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The Evaluation Polymeric Nanocomposites from Nuclear Magnetic Resonance Relaxometry

Authors:
Maria Ines Bruno Tavares
Paulo Sergio da Silva
Emerson da Silva
Cintia Legramanti
Adriano Passos
Roberto Cucinelli Neto

Keywords: polymeric nanocomposites; nanoparticles; rexalation times; nuclear magnetic resonance

Abstract:
Solid-state Nuclear Magnetic Resonance (NMR) has many techniques that include hydrogen nuclear relaxation times, such as: spin-lattice relaxation time in the laboratory frame (T1H) and spin-lattice relaxation in the rotating frame (T1ρH). These relaxation parameters involve changes in thermal equilibrium of spin systems and the hydrogen relaxation times can be measured directly, using low-field NMR. The efficiency of the process can be correlated with the structure and the value is intrinsically related to the system’s morphology; consequently, the relaxation times can be used to evaluate the nanoparticles’ dispersion in the polymer matrix; the interaction between both nanocomposite components; the molecular dynamic of the hybrid compounds and also the molecular domains formation in an organic material. This feature makes these techniques good tool to analyze the molecular dynamics of polymer systems, as well as the nanocomposites. In this work, we want to show the evaluation of polymeric nanocomposites formation employing the determination of proton spin-lattice relaxation time, using low-field nuclear magnetic resonance. The nanocomposites were mainly characterized by solid state nuclear magnetic resonance relaxometry through the determination of proton spin-lattice relaxation time. The determination of this parameter was carried out to evaluate the organoclay exfoliation and intercalation process in the polymeric matrix, for samples using organoclay as a nanoparticle, as well as the dispersion and distribution of them along the macromolecular chains; this parameter was also used to detect the dispersion and distribution of the spherical and tubular nanoparticles in the polymeric matrix. The proton NMR relaxation data showed that the polymeric nanomaterials investigated presented good nanoparticle dispersion and the distribution, as well as the intermolecular interactions between hybrids components.

Pages: 52 to 55

Copyright: Copyright (c) IARIA, 2012

Publication date: August 19, 2012

Published in: conference

ISSN: 2308-3530

ISBN: 978-1-61208-214-1

Location: Rome, Italy

Dates: from August 19, 2012 to August 24, 2012