Obten?§?￡o de nanocomp?3sito de EVA/s?-lica e caracteriza?§?￡o por resson?￠ncia magn??tica nuclear no estado s?3lido

摘要

Nanocomposites of poly(ethylene-co-vinyl acetate)/silica (SiO2) with dimensions of ca. 40 nm were prepared via solution intercalation employing chloroform as a solvent. They were mainly characterized with nuclear magnetic resonance spectroscopy (NMR) employing carbon-13 (polymeric matrix), silicon-29 (nanoparticles) and through the determination of the proton spin-lattice relaxation time in the rotating frame (T1rH) (polymer matrix). From the NMR results it was inferred that up to 5% of silica in mass a well dispersed nanocomposite was obtained, owing to a strong interaction between silica and the EVA matrix.