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Reactive extrusion of polymers by peroxides
Červený, Ladislav ; Petruš, Josef (referee) ; Kučera, František (advisor)
Diploma thesis deals with processing of two types of PP, HDPE, LDPE, PET, PA, PS, PMMA and ABS by reactive extrusion in presence of peroxides. The theoretical part summarizes existing knowledge about processing of used polymers. Reactive extrusion was carried out with a single screw extruder at 260 °C, 30 rpm and 60 rpm depending on peroxide used. One type of PP was processed in presence of Luperox 101, hydrogen peroxide, dicumyl peroxide and potassium persulfate. Luperox 101 and hydrogen peroxide were chosen for reactive extrusion of other polymers. The efficiency of selected peroxides on radical modifications of individual polymers during processing was evaluated by methods of rheological (MFI), structural (FTIR) and thermal (DSC) analysis.
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Rheological study of starch suspensions for surface coatings of glass fibres
Červený, Ladislav ; Řehoř, Radek (referee) ; Klučáková, Martina (advisor)
Bachelor thesis deals with the rheological study of model starch suspension systems which are intended for surface modification of glass fibers. The rheological methods were used to record a course of the gelatinization process in selected types of film-forming starch suspensions. Based on measured data were determined their initial and final gelatinization temperatures which can be used to save energy in the manufacturing process of surface coatings of glass fibers. The increase in apparent viscosity values of the measured samples during the gelatinization confirms that this process is temperature and time dependent.
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Reactive extrusion of polymers by peroxides
Červený, Ladislav ; Petruš, Josef (referee) ; Kučera, František (advisor)
Diploma thesis deals with processing of two types of PP, HDPE, LDPE, PET, PA, PS, PMMA and ABS by reactive extrusion in presence of peroxides. The theoretical part summarizes existing knowledge about processing of used polymers. Reactive extrusion was carried out with a single screw extruder at 260 °C, 30 rpm and 60 rpm depending on peroxide used. One type of PP was processed in presence of Luperox 101, hydrogen peroxide, dicumyl peroxide and potassium persulfate. Luperox 101 and hydrogen peroxide were chosen for reactive extrusion of other polymers. The efficiency of selected peroxides on radical modifications of individual polymers during processing was evaluated by methods of rheological (MFI), structural (FTIR) and thermal (DSC) analysis.
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Rheological study of starch suspensions for surface coatings of glass fibres
Červený, Ladislav ; Řehoř, Radek (referee) ; Klučáková, Martina (advisor)
Bachelor thesis deals with the rheological study of model starch suspension systems which are intended for surface modification of glass fibers. The rheological methods were used to record a course of the gelatinization process in selected types of film-forming starch suspensions. Based on measured data were determined their initial and final gelatinization temperatures which can be used to save energy in the manufacturing process of surface coatings of glass fibers. The increase in apparent viscosity values of the measured samples during the gelatinization confirms that this process is temperature and time dependent.
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