Analisi NMR allo stato solido multinucleo di coating ibridi organici-inorganici con migliorate proprietà barriera.

Organic-inorganic hybrid coatings can be used to improve the barrier of plastic films against oxygen diffusion. This work aims at investigating by means of solid-state multinuclear NMR (29Si, 13C, 1H) the molecular structural and dynamic properties of hybrid coatings obtained by the sol-gel method by reacting tetraethoxysilane with trialkoxysilane terminated polyethylene-b-poly(ethylene glycol) copolymer and poly(4-hydroxystyrene). Attention has been directed to the attempt of clarifying the role of hydroxystyrene and in particular its capability to form hydrogen bonds with either the organic or the inorganic components, as well as to highlight possible structural and dynamic differences in both the inorganic and organic domains among samples with different compositions. Correlations between molecular properties and oxygen barrier performances have been hypothesized on the basis of the solid-state NMR results.