title: Quantitative structural characterization of POSS and octavinyl-POSS nanocomposites by solid state NMR.
abstract: The ratio between two different (29)Si atoms in chloromethylphenyl isobutyl Polyhedral Oligomeric Silsesquioxane (POSS) was determined based on the quantitative cross polarization (QCP) (Shu et al., Chem. Phys. Lett. 462 (2008) 125) in solid-state NMR. For a (29)Si/(1)H spin system, cross polarization and depolarization together with the reciprocity relation were performed with optimized experimental conditions. It saves considerable experimental time compared to the (29)Si direct polarization experiment. The same method was further applied to octavinyl-POSS nanocomposites containing perfluoropolyether (PFPE) for deriving directly and accurately the average numbers of reacted vinyl groups, which may not be obtained by combining FTIR and solution (1)H NMR. In principle, the aforementioned method proves to be valuable in quantitative characterization of silicon related structures in bulk materials.
authors.affiliation: Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China.
authors.forename: Huipeng
authors.initials: H
authors.lastname: Zhao
authors.forename: Jie
authors.initials: J
authors.lastname: Shu
authors.forename: Qun
authors.initials: Q
authors.lastname: Chen
authors.forename: Shanmin
authors.initials: S
authors.lastname: Zhang