The objective is to develop novel theoretical, computational and experimental techniques for the discovery and analysis of polymer blend nanocomposites. We seek the relationship between the nano and micro-scale structural variables and macroscale physical and mechanical properties of compatiblized polymer blends and polymer nanocomposites. Quantification of the interactions in polymer nanocomposites is essential for predicting their morphology and macroscopic properties. However, this quantification is an ongoing challenge due to the lack of a systematic approach that allows measurement of nanoparticle (NP)-polymer and NP-NP interactions. We measure these interaction by colloidal probe atomic force microscopy (CP-AFM). This approach can be used to predict the dispersion of NPs in a variety of mediums including polymers and solvents. To obtain qualitative and quantitative information of the microstructural evolution of these systems during well defined macroscopic flow fields, we employ high temperature confocal-rheology setup. Combining confocal microscope with a rheometer enables imaging of sample morphology in 4D (three spatial dimensions plus time).The applications of interest are in energy storage and conversion. In particular, we are interested in developing solid state electrolytes for Li-ion batteries and battery separators.