Macromolecular Chemistry and Physics,
Год журнала:
2024,
Номер
225(19)
Опубликована: Июль 9, 2024
Abstract
Resveratrol
and
2‐thiophenemethylamine
have
been
employed
in
the
synthesis
of
a
novel
tri‐functional
benzoxazine
(RES‐th)
to
develop
bio‐benzoxazine
monomer.
The
chemical
structure
synthesized
monomer
is
confirmed
by
various
characterization
technics.
polymerization
behavior
monitored
situ
Fourier
transform
infrared
spectroscopy
(FTIR)
differential
scanning
calorimetry
(DSC).
FTIR
results
reveal
distinct
reaction
mechanisms
for
three
oxazine
rings
presented
RES‐th,
with
both
ether
phenolic
Mannich
bridge
structures
observed
products.
activation
energy
values
RES‐th
are
calculated
be
119.05,
120.97,
119.44
kJ
mol
−1
Kissinger,
Ozawa,
Starink
methods,
respectively,
which
all
based
on
heat
flow
curves
at
heating
temperatures.
thermal
stability
flame
retardancy
resulting
polybenzoxazine
(poly(RES‐th))
investigated
thermogravimetric
analysis
(TGA)
microscale
combustion
calorimeter
(MCC).
T
d5
d10
found
356
°C
399
°C,
char
yield
66.3%
800
°C.
prepared
also
demonstrates
nonflammability
characteristics
release
capacity
(HRC)
total
rate
(THR)
18.65
J
(g
K)
2.69
g
,
respectively.
These
findings
suggest
that
thermoset,
poly(RES‐th),
promising
candidate
fire‐resistant
applications.
Journal of Applied Polymer Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 3, 2025
ABSTRACT
Melamine‐based
benzoxazine
resins
overcome
the
disadvantages
of
conventional
polybenzoxazine,
such
as
high
brittleness
and
difficult
processing.
However,
reactivity
is
too
to
be
easily
processed.
In
this
work,
phenolphthalein‐type
melamine‐based
(PTma‐BG)
was
synthesized
from
paraformaldehyde,
phenolphthalein,
melamine,
benzeneguanoamine.
The
chemical
structure
PTma‐BGs
characterized
by
fourier
transform
infrared
spectroscopy
(FTIR)
proton
nuclear
magnetic
resonance
(
1
H
NMR),
curing
behavior
properties
resulting
polymers
were
verified.
results
demonstrate
that
incorporation
benzeneguanoamine
facilitates
formation
oxazine
ring
while
simultaneously
reducing
precursor,
prolonging
gelation
time,
expanding
processing
window.
Poly(PTma‐40BG)
has
good
thermal
stability;
it
been
observed
T
d5
Poly(PTma‐40ma)
reaches
328°C,
which
higher
than
Poly(PTma).
Furthermore,
Poly(PTma‐BG)s
exceptional
heat
resistance,
with
a
glass
transition
temperature
exceeding
285°C.
introduction
in
reduction
number
polar
groups,
turn
leads
decrease
both
water
absorption
dielectric
constant.
Herein,
we
synthesized
a
difunctionalized
bio-based
vanillin
azine
monomer
(4,4′-((1E,1′E)-hydrazine-1,2-diylidenebis(methaneylylidene))bis(2-methoxyphenol),
VBAZ-2OH)
via
Schiff
base
reaction
between
and
hydrazine
monohydride.
Subsequently,
successfully
prepared
2,2′-(((1E,1′E)-hydrazine-1,2-diylidenebis(methaneylylidene))bis(8-methoxy-2H-benzo[e][1,3]oxazine-6,3(4H)-diyl))bis(ethan-1-ol),
VBAZ-BZ-2OH),
which
contains
oxazine
units,
through
Mannich
condensation
of
VBAZ-2OH
with
ethanolamine
paraformaldehyde
in
1,4-dioxane
as
the
solvent.
The
chemical
structures
these
two
monomers
(VBAZ-2OH
VBAZ-BZ-2OH)
were
characterized
by
using
NMR
FTIR
analyses.
