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Controlled life-time polypropylene
Demková, Eva ; Petruš, Josef (oponent) ; Tocháček, Jiří (vedoucí práce)
The master´s thesis is focused on the characterization of degradation process of polypropylene and polypropylene with statistic copolymer into which manganese (II) stearate and cobalt (II) stearates were added at 0.05, 0.10 and 0.20 wt.% loadings. The aim of the thesis was to prepare the controlled life-time polypropylene. The degradation was studied at varying temperatures and prodegradant loadings. The prodegradants were synthetized and characterized using the FTIR and DSC techniques. Thermooxidation of the tested samples induced the changes in crystallinity, melting points and melt-flow indexes. Tensile strength and other mechanical properties were determined by means of the tensile test. The carbonyl index was determined using FTIR, the thermooxidation stability test was used to determine the activation energies of reactions. The changes in morphology of degraded samples were observed by SEM analysis.
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Plasmochemical treatment of natural fibres
Demková, Eva ; Mazánková, Věra (oponent) ; Přikryl, Radek (vedoucí práce)
This bachelor thesis is focused on plasmochemical surface treatment of natural flax fibres using dielectric barrier discharge and silane coupling agent. Treated fibres were used as reinforcement of composite material with an epoxy matrix. Composite materials were prepared manually, by placing saturated fibres into silicone mold. Mechanical properties of composite materials were determined by bending test, tensile test and dynamic-mechanical analysis (DMA). The presence of a silane coupling agent on the surface of the fibre was detected by EDS analysis. SEM method was also used to determine the effect of plasma on the surface of fibres.
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Controlled life-time polypropylene
Demková, Eva ; Petruš, Josef (oponent) ; Tocháček, Jiří (vedoucí práce)
The master´s thesis is focused on the characterization of degradation process of polypropylene and polypropylene with statistic copolymer into which manganese (II) stearate and cobalt (II) stearates were added at 0.05, 0.10 and 0.20 wt.% loadings. The aim of the thesis was to prepare the controlled life-time polypropylene. The degradation was studied at varying temperatures and prodegradant loadings. The prodegradants were synthetized and characterized using the FTIR and DSC techniques. Thermooxidation of the tested samples induced the changes in crystallinity, melting points and melt-flow indexes. Tensile strength and other mechanical properties were determined by means of the tensile test. The carbonyl index was determined using FTIR, the thermooxidation stability test was used to determine the activation energies of reactions. The changes in morphology of degraded samples were observed by SEM analysis.
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Plasmochemical treatment of natural fibres
Demková, Eva ; Mazánková, Věra (oponent) ; Přikryl, Radek (vedoucí práce)
This bachelor thesis is focused on plasmochemical surface treatment of natural flax fibres using dielectric barrier discharge and silane coupling agent. Treated fibres were used as reinforcement of composite material with an epoxy matrix. Composite materials were prepared manually, by placing saturated fibres into silicone mold. Mechanical properties of composite materials were determined by bending test, tensile test and dynamic-mechanical analysis (DMA). The presence of a silane coupling agent on the surface of the fibre was detected by EDS analysis. SEM method was also used to determine the effect of plasma on the surface of fibres.
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