Macromolecular Chemistry and Physics,
Год журнала:
2022,
Номер
223(13)
Опубликована: Фев. 2, 2022
Abstract
Improving
the
sustainability
of
polymer
networks
is
a
crucial
challenge
in
science
due
to
their
important
role
industry.
Their
traditional
syntheses
conflict
with
several
principles
green
chemistry
as
employed
monomers
are
petroleum‐based,
production
involves
use
toxic
reagents,
and
permanently
cross‐linked
structures
impede
chemical
recycling
reshaping.
The
development
vitrimers
represents
unique
solution
address
issue
network
end‐of‐life
by
enabling
reprocessability
while
maintaining
good
thermomechanical
properties
solvent
resistance.
Although
over
last
decades
biomass
has
proved
be
an
excellent
feedstock
for
polymers,
field
biobased
still
its
infancy.
In
this
review,
comprehensive
overview
synthesized
from
presented.
emphasis
set
on
compatibility
structure
nature
dynamic
covalent
chemistry,
well
synthetic
approaches.
Implementing
renewable
feedstocks
recyclability
paves
way
next
generation
sustainable
materials.
Chemical Communications,
Год журнала:
2021,
Номер
57(92), С. 12254 - 12265
Опубликована: Янв. 1, 2021
The
transition
towards
safer
and
more
sustainable
production
of
polymers
has
led
to
a
growing
body
academic
research
into
non-isocyanate
polyurethanes
(NIPUs)
as
potential
replacements
for
conventional,
isocyanate-based
polyurethane
materials.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2021,
Номер
9(32), С. 10664 - 10677
Опубликована: Июль 30, 2021
The
global
market
for
polyols
was
US$26.2
billion
in
2019
and
is
expected
to
grow
up
US$34.4
by
2024.
Polyols
are
most
commonly
employed
as
the
main
component
synthesis
of
polyurethanes,
which
sixth
important
polymer
family
produced
with
a
production
that
reached
around
22
Mt
2019.
In
interest
improving
sustainability
polyurethane
industry,
more
than
decade
has
undergone
shift
toward
biobased
made
from
renewable
resources.
For
this
reason,
demand
grown
rapidly
offers
new
opportunities
valorize
biomass
into
technical
grade
industry.
This
Perspective
aims
summarize
current
strategies
produce
problems
associated
their
implementation.
Different
natural
resources,
including
lignocellulose,
lipids,
or
carbohydrates
polyester-
polyether-based
polyphenols
will
be
reviewed.
Subsequently,
gaps
currently
preventing
transition
academic
laboratories
industrial
plants
commented
upon,
highlighting
particular
use
nonscalable
chemical
transformations
lack
competitive
raw
material
suppliers.
Finally,
case
study
issues
scale-up
process
novel
discussed
detail.
Advanced Materials,
Год журнала:
2023,
Номер
35(26)
Опубликована: Март 25, 2023
Soft
self-healing
materials
are
compelling
candidates
for
stretchable
devices
because
of
their
excellent
compliance,
extensibility,
and
self-restorability.
However,
most
existing
soft
polymers
suffer
from
crack
propagation
irreversible
fatigue
failure
due
to
easy
breakage
dynamic
amorphous,
low-energy
polymer
networks.
Herein,
inspired
by
distinct
structure-property
relationship
biological
tissues,
a
supramolecular
interfacial
assembly
strategy
preparing
composites
with
unprecedented
resistance
is
proposed
structurally
engineering
preferentially
aligned
lamellar
structures
within
superstretchable
poly(urea-ureathane)
matrix
(which
elongated
24
750×
its
original
length).
Such
design
affords
world-record
fracture
energy
(501.6
kJ
m-2
),
ultrahigh
threshold
(4064.1
J
outstanding
elastic
restorability
(dimensional
recovery
13
times
elongation),
preserving
low
modulus
(1.2
MPa),
high
stretchability
(3200%),
room-temperature
efficiency
(97%).
Thereby,
the
resultant
composite
represents
best
kind
even
surpasses
tissues.
The
2D
transition-metal
carbide/carbonitride
(MXene)
structure
also
leads
relatively
in-plane
thermal
conductivity,
enabling
as
thermoconductive
skins
applied
in
joints
robotics
dissipation.
present
work
illustrates
viable
approach
how
autonomous
self-healing,
tolerance,
can
be
merged
future
material
design.
ACS Nano,
Год журнала:
2023,
Номер
17(2), С. 1393 - 1402
Опубликована: Янв. 9, 2023
Among
the
increasingly
popular
miniature
and
flexible
smart
electronics,
two-dimensional
materials
show
great
potential
in
development
of
electronics
owing
to
their
layered
structures
outstanding
electrical
properties.
MXenes
have
attracted
much
attention
excellent
hydrophilicity
metallic
conductivity.
