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Nanocomposites from Clay, Cellulose Nanofibrils, and Epoxy with Improved Moisture Stability for Coatings and Semistructural Applications
journal contribution
posted on 2019-04-17, 00:00 authored by Lilian Medina, Farhan Ansari, Federico Carosio, Michaela Salajkova, Lars A. BerglundA 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.
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Cellulose Nanofibrilsnanocellulose materialsprocessing conceptmoisture stabilitySemistructural Applicationsthree-phase nanocompositereinforcement effectsmoisture sorptionproperty improvementstypesemistructural applicationsoxygen barrier propertiesreinforcement contentstrengthMoisture Stabilitytransmission electron microscopyRHfire retardancyphase distributionscellulose contentsclay
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