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Overview of NMR of Bulk Polymers

机译:本体聚合物的NMR概述

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摘要

The favorable properties of bulk polymers are primarily due to their molecular structure but also heavily depend on their organization in bulk and their molecular dynamics. Solid state NMR techniques provide unique information on the local conformation of macromolecules as well as time scale and amplitude of rotational motions in bulk. Moreover, translational motions of the chains on mesoscopic length scales can be elucidated by advanced NMR techniques. In order to obtain this information, homo- and heteronuclear dipole-dipole couplings, involving ~1H and heteronuclei such as ~(13)C and ~(15)N, isotropic as well as anisotropic chemical shifts, in particular of ~(13)C, and quadrupole coupling of ~2H are employed. Experiments can be performed on static samples and under magic angle spinning (MAS). Double quantum and multidimensional NMR techniques are especially informative. The methods will be briefly introduced and illustrated by recent experimental examples from different fields of polymer science, such as chain microstructure, defects and dynamics, chain packing in polymers for plastic electronics, proton motion in proton conductors and packing of macrocycles in nanotubes.
机译:本体聚合物的有利性能主要归因于它们的分子结构,但也很大程度上取决于它们的本体结构和分子动力学。固态NMR技术可提供有关大分子的局部构象以及整体时间尺度和旋转运动幅度的独特信息。此外,可以通过先进的NMR技术阐明链在介观长度尺度上的平移运动。为了获得此信息,涉及〜1H和诸如〜(13)C和〜(15)N的杂核的同核和异核偶极-偶极偶合,各向同性以及各向异性的化学位移,特别是〜(13) C,并且采用〜2H的四极耦合。可以在静态样品上并在魔角旋转(MAS)下进行实验。双量子和多维NMR技术尤其有用。将通过高分子科学不同领域的最新实验实例对方法进行简要介绍和说明,例如链微结构,缺陷和动力学,用于塑料电子产品的聚合物中的链堆积,质子导体中的质子运动以及大环在纳米管中的堆积。

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