Atomistic Modelling of Confined Polypropylene Chains between Ferric Oxide Substrates at Melt Temperature

Ali Gooneie, Joamin Gonzalez-Gutierrez, Clemens Holzer

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Abstract

The interactions and conformational characteristics of confined molten polypropylene (PP) chains between ferric oxide (Fe2O3) substrates were investigated by molecular dynamics (MD) simulations. A comparative analysis of the adsorbed amount shows strong adsorption of the chains on the high-energy surface of Fe2O3. Local structures formed in the polymer film were studied utilizing density profiles, orientation of bonds, and end-to-end distance of chains. At interfacial regions, the backbone carbon-carbon bonds of the chains preferably orient in the direction parallel to the surface while the carbon-carbon bonds with the side groups show a slight tendency to orient normal to the surface. Based on the conformation tensor data, the chains are compressed in the normal direction to the substrates in the interfacial regions while they tend to flatten in parallel planes with respect to the surfaces. The orientation of the bonds as well as the overall flattening of the chains in planes parallel to the solid surfaces are almost identical to that of the unconfined PP chains. Also, the local pressure tensor is anisotropic closer to the solid surfaces of Fe2O3 indicating the influence of the confinement on the buildup imbalance of normal and tangential pressures
Original languageEnglish
Pages (from-to)361-380
Number of pages19
JournalPolymers / Molecular Diversity Preservation International
Volume8.2016
Issue number10
DOIs
Publication statusPublished - 14 Oct 2016

Keywords

  • molecular dynamics
  • ferric oxide
  • polypropylene
  • polymer-metal interactions

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