We present a novel NMR methodology named quantitative adiabatic refocused insensitive nuclei enhanced by polarization transfer (QA-RINEPT) that allows quantitative analysis of polymeric materials in a fast and robust manner. With the aid of adiabatic pulses, QA-RINEPT enables rigorous and controllable polarization transfer to yield 13C NMR spectra with predictable sensitivity enhancement for quantitative analysis. In this talk, we will use examples to show and discuss the reliability and novelty of QA-RINEPT over other existing polarization transfer based methodologies. In particular, QA-RINEPT demonstrates its remarkable capability with polyolefin materials by saving up to 50-60x experimental time. The 13C NMR spectra obtained have been analyzed and compared with the standard quantitative single pulse method by two individual analysts. Analytical results regarding composition and monomer sequence distribution show excellent agreement between different methods and analysts.

Quantitative analysis of polymers using sensitivity enhanced 13C NMR spectroscopy

255th National Meeting (2018)

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