Polystyrene Solutions: Characterization of Molecular Motional Modes by Spectrally Resolved Low‐ and High‐Field NMR Relaxation

Polystyrene Solutions: Characterization of Molecular Motional Modes by Spectrally Resolved Low‐ and High‐Field NMR Relaxation
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聚苯乙烯溶液:通过光谱分辨低场和高场 NMR 弛豫表征分子运动模式

DOI:
10.1002/macp.201200092
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发表时间:
2012
影响因子:
2.5
通讯作者:
G. Guthausen
G. Guthausen
中科院分区:
化学4区
文献类型:
--
作者:
M. Cudaj;J. Cudaj;T. Hofe;B. Luy;M. Wilhelm;G. Guthausen

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用不同的核磁共振技术研究了聚苯乙烯在CDCl 3中的溶液。扩散测量和光谱分辨的频率依赖性1H纵向弛豫研究提供了一些洞察复杂的分子运动模式和它们的频率依赖性,即纵向弛豫速率的色散。在20 MHz 1H-Larmor频率附近的低磁场下的新可用光谱分辨率还允许区分脂肪族和芳香族光谱贡献,因此,与众所周知的时域或场循环NMR研究相比,可以更详细地描述几MHz频率范围内的分子迁移率。
Polystyrene solutions in CDCl3were examined by different NMR techniques. Diffusion measurements and spectrally resolved frequency‐dependent1H longitudinal relaxation studies give some insight into the complex molecular motional modes and their frequency dependence, that is, the dispersion of the longitudinal relaxation rate. The newly available spectral resolution at low magnetic field around 20 MHz1H‐Larmor frequency additionally allows the differentiation of aliphatic and aromatic spectral contributions and, therefore, a more detailed description of the molecular mobility in the frequency range of several MHz compared to the well‐known time‐domain or field‐cycling NMR studies.
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