However,
limited
interlayer
spacing
tendency
for
self-stacking
lead
changes
electron
channels
under
external
pressure,
making
it
difficult
exploit
surface
metal
We
propose
a
strategy
rapid
gas
foaming
construct
tunable
MXene
aerogels.
aerogels
with
rich
network
generate
maximized
facilitating
effective
utilization
properties
MXene;
this
forms
self-healable
pressure
sensor
sensing
such
as
high
sensitivity
(1,799.5
kPa–1),
fast
response
time
(11
ms),
good
cycling
stability
(>25,000
cycles).
This
has
applications
human
body
detection,
human–computer
interaction,
self-healing,
remote
monitoring,
distribution
identification.
The
channel
design
provides
simple,
efficient,
scalable
method
effectively
conduction
2D
materials.
ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
15(15), С. 19414 - 19426
Опубликована: Апрель 5, 2023
Polymers
that
integrate
multiple
functions
into
one
system
broaden
the
application
range
of
materials,
but
it
remains
a
great
challenge
to
obtain
polymer
materials
with
simultaneously
high
strength,
toughness,
and
self-healing
rate.
In
this
work,
we
prepared
waterborne
polyurethane
(WPU)
elastomers
using
Schiff
bases
containing
disulfide
acylhydrazone
bonds
(PD)
as
chain
extenders.
Acylhydrazone
forming
hydrogen
bond
not
only
acts
physical
cross-linking
point,
which
promotes
microphase
separation
increase
thermal
stability,
tensile
toughness
elastomer,
also
serves
"clip"
various
dynamic
together
synergistically
reduce
activation
energy
movement
endow
molecular
faster
fluidity.
Therefore,
WPU-PD
exhibits
excellent
mechanical
properties
at
room
temperature,
such
strength
fracture
25.91
MPa
121.66
kJ
m-2,
respectively,
efficiency
93.7%
in
short
time
under
moderate
heating
conditions.
addition,
photoluminescence
property
enables
us
track
its
process
by
monitoring
change
fluorescence
intensity
cracks,
helps
avoid
accumulation
cracks
improve
reliability
elastomer.
This
has
potential
value
optical
anticounterfeiting,
flexible
electronics
devices,
functional
automobile
protective
films,
so
on.
Angewandte Chemie International Edition,
Год журнала:
2022,
Номер
61(41)
Опубликована: Июль 21, 2022
Abstract
Inspired
by
the
self‐healing
function
of
living
organisms,
materials
have
been
developed
in
recent
decades
to
very
high
standards.
As
a
new
direction,
fibrous
membranes
(SFMs)
exhibit
both
configuration
porous
structure
and
capability
within
one
material.
Different
from
nonporous
materials,
it
is
more
challenging
introduce
properties
membrane
owing
complex
healing
mechanism
microstructure
SFMs.
This
Minireview
focuses
on
mechanisms,
design
principles,
preparation
strategies
The
characteristics
SFM
performance
are
introduced
detail,
insights
perspectives
mechanisms
put
forward.
Furthermore,
remaining
challenges
future
developments
SFMs
presented,
where
ultimate
goal
highly
efficient
superstable
membranes.
Macromolecules,
Год журнала:
2022,
Номер
55(18), С. 7974 - 7991
Опубликована: Сен. 5, 2022
While
transesterification
has
been
largely
explored
by
chemists,
only
a
few
studies
comparatively
dealt
with
its
"sluggish
cousin",
transcarbamoylation.
Originally
suggested
70
years
ago
to
explain
the
stress
decay
observed
at
high
temperature
in
polyurethane
chemical
networks,
transcarbamoylation─also
called
transurethanization
or
urethane
exchange─is
still
underexploited
both
organic
and
polymer
chemistry.
This
is
mainly
related
use
of
toxic
reactants
such
as
isocyanates
tin-based
catalysts
involved
during
preparation
molecular
carbamates
polyurethanes
(PUs)
well
harsh
conditions
required
observe
exchanges
transformations.
Many
have
focused
their
interest
alternatives
isocyanates,
underestimating
potential
transcarbamoylation
produce,
recycle,
reprocess
PUs
(wastes).
Perspective
presents
latest
developments
plausible
future
directions
prepare
sustainable
PU-based
materials
using
focus
on
covalent
dynamic
networks.
Angewandte Chemie International Edition,
Год журнала:
2022,
Номер
61(50)
Опубликована: Сен. 28, 2022
Dynamic
bonds
introduce
unique
properties
such
as
self-healing,
recyclability,
shape
memory,
and
malleability
to
polymers.
Significant
efforts
have
been
made
synthesize
a
variety
of
dynamic
linkers,
creating
diverse
library
materials.
In
addition
the
development
new
chemistries,
fine-tuning
has
emerged
technique
modulate
properties.
This
Review
highlights
approaches
for
controlling
timescales
in
Particularly,
eight
are
considered,
including
urea/urethanes,
boronic
esters,
Thiol-Michael
exchange,
Diels-Alder
adducts,
transesterification,
imine
bonds,
coordination
hydrogen
bonding.
emphasizes
how
structural
modifications
external
factors
used
tools
tune
character
Finally,
this
proposes
strategies
tailoring
polymer
materials
through
both
kinetic
effects
modulating
bond
thermodynamics.
