Determination of Ion Cluster Sizes and Cluster-to-Cluster Distances in Ionomers by Four-Pulse Double Electron Electron Resonance Spectroscopy
Determination of Ion Cluster Sizes and Cluster-to-Cluster Distances in Ionomers by Four-Pulse Double Electron Electron Resonance Spectroscopy
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通过四脉冲双电子共振光谱法测定离聚物中的离子簇尺寸和簇间距离
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
H. Spiess
中科院分区：
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作者：
M. Pannier;V. Schädler;M. Schöps;U. Wiesner;G. Jeschke;H. Spiess
双电子-电子共振(DER)谱是表征聚合物介观结构的一种新工具。这种方法可以在1.5到8 nm的范围内表征自旋探针之间的距离分布，并可以通过使用附着在离子团簇表面的离子自旋探针来测量离子端基聚合物中的离子团簇大小和簇间距离。基于均聚物体系的团簇间距计算结果与前人的小角X射线散射(SAXS)结果一致，而团簇大小可以通过与离子团簇的力场分子模型进行比较而得到合理的解释。Deer实验也可以应用于SAXS无法测量簇间距离的离子封端的两嵌段共聚物。
Double electron-electron resonance (DEER) spectroscopy is introduced as a new tool for the characterization of mesoscopic structures in polymers. This method can characterize distance distributions between spin probes in a range between 1.5 and 8 nm and can be applied to the measurement of ion cluster sizes and intercluster distances in ionically end-capped polymers by using ionic spin probes that attach themselves to the surface of the ion clusters. The results on intercluster distances for systems based on homopolymers are in agreement with earlier results from small-angle X-ray scattering (SAXS), while the cluster sizes can be rationalized by comparison with a force field molecular model of an ion cluster. The DEER experiment could also be applied to an ionically end-capped diblock copolymer for which a SAXS measurement of the intercluster distance failed.