Stress Relaxation of Polyisoprene-Laponite Nanocomposites Monitored by Magic Angle Spinning ~1H NMR and Optical Microscopy

G.M.Poliskie; K.K.Gleason

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Stress Relaxation of Polyisoprene-Laponite Nanocomposites Monitored by Magic Angle Spinning ~1H NMR and Optical Microscopy

机译：魔术角旋转〜1H NMR和光学显微镜监测聚异戊二烯-皂石纳米复合材料的应力松弛

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In order to illustrate the capacity of nuclear magnetic resonance(NMR)to monitor compression-induced changes in the morphology of nanocomposites,solid-state NMR results were directly contrasted with optical microscopy.Increases in the interfacial area of Laponite clay in cis 1,4-polyisoprene composites were monitored during uniaxial compression.Interaction of the Co~(+2)in the clay galleries with the polymer decreases the polymer's ~1H spin-lattice relaxation time constant(T_1).The composite showed a decrease in T_1 time constant with increasing compressive strain.This behavior is consistent with an increase in interfacial area of the aggregate as it breaks apart.Increases in interfacial area of the aggregate were confirmed with optical micrographs.

机译：为了说明核磁共振（NMR）监测压缩诱导的纳米复合材料形态变化的能力，将固态NMR结果与光学显微镜直接进行了对比。Laponite粘土在顺式1,4中的界面面积增加-聚异戊二烯复合材料在单轴压缩过程中被监测。Co〜（+2）在粘土画廊中与聚合物的相互作用降低了聚合物的〜1H自旋晶格弛豫时间常数（T_1）。随着压缩的破裂，这种行为与骨料的界面面积的增加是一致的。光学显微照片证实了骨料的界面面积的增加。

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《Polymer Composites》 |2005年第6期|共7页
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G.M.Poliskie; K.K.Gleason;
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1. Stress Relaxation of Polyisoprene-Laponite Nanocomposites Monitored by Magic Angle Spinning ~1H NMR and Optical Microscopy [J] . G.M.Poliskie, K.K.Gleason Polymer Composites . 2005,第6期

机译：魔术角旋转〜1H NMR和光学显微镜监测聚异戊二烯-皂石纳米复合材料的应力松弛
2. Study by ~1H NMR of the Concentration of Monomer-Units on Interface Plymer Grafted on Silica Using Magic Angle Spinning and Relaxation Techniques [J] . T. Tajouri, H. Bouchriha Journal of Colloid and Interface Science . 2002,第2期

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3. Use of Spin Echo Magic Angle Spinning ~1H NMR in Reaction Monitoring in Combinatorial Organic Synthesis [J] . Ravi S. Garigipati, Bruce Adams, Jerry L. Adams, The Journal of Organic Chemistry . 1996,第8期

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Stress Relaxation of Polyisoprene-Laponite Nanocomposites Monitored by Magic Angle Spinning ~1H NMR and Optical Microscopy

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