Abstract
Polyhedral oligomeric silsesquioxanes (POSS) are perfect three-dimensional elemental building blocks that can be used for construction of diverse inorganic/organic hybrid materials. Well-defined inorganic frameworks, tailor-made physicochemical properties and symmetric distribution of organic groups make the hybrid organo-silica compounds ideal nano-fillers for polymer composites. Understanding the phenomena directing the molecular packing morphology of neat polyhedral silsesquioxanes is very important for an effective control of hierarchal structures and physicochemical properties of POSS-based hybrid materials, especially for the adjustment of polymer-nanoparticle interfacial interactions.
The segmental dynamics of POSS derivatives in hybrid nanomaterials can be strongly influenced by their structural features. The review presents an analysis of intrinsic self-assembly behaviour of polyhedral silsesquioxanes and their derivatives including capability of the formation of more complex hierarchical superstructures in solid state. The stability of the formed self-assembled structures was analyzed with special regard to thermally induced solid-solid state phase transitions. The role of hierarchical structures present in a range of POSSbased advanced materials, including amphiphilic macromolecules, nanoparticles and liquid crystals is discussed.Keywords: Polyhedral silsesquioxanes, self-assembly, crystal structure, solid-state interactions, plastic crystals, mesomorphic transitions.
Graphical Abstract
Call for Papers in Thematic Issues
Catalytic C-H bond activation as a tool for functionalization of heterocycles
The major topic is the functionalization of heterocycles through catalyzed C-H bond activation. The strategies based on C-H activation not only provide straightforward formation of C-C or C-X bonds but, more importantly, allow for the avoidance of pre-functionalization of one or two of the cross-coupling partners. The beneficial impact of ...read more
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