Our
study
aimed
to
investigate
transesterification
reactions
blending
different
VBAZ-BZ-2OH/phenolic
resin
(BP)
compositions
PEO112-b-PCL99
(EC)
diblock
copolymer
form
various
BP/EC
blends.
These
blends
exhibit
competitive
hydrogen-bonding
interaction
phenomena,
analyzed
one-dimensional
two-dimensional
Interestingly,
after
thermal
treatment
at
150
°C,
ordered
self-assembled
lamellae
or
hexagonal
packed
cylinder
transform
into
disordered
micelle
disorder
structure
result
due
EC
becoming
miscible
VBAZ-BZ-2OH
monomer,
disrupting
structure,
was
confirmed
TEM
SAXS
could
easily
understand
order–disorder
morphological
transformation
replace
thermogravimetric
analysis
(TGA)
coupled
microcomputed
gas
chromatography
(TGA-GC)
ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
6(20), С. 12897 - 12905
Опубликована: Окт. 16, 2024
Adhesive
technology
plays
a
crucial
role
in
enabling
durable
and
efficient
bonding
across
wide
range
of
industries,
from
consumer
goods
to
high-tech
fields
such
as
electronics
aerospace.
Traditional
adhesive
materials
are
predominantly
derived
petroleum-based
products,
leading
significant
environmental
energy
challenges
due
overreliance
on
nonrenewable
resources.
In
response,
the
development
eco-friendly
adhesives
renewable
biobased
has
gained
considerable
attention.
However,
fully
often
exhibit
lower
adhesion
strength
compared
their
petroleum-derived
counterparts,
presenting
challenge
field.
this
study,
we
report
design
synthesis
benzoxazine
(FBBA)
with
superior
properties,
excellent
solvent
resistance,
antifreeze
capabilities.
The
is
vanillyl
alcohol
(VA)
difurfurylamine
(DIFFA)
through
solvent-free
Mannich
reaction,
resulting
monomer
DIFFA-VA.
Upon
heating,
DIFFA-VA
undergoes
ring-opening
polymerization,
forming
robust
polymer
network,
Poly(DIFFA-VA),
which
stabilized
synergistic
combination
supramolecular
hydrogen
bonds
covalent
heterocyclic
cross-linking.
This
innovative
strategy
achieves
an
remarkable
ambient
(8.0
MPa),
outstanding
performance
(4.0
MPa
at
−196
°C),
resistance
aqueous
solutions
common
organic
solvents.
Given
its
ultrastrong
strength,
ability
withstand
extreme
temperatures,
shows
great
potential
for
applications
sectors
electronics,
aerospace,
automotive,
where
durability
crucial.
ultrastrong,
antifreeze,
solvent-resistant
feedstocks
not
only
addresses
critical
concerns
but
also
provides
valuable
insights
into
effects
interactions
properties
polymers.
Macromolecular Chemistry and Physics,
Год журнала:
2024,
Номер
unknown
Опубликована: Май 30, 2024
Abstract
Low
surface
free
energy
materials
have
garnered
significant
attention
due
to
their
exceptional
properties
and
extensive
applications,
which
play
a
pivotal
role
in
diverse
fields
such
as
biotechnology,
metallurgical
processes,
electronic
device
manufacturing.
To
investigate
the
influence
of
electron
effect
derived
from
substituents
on
benzoxazine
resins,
three
distinct
monomers,
characterized
by
different
substituent
groups,
are
synthesized.
The
monomer
structures
verified
using
Fourier
transform
infrared
nuclear
magnetic
resonance
spectroscopy.
Differential
scanning
calorimetry
tracks
polymerization
behavior
while
thermogravimetric
analysis
valuates
thermal
stability
resulting
polybenzoxazines.
Then
systematically
investigated
through
contact
angle
measurement
calculation,
facilitating
comprehensive
discussion
impact
energy.
These
findings
demonstrate
that
introducing
trifluoromethyl
leads
substantial
reduction
uncured
resin.
On
other
hand,
there
is
minimal
after
undergoing
elevated
temperature
treatments.
current
study
provides
foundation
understanding
for
further
developing
polymers
with
low
