Preparation and characterization of thermoplastic starch/zein blends
Elisângela Corradini,Antonio J. F. Carvalho,Antônio Aprígio da Silva Curvelo,José Augusto Marcondes Agnelli,Luiz H. C. Mattoso +4 more
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TLDR
The use of zein in thermoplastic starch compositions causes a decrease in the water sensitivity of these materials and lower its melt viscosity during processing making zein a suitable and very promising component in TPS compositions as mentioned in this paper.Abstract:
Blends of starch and zein plasticized with glycerol were prepared by melting processing in an intensive batch mixer connected to a torque rheometer at 160 °C. The resulting mixtures were compression molded and then characterized by scanning electron microscopy, differential scanning calorimetry, wide-angle X ray diffraction and water-absorption experiments. The blends were immiscible, showing two distinct phases of starch and zein. The water uptake at equilibrium and its diffusion coefficient were determined. The water uptake at equilibrium decreased with increasing zein content. The diffusion coefficient fell sharply on addition of 20% zein and remained constant as zein content was increased. No appreciable effect of zein on starch crystallization was observed by X ray diffraction. The use of zein in thermoplastic starch compositions causes a decrease in the water sensitivity of these materials and lower its melt viscosity during processing making zein a suitable and very promising component in TPS compositions.read more
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Effect of carboxylic acids as compatibilizer agent on mechanical properties of thermoplastic starch and polypropylene blends.
TL;DR: Results showed that carboxylic acids, specifically C14, could be used as compatibilizer agent and could substitute PPgMA, and showed that the highest increase in the impact strength was achieved with C14 incorporation.
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Crystalline morphology of thermoplastic starch/talc nanocomposites induced by thermal processing.
Luciana Andrea Castillo,Luciana Andrea Castillo,Olivia Valeria Lopez,Maria Alejandra Garcia,Silvia Elena Barbosa,Silvia Elena Barbosa,Marcelo A. Villar,Marcelo A. Villar +7 more
TL;DR: Talc incorporation did not require the adjustment of processing parameters in order to obtain a homogenous thermoplastic material, with an adequate particles distribution within the matrix, and Regardless talc presence, plasticized starch presented a Vh-type crystalline structure.
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Plasticizing and anti-plasticizing effects of polyvinyl alcohol in blend with thermoplastic starch
Fatemeh Kahvand,Mohammad Fasihi +1 more
TL;DR: Thermoplastic starch and polyvinyl alcohol blends were prepared by extrusion method in the presence of water/glycerol and citric acid, and their phase behavior was investigated, revealing high compatibility between two phases, starch and PVA.
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The effect of LiCF3SO3 on the complexation with potato starch-chitosan blend polymer electrolytes
TL;DR: In this article, the effect of lithium trifluoromethanesulfonate (LiCF3SO3) and glycerol on the conductivity and dielectric properties of potato starch-chitosan blend-based electrolytes was examined.
Book
Natural Polymers : Industry Techniques and Applications
TL;DR: In this paper, the most recent innovations in natural polymer applications in the food, construction, electronics, biomedical, pharmaceutical, and engineering industries are discussed, and the authors provide perspectives from their respective range of industries covering classification, extraction, modification, and application of natural polymers from various sources in nature.
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