This work analyzed the effect of talc morphology on structural characteristics and final properties of
thermoplastic corn starch (TPS). In this sense, composite films based on TPS containing talc nanoparticles
were obtained by melt-mixing and thermo-compression. Talc samples with different morphological
characteristics (platy-microcrystalline and blocky-macrocrystalline), derived from their formation process,
were used. Platy and blocky morphology was distinguished by Scanning Electron Microscopy
performed on composites films. Microcrystalline morphology induced smaller TPS crystallites than
macrocrystalline one, indirectly evidenced by X-Ray Diffraction and Differential Scanning Calorimetry.
Crystalline character of talc particles also affected visible and UV barrier capacity of TPS films. Blocky
morphology of mineral filler led to the highest reduction of TPS water vapor permeation. Both talc
samples acted as matrix reinforcement agents. However, macrocrystalline particles induced the major
changes on elastic modulus and tensile strength, without affecting films ductility.
This work analyzed the effect of talc morphology on structural characteristics and final properties ofthermoplastic corn starch (TPS). In this sense, composite films based on TPS containing talc nanoparticleswere obtained by melt-mixing and thermo-compression. Talc samples with different morphologicalcharacteristics (platy-microcrystalline and blocky-macrocrystalline), derived from their formation process,were used. Platy and blocky morphology was distinguished by Scanning Electron Microscopyperformed on composites films. Microcrystalline morphology induced smaller TPS crystallites thanmacrocrystalline one, indirectly evidenced by X-Ray Diffraction and Differential Scanning Calorimetry.Crystalline character of talc particles also affected visible and UV barrier capacity of TPS films. Blockymorphology of mineral filler led to the highest reduction of TPS water vapor permeation. Both talcsamples acted as matrix reinforcement agents. However, macrocrystalline particles induced the majorchanges on elastic modulus and tensile strength, without affecting films ductility.
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