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Control of the morphology of biodegradable polymer blends
Ostafińska, Aleksandra ; Šlouf, Miroslav (advisor) ; Kosek, Juraj (referee) ; Vohlídal, Jiří (referee)
This dissertation, entitled »Control of the morphology of biodegradable polymer blends«, has been running parallel with the grant project »Multiphase biodegradable polymer systems« and it represents a new research direction in the Department of morphology and rheology of polymer materials at the Institute of Macromolecular Chemistry. The main idea was to employ our long-lasting work and experience in the field of morphology control of synthetic polymer blends in the very analogous field of the biodegradable polymer blends. We have chosen three most common, widely used and relatively cheap bio-based polymers - starch, poly(lactic acid) and poly(ε-caprolactone) - in order to investigate how the properties of their blends might be improved if we control the blend morphology in targeted, reproducible and well-defined way from the very beginning. It has been well established that morphology (phase structure, supramolecular structure) is one of the key factors influencing final properties of polymer blends, including mechanical performance, rate of (bio)degradation, gas permeability etc. In this work, numerous preliminary experiments showed that there are two systems in which the morphology control could significantly help in the improving of their end-use properties: PLA/PCL/TiX (where PLA = poly(lactic acid),...
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Control of the morphology of biodegradable polymer blends
Ostafińska, Aleksandra ; Šlouf, Miroslav (advisor) ; Kosek, Juraj (referee) ; Vohlídal, Jiří (referee)
This dissertation, entitled »Control of the morphology of biodegradable polymer blends«, has been running parallel with the grant project »Multiphase biodegradable polymer systems« and it represents a new research direction in the Department of morphology and rheology of polymer materials at the Institute of Macromolecular Chemistry. The main idea was to employ our long-lasting work and experience in the field of morphology control of synthetic polymer blends in the very analogous field of the biodegradable polymer blends. We have chosen three most common, widely used and relatively cheap bio-based polymers - starch, poly(lactic acid) and poly(ε-caprolactone) - in order to investigate how the properties of their blends might be improved if we control the blend morphology in targeted, reproducible and well-defined way from the very beginning. It has been well established that morphology (phase structure, supramolecular structure) is one of the key factors influencing final properties of polymer blends, including mechanical performance, rate of (bio)degradation, gas permeability etc. In this work, numerous preliminary experiments showed that there are two systems in which the morphology control could significantly help in the improving of their end-use properties: PLA/PCL/TiX (where PLA = poly(lactic acid),...
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Vývoj fázové struktury při toku polymerních směsí
Fortelný, Ivan
State of art in description of the phase structure development in flowing polymer blends is discussed. It is shown that the rule satisfactorily predicting a type of the phase structure does not exist. Graphic solution of the equation describing dynamic equilibrium between the droplet breakup and coalescence provides satisfactorily prediction of the dependence of average droplet size on system parameters.
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