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Abstract
Polymer-clay nanocomposites (PCN) based on cassava starch, synthetic hectorite clay and inverted sugar cane syrup (plasticizer) were prepared by solvent-assisted (casting) process producing transparent and homogeneous films. Small amounts of clay (5-15 wt.%) resulted mainly in exfoliated nanocomposites while large amounts (30 wt.%) promote the intercalated nanocomposites formation. FT-Raman bands sensitive to hydrogen bonding in starch granules are progressively shifted to lower wavenumbers as the clay content is raised. Nanocomposites show a similar thermal behavior up to 320 oC while the biomolecule decomposition at about 500 oC is dependent on the clay content. CO2 release at about 300 oC (non-oxidative decomposition of polymeric chains) decreases if compared to the gas delivery at ca. 500 oC, as the clay content is increased. Films with clay content higher than 10 wt.% show no substantial benefit for either elongation or resistance properties.
Highlights
Polymer-clay nanocomposites (PCN) based on the assembly between polymers and layered nano-sized inorganic fillers have received considerable worldwide attention over the last twenty years.[1,2,3,4,5,6,7,8] In such materials, the synergistic interaction between the organic and inorganic phases may give rise to materials with new properties that are not present in the individual pristine parts
Amylose is responsible for the film-forming capacity of starch based films[44] due to its higher tendency to interact through hydrogen bonds and generating stiffer and stronger films when compared to amylopectin.[45]
These results indicate that starch in Cas-Lap is progressively less crystalline as the amount of Laponite is increased in agreement with X-ray diffraction (XRD) data
Summary
Polymer-clay nanocomposites (PCN) based on the assembly between polymers and layered nano-sized inorganic fillers have received considerable worldwide attention over the last twenty years.[1,2,3,4,5,6,7,8] In such materials, the synergistic interaction between the organic and inorganic phases may give rise to materials with new properties that are not present in the individual pristine parts. Polymer-clay nanocomposites (PCN) based on cassava starch, synthetic hectorite clay and inverted sugar cane syrup (plasticizer) were prepared by solvent-assisted (casting) process producing transparent and homogeneous films.
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