Fast and effective structural/compositional analysis on formulated systems represents one of the major challenges encountered in analytical science. 13C detected NMR diffusion represents a promising tool to tackle the above challenges, particularly in industry. Toward exploring the generic applications of 13C detected NMR diffusion, thermal convection induced by 1H decoupling has been identified as a key factor that resulted in significant reduced resolution in the diffusion dimension. Optimization of experimental parameters and utilizing double stimulated echo based pulse sequence both can effectively suppress the thermal convection caused by the 1H decoupling, the success of which allows robust and generic applications of 13C detected diffusion to systems from mixtures of small molecules, polymer blends and copolymers, to actual complex formulated systems. The method is particularly powerful in differentiating small molecules from polymers, polymer blends from copolymers, and in end group analysis.

Generic applications of 13C detected NMR diffusion to formulated systems with suppression of thermal convection

251st National Meeting (2016)

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