Information Derived from PGSE-NMR ~Ion Diffusion Behavior, Molecular Association, Molecular Weight / Composition Correlation of Synthetic Polymers~

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JEOLnews Volume 46, Number 1,2011 Yasuhiro Hashimoto※1※3, Mie Nayuki※1, Noriko Horiike※1, and Akira Yoshino※2

※1 Asahi Kasei Corporation, Analysis & Simulation Center
※2 Asahi Kasei Corporation, Yoshino Laboratory
※3 Asahi Kasei Corporation, Strategic Planning & Development

Pulse-Field Gradient Spin Echo NMR (PGSE-NMR) can be used to calculate selfdiffusion coefficients of molecules. Since it is possible to determine the self-diffusion coefficient from each individual peak that can be observed in one-dimensional NMR spectra, we can evaluate the self-diffusion coefficients even for a mixture of multiple molecular species. We can also separate each signal by their diffusion coefficients using the DOSY method. Further, it is an important point that the self-diffusion coefficients can be converted into information about the size and molecular weight of the molecules. This method also allows us to link the chemical composition information obtained from the one-dimensional NMR to the self-diffusion coefficients (molecular weight and molecule size) provided by PGSE NMR. Thus, these methods are expected to be very useful in a wide range of material analyses, as will be described below.
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