| Study of entangled network formation in concentrated solutions of polymer by ~(13)C NMR |
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| 作者姓名： | 毛诗珍 倪少儒 杜有如 沈联芳 |
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| 作者单位： | Laboratory of Magnetic Resonance and Atomic and Molecular Physics，Chinese Academy of Sciences，Wuhan 430071，China，Laboratory of Magnetic Resonance and Atomic and Molecular Physics，Chinese Academy of Sciences，Wuhan 430071，China，Laboratory of Magnetic Resonance and Atomic and Molecular Physics，Chinese Academy of Sciences，Wuhan 430071，China，Laboratory of Magnetic Resonance and Atomic and Molecular Physics，Chinese Academy of Sciences，Wuhan 430071，China |
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| 摘 要： | Information about the exact location of topological and cohesional entanglements at molecular level has been obtained by 13C NMR relaxation analysis. The results show that about 20% of the carbon atoms in the main chain are entangled in the 25% (by weight) solution, which is independent of the content of the 1,2-segment in polybutadiene and of the kind of solvent. However, the entanglement of the carbon atone on the end group of the side chain is very weak, they behave as slipping freely at the junctions.
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Study of entangled network formation in concentrated solutions of polymer by ~(13)C NMR |
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| MAO Shizhen NI Shaoru,DU Youruand SHEN Lianfang.Study of entangled network formation in concentrated solutions of polymer by ~(13)C NMR[J].Science in China(Chemistry),1996(2). |
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| Authors: | MAO Shizhen NI Shaoru DU Youruand SHEN Lianfang |
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| Abstract: | Information about the exact location of topological and cohesional entanglements at molecular level has been obtained by 13C NMR relaxation analysis. The results show that about 20% of the carbon atoms in the main chain are entangled in the 25% (by weight) solution, which is independent of the content of the 1,2-segment in polybutadiene and of the kind of solvent. However, the entanglement of the carbon atone on the end group of the side chain is very weak, they behave as slipping freely at the junctions. |
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| Keywords: | NMR relaxation entanglement polybutadiene biexponential |
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