RHEOLOGY OF DISPERSIVE POLYMERIC SYSTEMS

The present dissertation is an examination of the rheological behaviour of dispersed polymer systems. These systems consist of a polymer matrix that provides structural support and nanostructured fillers that modify the material's properties. The primary objective of this study is to determine the impact of the interface - the boundary between the matrix and fillers and filler surface functionalization on the viscoelastic properties of melts, with a particular focus on the material's response to deformation and flow. The present study employs the concept of nanoarchitectonics, a systematic approach for designing and controlling nanoscale interactions. This facilitates the customisation of material properties, thus surpassing the constraints imposed by previous methodologies. A substantial body of previous research has been dedicated to studying individual components or more elementary systems. Such work frequently fails to encompass the complete dynamics present within complex systems, encompassing hierarchical interactions ranging from molecular bonds to macroscopic networks. In contrast, the present work addresses the entire interaction hierarchy. It offers novel insights into the dynamics of polymer systems, improving control over their properties. Consequently, this research achieves significant methodological advancements and addresses gaps identified in prior studies. The present research places particular emphasis on polymer composites containing polymers and fillers. The focus of this study is modified organoclays, which are defined as chemically altered clay minerals. The analysis of these materials employs rheological, thermal, and spectroscopic techniques. The present study demonstrates how interphase interactions influence the viscoelastic properties of polymer nanocomposites. The results establish direct links between interface structure and rheological response, thereby informing the design of adaptive materials.