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Solution Properties of Polymer Nanostructures Studied by Scattering Techniques
(2009)
- The main aim of this thesis is to understand the solution properties of flexible cylindrical polymer brushes, dendronized polymers and the thermosensitive microgel systems. The work comprises of different polymer nanostructured systems mainly studied by using the scattering techniques at the solution state . The importance of the studying the solution properties of the polymer systems can be related to the solution related applications. In this context the solution properties of the flexible cylindrical brushes and spherical microgels are studied at dilute and semi dilute concentration regime by using scattering techniques. The structure of the cylindrical polymer brushes and understanding the conformational changes of the flexible cylinders with the concentration was especially studied by using the small angle neutron scattering (SANS) and small angle light scattering (SLS). The change in dynamics of the cylindrical polymer brushes at the dilute and semi-dilute concentration regimes was studied by using the dynamic light scattering. The thermodynamic transition and kinetics of the cylindrical thermosensitive dendronized polymers to fully reversible mesoglobule structure formation at high temperature conditions (above than lower critical solution temperature) was studied by using the dynamic light scattering. The kinetics of the mesoglobule formation is carefully examined by using the time resolved dynamic light scattering measurements. The aim of this thesis is not only the study of the cylindrical brushes but also to understand the dynamics of the spherical microgel system. The last part of the thesis is focused on the solution dynamics (translational and the rotational dynamics) of the thermosensitive core shell microgel characterized by using the polarized and depolarized dynamic light scattering. In order to understand the shape fluctuations, the coupling phenomenon of the microgel and the influence in the rotational dynamics by embedding the nanoparticles within the thermosensitive shell is studied by the light scattering technique.
