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Modification of polyurethane by biodegradable poly(hydroxybutyrate)
Kupka, Vojtěch ; Žídek, Jan (oponent) ; Vojtová, Lucy (vedoucí práce)
The aim of the presented bachelor thesis was the synthesis of elastomeric polyurethane filled by biodegradable polyhydroxybutyrate. The morphology of samples was analyzed by scanning electron microscopy and mechanical properties were tested by tensile measurement. Moreover, the work deals with prediction of mechanical properties based on rubber elasticity theory. It was found that prepared specimens have a character of particle – reinforced composite materials. Corresponding to divination, the biodegradable filler content enhancement in polyurethane matrix leaded to an increase of the elastic modulus. Prediction of stress-strain curves, which was done by SEC.exe software, showed for real behavior of stress-strain curve having unreal values of network density of polymer chains. While real values of chains network density were used in simulation, stress-strain data were higher than the measured ones.
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Modification of polyurethane by biodegradable poly(hydroxybutyrate)
Kupka, Vojtěch ; Žídek, Jan (oponent) ; Vojtová, Lucy (vedoucí práce)
The aim of the presented bachelor thesis was the synthesis of elastomeric polyurethane filled by biodegradable polyhydroxybutyrate. The morphology of samples was analyzed by scanning electron microscopy and mechanical properties were tested by tensile measurement. Moreover, the work deals with prediction of mechanical properties based on rubber elasticity theory. It was found that prepared specimens have a character of particle – reinforced composite materials. Corresponding to divination, the biodegradable filler content enhancement in polyurethane matrix leaded to an increase of the elastic modulus. Prediction of stress-strain curves, which was done by SEC.exe software, showed for real behavior of stress-strain curve having unreal values of network density of polymer chains. While real values of chains network density were used in simulation, stress-strain data were higher than the measured ones.
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