DETERMINATION OF MONOMER CONFORMATIONS IN NONCRYSTALLINE SOLID POLYMERS BY 2-DIMENSIONAL NMR EXCHANGE SPECTROSCOPY
DETERMINATION OF MONOMER CONFORMATIONS IN NONCRYSTALLINE SOLID POLYMERS BY 2-DIMENSIONAL NMR EXCHANGE SPECTROSCOPY
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DOI：
10.1021/ma00099a038
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发表时间：
1994-10-10
期刊：
影响因子：
5.5
通讯作者：
TYCKO, R
中科院分区：
文献类型：
--
作者：
DABBAGH, G;WELIKY, DP;TYCKO, R
我们提出并展示了一种新的方法来确定非结晶固体中分子或单体的构象。该方法利用二维核磁共振交换光谱，结合特定的同位素标记。我们提出了专门标记聚（甲基丙烯酸甲酯），聚（甲基丙烯酸甲酯）和聚（甲基丙烯酸乙酯）的实验结果。通过对实验和模拟二维光谱的比较，我们确定聚甲基丙烯酸甲酯和聚丙烯酸甲酯的酯侧基具有平面、反式构象，聚甲基丙烯酸乙酯在非结晶固体状态下也以平面、反式构象为主。我们讨论了这种方法在合成聚合物、生物系统和其他无序固体的结构研究中的潜在应用。
We propose and demonstrate a new approach to the determination of the conformations of molecules or monomers in noncrystalline solids. The method makes use of two-dimensional NMR exchange spectroscopy in combination with specific isotopic labeling. We present experimental results on specifically labeled poly(methyl methacrylate), poly(methyl acrylate), and poly(ethyl methacrylate). Through comparisons between the experimental and simulated two-dimensional spectra, we determine that the ester side groups of poly(methyl methacrylate) and poly(methyl acrylate) have planar, trans conformations and that the side groups of poly(ethylmethacrylate) are also predominantly in the planar, trans conformation in the noncrystalline solid state. We discuss potential applications of this approach in structural studies of synthetic polymers, biological systems, and other disordered solids.