One-dimensional structure of exfoliated polymer-layered silicate nanocomposites: A polyvinylpyrrolidone (PVP) case study

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@Article{Szczerba2010235,
  author =       "Marek Szczerba and Jan Srodon and Michal Skiba and 
                 Arkadiusz Derkowski",
  title =        "One-dimensional structure of exfoliated
                 polymer-layered silicate nanocomposites: A
                 polyvinylpyrrolidone (PVP) case study",
  journal =      "Applied Clay Science",
  volume =       "47",
  number =       "3-4",
  pages =        "235--241",
  year =         "2010",
  ISSN =         "0169-1317",
  DOI =          "doi:10.1016/j.clay.2009.10.015",
  URL =          "http://www.sciencedirect.com/science/article/B6V8Y-4XJP3TR-3/2/0314c6ad7c842ebe19f51e5fb9e67289",
  keywords =     "genetic algorithms, genetic programming, java,
                 Polyvinylpyrrolidone (PVP), Smectite, X-ray
                 diffraction",
  abstract =     "Classical modelling of powdered lamellar structures by
                 X-ray diffraction (XRD) only applies to periodic or
                 quasi-periodic structures and another approach is
                 needed for non-periodic structures. XRD patterns of the
                 non-periodic structures contain a relatively small
                 amount of information and therefore certain initial
                 assumptions are necessary. In case of exfoliated
                 polymer-clay mineral nanocomposites it is possible to
                 assume the chemical composition and the structure of
                 the clay mineral layer while the actual structure of
                 the polymer remains unknown. This paper offers an
                 approach which can be used to provide an approximate
                 solution for the structure of the polymer. This new
                 approach is based on modeling of the LpG2 factors,
                 recorded from oriented samples in order to obtain the
                 one-dimensional structure of the polymer.

                 Although LpG2 factors for various smectites are quite
                 different, in the case of polyvinylpyrrolidone (PVP)
                 adsorbed on smectite it was found that the structure of
                 the polymer was insignificantly affected by charge in
                 the tetrahedral or octahedral positions of the
                 smectite. The electron density distribution models of
                 PVP directly adsorbed on the smectite layer suggest
                 that PVP chains directly bound to the surface are more
                 rigid and organised than the molecules occurring
                 farther away. The approximate thickness and
                 distribution of PVP layer adsorbed on the surface was
                 calculated to be equal ca. 5-6 A.",
}

Genetic Programming entries for Marek Szczerba Jan Srodon Michal Skiba Arkadiusz Derkowski

Citations