A
high-temperature
polybenzoxazine
vitrimer
has
been
synthesised
by
a
solventless
one-pot
method
involving
the
Mannich
condensation
of
phenolic
disulphide,
paraformaldehyde
and
aniline.
The
glass
transition
temperature
155°C
exhibits
thermosetting
behaviour
below
temperature.
Dynamic
bond
exchange
enabled
disulphide
metathesis
associated
with
topological
freezing
78°C
results
in
healing
over
system
is
reprocessable
at
190°C,
glassy
modulus
3.6
GPa,
limiting
oxygen
index
(LOI)
40.5%.
combination
character,
ease
synthesis,
good
processability,
fire
retardancy
reprocessability
this
make
it
an
attractive
candidate
material
solution
as
matrix
for
recyclable
self-repairable
aerospace
continuous
fibre
composites.
Both
strong
and
easily
dismantlable
adhesive
systems
are
required
to
realize
a
sustainable
society
by
recovering
reusing
substrates.
Introducing
topological
cross-links
with
cyclodextrins
(CDs)
into
adhesives
can
improve
their
strength.
In
this
study,
we
prepared
movable
cross-linked
poly(ethyl
acrylate)
(PEA-TAcγCD)
polymerizable
CDs
acid-degradable
bonds
(TAcγCDAAmMe)
for
both
adhesion.
The
O-amidomethyl
bond,
which
links
CD
functional
group,
be
degraded
mixing
Brønsted
acid.
By
combining
PEA-TAcγCD
photoacid
generators,
successfully
controlled
the
mechanical
properties
cleaving
upon
light
stimulation.
degradation
mechanism
of
TAcγCDAAmMe
generators
was
confirmed
mass
spectrometry.
addition,
cleavage
cross-linking
points
via
stimulation
demonstrated
alteration
chain
relaxation
system,
were
evaluated
utilizing
tensile
tests
dynamic
analysis,
respectively.
Therefore,
light-responsive
degradable
elastomer
appeared
applicable
as
an
dismantled
on-demand
adhesion
system.
Using
stimulation,
strengths
same
or
dissimilar
substrates
reduced.
easy
dismantling
system
applying
acid
degradability
enabled
excellent
derived
from
Facilitating
disassembly,
collection,
reuse
resources
will
contribute
realization
society.
Macromolecular Chemistry and Physics,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 17, 2025
Abstract
Dynamic
covalent
polymer
networks
(DCPNs)
are
a
class
of
cross‐linked
polymeric
materials
with
good
self‐healing
properties,
processability,
and
recyclability.
These
generally
possess
dynamic
bonds
which
can
undergo
reversible
cleavage
reformation
under
certain
conditions.
The
cross‐linking
nature
the
endows
them
needed
mechanical
strength
as
well
processibility,
effectively
bridging
gap
between
traditional
thermosets
thermoplastics.
However,
in
many
cases,
relying
on
alone
cannot
always
achieve
satisfactory
material
so
modification
DCPNs
has
been
one
hot
spots
this
area.
This
review
summarizes
recent
research
progress
DCPNs,
including
introduction
multiple
filler
blending,
analyzes
how
modifications
improve
specific
properties.
provides
comprehensive
overview
diverse
methods
to
manipulate
structures
properties
may
expand
their
potential
applications.
Soft Matter,
Journal Year:
2023,
Volume and Issue:
19(46), P. 9074 - 9081
Published: Jan. 1, 2023
Organic-inorganic
materials
have
been
widely
utilized
in
various
fields
as
multifunctional
materials.
Poly(dimethyl
siloxane)
(PDMS),
a
typical
inorganic
polymer,
has
industrially
appealing
functions,
such
transparency,
biocompatibility,
and
gas
permeability;
however,
it
poor
mechanical
properties.
We
incorporated
organic-inorganic
hybrid
elastomers
(PDMS-γCD-AAl⊃P(EA-HEMA)
(x))
with
movable
crosslinks,
we
hydrogen
bonds
reversible
crosslinks.
The
organic
polymer
poly
ethyl
acrylate-r-hydroxy
methacrylate
(P(EA-HEMA))
penetrated
the
cavity
of
triacetylated
γ-cyclodextrin
(γCD),
which
was
introduced
into
side
chains
PDMS,
compounded
PDMS
at
nanoscale.
Structural
studies
involving
visual
X-ray
scattering
measurements
revealed
that
crosslinks
improved
compatibility
levels
acrylate
copolymers.
However,
macroscopic
phase
separation
occurred
when
number
increased.
Furthermore,
on
mobility
copolymers
indicated
relaxation
behaviour
PDMS-γCD-AAl⊃P(EA-HEMA)
(x)
changed
changing
numbers
Introducing
Young's
modulus
toughness
values.
between
polymers
contributed
to
high
elongation
design
cooperatively
achieve
immiscible
control
Gels,
Journal Year:
2023,
Volume and Issue:
9(10), P. 819 - 819
Published: Oct. 14, 2023
Polybenzoxazine
(PBZ)
exhibits
excellent
heat
resistance,
and
PBZ
derivatives
have
been
designed
synthesized
to
achieve
high
performance.
However,
the
application
range
of
is
limited
by
strong
interactions
between
molecular
chains
its
low
solubility
in
organic
solvents,
thereby
limiting
processability.
This
study
focused
on
benzoxazine
structure
as
backbone
new
hydrogel
materials
that
can
be
applied
electrolyte
prepared
functional
gel
materials.
Here,
we
hydrogels
water-solubilizing
derivatives,
which
typically
exhibit
solvents.
Although
studies
hydrophilization
complexation
with
hydrophilic
polymers
conducted,
no
performed
hydrogelation
PBZ.
First,
phenol
solvent-insoluble
thin
film
obtained
after
thermal
ring-opening
polymerization
monomer
was
transformed
into
sodium
phenoxide
immersion
a
NaOH
aqueous
solution
water-solubilize
it
obtain
film.
exhibited
mechanical
strength,
free-standing
improved
strength
through
double
network
gelation
method
an
acrylamide
system.
The
physical
properties
polymer
composite
were
evaluated.
ionic
conductivity
films
order
10−4
S
cm−1,
indicating
potential
material.
improving
will
undertaken
future
studies.
A
high-temperature
polybenzoxazine
vitrimer
has
been
synthesised
by
a
solventless
one-pot
method
involving
the
Mannich
condensation
of
phenolic
disulphide,
paraformaldehyde
and
aniline.
The
glass
transition
temperature
155°C
exhibits
thermosetting
behaviour
below
temperature.
Dynamic
bond
exchange
enabled
disulphide
metathesis
associated
with
topological
freezing
78°C
results
in
healing
over
system
is
reprocessable
at
190°C,
glassy
modulus
3.6
GPa,
limiting
oxygen
index
(LOI)
40.5%.
combination
character,
ease
synthesis,
good
processability,
fire
retardancy
reprocessability
this
make
it
an
attractive
candidate
material
solution
as
matrix
for
recyclable
self-repairable
aerospace
continuous
fibre
composites.
