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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Recent Advances in Food-Packing, Pharmaceutical and Biomedical Applications of Zein and Zein-Based Materials
Elisângela Corradini,Priscila Schroeder Curti,Adriano B. Meniqueti,Alessandro F. Martins,Adley F. Rubira,Edvani C. Muniz +5 more
TL;DR: The biodegradability and biocompatibility of zein and other inherent properties associated with zein’s structure allow a myriad of applications of such materials with great potential in the near future.
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Food packaging bags based on thermoplastic corn starch reinforced with talc nanoparticles
Olivia Valeria Lopez,Luciana Andrea Castillo,M. Alejandra García,Marcelo A. Villar,Silvia Elena Barbosa +4 more
TL;DR: In this paper, the authors developed packaging bags from thermoplastic corn starch containing talc nanoparticles (0, 1, 3, 3 and 5% w/w) and evaluated the properties of these bags by tensile tests and quasi-static assays.
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A review on present status and future challenges of starch based polymer films and their composites in food packaging applications
TL;DR: In this paper, a review of various processing techniques used to produce starch based polymers and composites with their properties to address the poor properties of starch is presented, including low toxic and good compatibility natural plasticizers are of great interest in the processing of thermoplastic starch.
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Robust and Biodegradable Elastomers Based on Corn Starch and Polydimethylsiloxane (PDMS)
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Effect of amphiphilic molecules on characteristics and tensile properties of thermoplastic starch and its blends with poly(lactic acid)
TL;DR: In this paper, three different types of amphiphilic molecules (Tween 60, linoleic acid, and zein) were used as additives for the production of thermoplastic starch (TPS).
References
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Mechanical and morphological characterization of starch/zein blends plasticized with glycerol
Elisāngela Corradini,Eliton S. Medeiros,Antonio J. F. Carvalho,Antônio Aprígio da Silva Curvelo,Luiz H. C. Mattoso +4 more
TL;DR: In this article, a mixture of starch and zein was prepared by melting in a batch mixer at 160°C, where glycerol was used as plasticizer in contents ranging from 20 to 40 wt % with respect to the starch/zein matrix.
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Plasticized starch/tunicin whiskers nanocomposites 2: Mechanical behavior
M.N. Angles,A. Dufresne +1 more
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Influence of protein addition on rheological properties of amylose- and amylopectin-based starches in excess water
L. L. Chedid,J. L. Kokini +1 more
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Studies of biodegradable thermoplastic amylose/kaolin composites: Fabrication, characterization, and properties
Abstract: Biodegradable thermoplastic amylose/kaolin composites (BTAKC) have been fabricated from glycerol-plasticized amylose (GPA) and inorganic reinforced materials kaolin. Fourier Transform infrared (FTIR) patterns showed that in the BTAKC the CO groups of amylose molecules shifted to the higher wavenumber, while the reactive hydroxyl groups of kaolin in BTAKC shifted to the lower wavenumber. This was caused by the cooperation of strong absorption that existed between kaolin and amylose molecules and hydrogen bonds that formed between the reactive hydroxyl groups of kaolin and the hydroxyl groups of amylose molecules. Kaolin was on the submicron filling transition state and acted as an obstructer. Thermogravimetric analysis (TGA) showed that the mass loss of GPA and BTAKC with 20% kaolin were 15.54 and 13.74% respectively, the thermal stability of BTAKC were improved. When BTAKC was stored for 10 days at Relative Humidity (RH) = 50%, the tensile stress, strain, Young's modulus and breaking energy of BTAKC with 20% kaolin were 9.53 MPa, 65.4%, 149.8 MPa and 1.402 N m respectively. It was obvious that the mechanical properties of BTAKC were greatly improved. X-ray diffraction revealed that kaolin restrained the crystallization of GPA effectively. Water absorption testing indicated that the introduction of kaolin reduced the water absorption of BTAKC, which greatly improve the application property of BTAKC. Scanning electron microscope (SEM) revealed that kaolin was commendably dispersed in GPA. Polym. Compos. 27:309–314, 2006. © 2006 Society of Plastics Engineers