Segmental dynamic heterogeneity of short-chain grafted-poly(dimethylsiloxane) by 1H spin-diffusion NMR

Marko Bertmer, Dan E. Demco, Mingfei Wang, Claudiu Melian, Ramona I. Marcean-Chelcea, Radu Fechete, Maria Baias, Bernhard Blümich

    Research output: Contribution to journalArticle

    Abstract

    Segmental dynamic heterogeneity of short-chain grafted poly(dimethylsiloxane) (PDMS) on pyrogenic silica was investigated using 1H NMR spin-diffusion. A double-quantum dipolar filter was employed for selection of the interface (rigid) region. One-dimensional spin-diffusion equations were solved numerically for a space distribution of spin diffusivity D(x) of the mobile PDMS chains. The degree of heterogeneity can be quantified by the parameters of Gaussian and exponential diffusivity distribution functions which yield similar diffusivities. The rigid and mobile domain sizes and spin diffusivities were correlated with the PDMS chain length, the temperature, and 1H residual dipolar couplings.

    Original languageEnglish (US)
    Pages (from-to)404-409
    Number of pages6
    JournalChemical Physics Letters
    Volume431
    Issue number4-6
    DOIs
    StatePublished - Nov 24 2006

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    diffusivity
    Nuclear magnetic resonance
    nuclear magnetic resonance
    distribution functions
    silicon dioxide
    Chain length
    filters
    Silicon Dioxide
    Distribution functions
    baysilon
    temperature
    Temperature

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

    Cite this

    Bertmer, M., Demco, D. E., Wang, M., Melian, C., Marcean-Chelcea, R. I., Fechete, R., ... Blümich, B. (2006). Segmental dynamic heterogeneity of short-chain grafted-poly(dimethylsiloxane) by 1H spin-diffusion NMR. Chemical Physics Letters, 431(4-6), 404-409. https://doi.org/10.1016/j.cplett.2006.09.092

    Segmental dynamic heterogeneity of short-chain grafted-poly(dimethylsiloxane) by 1H spin-diffusion NMR. / Bertmer, Marko; Demco, Dan E.; Wang, Mingfei; Melian, Claudiu; Marcean-Chelcea, Ramona I.; Fechete, Radu; Baias, Maria; Blümich, Bernhard.

    In: Chemical Physics Letters, Vol. 431, No. 4-6, 24.11.2006, p. 404-409.

    Research output: Contribution to journalArticle

    Bertmer, M, Demco, DE, Wang, M, Melian, C, Marcean-Chelcea, RI, Fechete, R, Baias, M & Blümich, B 2006, 'Segmental dynamic heterogeneity of short-chain grafted-poly(dimethylsiloxane) by 1H spin-diffusion NMR', Chemical Physics Letters, vol. 431, no. 4-6, pp. 404-409. https://doi.org/10.1016/j.cplett.2006.09.092
    Bertmer, Marko ; Demco, Dan E. ; Wang, Mingfei ; Melian, Claudiu ; Marcean-Chelcea, Ramona I. ; Fechete, Radu ; Baias, Maria ; Blümich, Bernhard. / Segmental dynamic heterogeneity of short-chain grafted-poly(dimethylsiloxane) by 1H spin-diffusion NMR. In: Chemical Physics Letters. 2006 ; Vol. 431, No. 4-6. pp. 404-409.
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