Diffusion ordered <sup>1</sup>H NMR (DOSY) becoming a powerful tool to characterize molecular weights of polymers. Compared to common characterization techniques such as gel permeation chromatography (GPC), DOSY is faster, uses less solvent, and does not require a purified polymer sample. Determination of molecular weights were achieved by the linear correlation between the logarithm of diffusion coefficient (D) and the logarithm of the molecular weights based on an external calibration curve. Here, we emphasize the importance of the preparation needed to generate the calibration curve which includes choosing the correct pulse sequence, parameters, and sample preparation. Additionally, we focus on the accuracy of the calibration curve by varying the degree of the polydispersity, creation of the calibration curve, and the introduction of a new calibration curve for polybutadiene.

Utilizing DOSY NMR for determination of polymer molecular weights

ACS Spring 2022

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