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The Influence of Organo-Clay Ratio in the HIPS-OMMT Nanocomposites Analyzed by Proton Spin-Lattice and Spin-Spin relaxation times

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Materials Sciences and Applications 2016年第3期7卷 150-158页

作者： Paulo Sérgio Rangel Cruz da Silva Lívia Rodrigues Menezes Maria Inês Bruno Tavares Institute of Macromolecules Professor Eloisa Mano Federal University of Rio de Janeiro Rio de Janeiro Brazil

Spin-lattice and spin-spin relaxation times are one of the most attractive tools in the solid-state nuclear magnetic resonance spectroscopy to evaluate the level of clay dispersion in the nanocomposite matrices. The efficiency of the relaxation processes can be used to evaluate the nanoparticles intermolecular interactions and, consequently, the dispersion of them in the polymer matrix, the molecular dynamic of the hybrid compounds, as well as the molecular domains formation in an organic material. The determination of relaxation parameters was carried out to evaluate the organoclay exfoliation and intercalation process in the polymeric matrix, in addition to their dispersion and distribution in the matrix. The proton NMR relaxation data showed that the polymeric nanomaterials investigated presented good intermolecular interaction that promoted good nanoparticles dispersion and distribution in the hybrid materials. The proportion of 2% clay promoted a greater heterogeneity in the matrix compared to other ratios;1% clay influenced only to the higher molecular rigidity phase;and 3% clay had a decrease in heterogeneity compared to 2% though still influenced the matrix as a whole. These results prove the efficiency of NMR technique in the evaluation of nanofillers interaction with polymer matrices, as well as their dispersion and distribution.

关键词： Polymeric Nanocomposites Nanoparticles relaxation times NMR

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INTERACTION BETWEEN AN EDGE DISLOCATION AND A CIRCULAR INCLUSION WITH INTERFACE SLIP AND DIFFUSION

INTERACTION BETWEEN AN EDGE DISLOCATION AND A CIRCULAR INCLU...

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第二届亚洲功能材料与结构力学大会

作者： Ernie Pan School of Mechanical Engineering Zhengzhou University Department of Civil Engineering University of Akron

＜正＞We investigate in detail the transient response induced by an edge dislocation near a circular elastic inclusion with simultaneous interface slip and diffusion.A rigorous solution in series form to the interaction problem is *** the time approaches infinity,our solution just recovers the classical one derived by Srolovitz at al.（1984） for fully relaxed boundary *** addition we observe that the edge dislocation will induce a uniform rigid body rotation in the

关键词： Edge dislocation Interface diffusion Interface slip relaxation times Image force

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