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 journalArticlepeer-review


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
Issue number4-6
StatePublished - Nov 24 2006

ASJC Scopus subject areas

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


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