Averaging effects in PGSE NMR attenuations observed in bimodal molecular weight PMMA solutions

Scott A. Willis, Gary R. Dennis, Gang Zheng, William S. Price

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    NMR diffusion measurements have proven to be a very powerful technique for probing the solution dynamics of polymer systems. In theory, it is possible to extract a range of useful information including molecular weights from the diffusion data. In practice, especially outside the infinite dilution regime, the data analysis is further complicated by numerous effects including macroscopic and microscopic averaging. Here the averaging effects in dilute bimodal narrow molecular weight poly(methyl methacrylate) in deuterated chloroform solutions are studied at 298 K and cogent models developed to analyze the data. Simulations are performed which represent different limits of diffusive behavior in bimodal solutions and the suitability of the simulations are found to be dependent on the ratio of the molecular weights in the solution.
    Original languageEnglish
    Pages (from-to)7351-7356
    Number of pages6
    JournalMacromolecules
    Volume43
    Issue number17
    DOIs
    Publication statusPublished - 2010

    Keywords

    • PGSE NMR
    • Polymethylmethacrylate

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