Nanocomposites from Clay, Cellulose Nanofibrils, and
Epoxy with Improved Moisture Stability for Coatings and Semistructural
Applications
Lilian Medina
Farhan Ansari
Federico Carosio
Michaela Salajkova
Lars A. Berglund
10.1021/acsanm.9b00459.s001
https://acs.figshare.com/articles/journal_contribution/Nanocomposites_from_Clay_Cellulose_Nanofibrils_and_Epoxy_with_Improved_Moisture_Stability_for_Coatings_and_Semistructural_Applications/8040860
A new type of high
reinforcement content clay–cellulose–thermoset
nanocomposite is proposed, where epoxy precursors diffuse into a wet
porous clay–nanocellulose mat, followed by curing. The processing
concept was scaled to >200 μm thickness composites, the mechanical
properties were high for nanocomposites, and the materials showed
better tensile properties at 90% RH compared with typical nanocellulose
materials. The nanostructure and phase distributions were studied
using transmission electron microscopy; Young’s modulus, yield
strength, ultimate strength, and ductility were determined as well
as moisture sorption, fire retardancy, and oxygen barrier properties.
Clay and cellulose contents were varied as well as the epoxy content.
Epoxy had favorable effects on moisture stability and also improved
reinforcement effects at low reinforcement content. A more homogeneous
nano- and mesoscale epoxy distribution is still required for further
property improvements. The materials constitute a new type of three-phase
nanocomposite, of interest as coatings, films, and laminated composites
for semistructural applications.
2019-04-17 00:00:00
Cellulose Nanofibrils
nanocellulose materials
processing concept
moisture stability
Semistructural Applications
three-phase nanocomposite
reinforcement effects
moisture sorption
property improvements
type
semistructural applications
oxygen barrier properties
reinforcement content
strength
Moisture Stability
transmission electron microscopy
RH
fire retardancy
phase distributions
cellulose contents
clay