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Polymeric blends of thermoplastic starch with other biodegradable polymers
 Nováková, Pavlína ; Petruš, Josef (referee) ; Kučera, František (advisor)
The master's thesis deals with the preparation and properties of biodegradable polymer blends of thermoplastic starch (TPS) with polyhydroxybutyrate (PHB) with emphasis on the compatibilization of the immiscible polymer blend. The theoretical part focuses on the characterization of thermoplastic starch, thermodynamics of polymer blends, possible ways of compatibilization of polymer blends and a summary of the current knowledge on polymer blends of thermoplastic starch with biodegradable polymers. The experimental part deals with the modification of starch and PHB with maleic anhydride in order to compatibilize the polymer blend. The binding of the monomer to the polymers was confirmed by infrared spectroscopy and acid-base titration. Subsequently, using the prepared modified polymers, TPS/PHB blends were prepared and the effect of compatibilization and blend composition on the properties was evaluated. Differential scanning calorimetry (DSC) was used to observe the melting and crystallization process, the changes in molecular weight of the polymers were assessed by determining the melt flow index. Tensile strength, elongation at break and the effect of ageing on the mentioned mechanical properties were determined by tensile testing, morphology was observed by electron microscopy (SEM).
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