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Polymers 2016, 8(10), 361; doi:10.3390/polym8100361

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

Chair of Polymer Processing, Montanuniversitaet Leoben, Leoben 8700, Austria
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Academic Editor: Xianqiao Wang
Received: 6 September 2016 / Revised: 7 October 2016 / Accepted: 11 October 2016 / Published: 14 October 2016
(This article belongs to the Special Issue Computational Modeling and Simulation in Polymer)
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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. View Full-Text
Keywords: molecular dynamics; ferric oxide; polypropylene; polymer-metal interactions molecular dynamics; ferric oxide; polypropylene; polymer-metal interactions
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Gooneie, A.; Gonzalez-Gutierrez, J.; Holzer, C. Atomistic Modelling of Confined Polypropylene Chains between Ferric Oxide Substrates at Melt Temperature. Polymers 2016, 8, 361.

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