NEW HYBRID NANOSTRUCTURED ORGANIC-INORGANIC POLYMERIC MATERIALS WITH SILSESQUIOXANE CORES

摘要

The present work discusses the synthesis and some properties of novel hybrid materials based on macromonomers and octafunctional silsesquioxanes (Q8M8~H). α, ω- or ω-undecenyl macromonomers were synthesized by anionic deactivation and characterized by Size Exclusion Chromatography (SEC) to determine molecular weight, and by ~1H NMR (and MALDI-TOF MS for selected samples) to check composition, when the case, and functionality. They were reacted by hydrosilylation with Q8M8~H whereupon chemical links are formed between the precursor chains and the spherosilsesquioxane compound to yield novel hybrid macromolecular star-shaped structures constituted of polyethylene oxide) (PEO) polystyrene (PS), polyisoprene (PI), poly(styrene-b-isoprene) (PS-b-PI) or poly(isoprene-b-styrene) (PI-b-PS) branches and octafunctional silsesquioxane cores. Well defined octafunctional PS, PI or PS-b-PI star-shaped polymers could be obtained. PS and PEO networks could also be synthesized by coupling well-defined aw-diundecenyl PS macromonomers (or α,ω- diallyl PEO macromonomers) with octafunctional silsesquioxanes via hydrosilylation. Some results on the behavior of the PEO or PS networks exhibiting octafunctional silsesquioxane crosslinking points will also be presented.