeability.
can
maintain
stable
NH3
performance
while
sustaining
extreme
bending
stretching
(50%
strain).
Young's
modulus
PAN/MWCNTs/PANI
is
low
18.9
MPa,
several
orders
magnitude
smaller
than
those
reported
sensors.
water
vapor
transmission
rate
0.38
g/(cm2
24
h),
enables
wearing
comfort
sensor.
Most
importantly,
due
effective
exposure
sites
well
heterostructure
effect
MWCNTs
PANI,
shows
sensitivity
at
room
temperature,
theoretical
limit
detection
300
ppb.
This
work
provides
new
avenue
realization
reliable
high-performance
ACS Sustainable Chemistry & Engineering,
Journal Year:
2024,
Volume and Issue:
12(7), P. 2668 - 2677
Published: Feb. 5, 2024
Replacing
traditional
petroleum-based
plastics
with
degradable
biobased
has
become
one
of
the
significant
strategies
to
address
energy
shortages
and
environmental
issues.
Nevertheless,
it
still
remains
a
scientific
challenge
develop
ultrastrong
mechanical
strength
superior
recyclability.
Here,
catalytic
conversion
Sapium
sebiferum
oil
(SSO)
9,10-dihydroxy-octadecanoic
acid
(C18-OH)
monomer
is
first
designed.
Simultaneously,
novel
plastic,
namely,
PEA,
fabricated
by
dual
network
through
one-pot
melt-polymerization,
which
exhibits
performance
higher
than
most
commercial
other
reported
PEAs.
Benefiting
from
synergy
dynamic
nature
H-bonds
hydroxy-ester
bonds
as
well
flexibility
long
aliphatic
chain,
PEAs
exhibit
exceptional
repairability
reprocessability.
More
importantly,
can
be
efficiently
degraded
into
original
reagents
cross-linked
materials
reconstructed
recovered
monomers
without
losing
pristine
performance.
Additionally,
abundant
polar
groups
provide
excellent
adhesion
properties
for
high
shear
10.29
±
0.21
MPa.
This
work
unveils
an
elegant
efficient
synthetic
route
fabricate
impressively
robust
chemically
recyclable
promising
alternatives
conventional
plastics.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
34(7)
Published: Nov. 5, 2023
Abstract
Malleable
thermosets
as
dynamic
covalent
cross‐linked
polymers,
simultaneously
possessing
the
advantages
of
and
thermoplastics,
have
attracted
considerable
attention.
Although
several
reprocessing
concepts
been
demonstrated,
fabrication
fast‐curing
bio‐based
strong
tough
malleable
for
advanced
applications
in
electronics
remains
a
great
challenge.
Herein,
novel
construction
strategy
combining
hindered
urea
bonds
(HUB)
radical
polymerization
is
developed
to
prepare
fast‐photocurable
mechanically
robust
cellulose‐based
bio‐thermosets
(CMTs).
In
this
strategy,
functional
cellulose
macromonomer
has
acrylate
groups
HUB
first
synthesized
employed
macro‐crosslinker
react
with
plant
oil‐based
monomer
construct
“soft
(plant
polymer)”
“hard
(rigid
cellulose)”
phase
architecture
through
fast
photocuring.
The
CMTs
exhibit
excellent
flexibility
high
toughness
(2.89
MJ
m
−3
),
introduction
endows
malleability
reprocessability
by
heating
compression
molding
or
solvent
regeneration,
recovery
efficiency
reached
94.7%.
More
impressively,
can
be
used
substrates
fabricate
CMTs/silver
composite
anti‐icing
de‐icing
devices,
CMTs‐based
capacitive
sensors
monitoring
environmental
humidity
human
health.
This
work
paves
new
develop
new‐generation
robust,
multifunctional
electronic
devices.
