Publikation: Modification of polymer surfaces with respect to their lubrication properties
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The aim of this work is to utilise and combine the knowledge gained in the study of model systems and the inspiration from biological systems for the investigation of the interfacial properties of a new type of system, polymer surfaces exposing a self assembled polymeric surfactant. An analogous system, polyethylene, though with no surface coating, is used for artificial body implants in synovial joints.
The thesis deals with surface-related phenomena and bulk phase behaviour that originate from the incorporation of different additives into the initial homopolymer. In the first section, the behaviour of a linear block copolymer?homopolymer blend was examined. In the second part, properties of a grafted block copolymer incorporated into the matrix film were investigated. It was found that the lubrication was enhanced by almost one order of magnitude. From the findings of the second part it is also possible to gain a general understanding of the nature of polymers that lead to lubrication-enhancing surface coatings. Further studies can lead to a transfer of this knowledge to other systems, for instance coatings for bearings in engines or computer hard discs.
The main structural and depth-profiling experimental investigations were carried out using small angle neutron scattering and nuclear reaction analysis. The characterisations of the surface properties were performed mainly with optical phase interference microscopy, atomic force microscopy and contact angle measurements. To examine the friction between the sheared modified and non-modified polymer surfaces a surface force balance was used and modified according to the purposes.
Zusammenfassung in einer weiteren Sprache
Polymeric materials for specific applications are often chosen according to their bulk properties. However, they interact with the surrounding via their surfaces. Thus, interfacial compatibility or incompatibility (hydrophobic, hydrophilic) can determine the suitability of the materials. Issues of adhesion and lubrication are important and the ability to design polymeric interfaces offers a large variety of tailor-made solutions for different systems.
The aim of the research described in this thesis is to design a surface layer, with the ability to spontaneously form from a bulk reservoir and with the possibility of self-healing or recovering from damage.
Previous studies of friction in model systems, for example polymer chains permanently attached to a hard surface and their lubrication enhancing behaviour, showed the same effect. In addition, here the polymer chains enhanced the lubricating properties dramatically relative to monomeric lubricants. At quite high pressures between the polymer-brush-coated mica surfaces, the surfaces on sliding experienced a shear response that was lower than the resolution of the surface force balance (< 100 nN). The lubricating effect of polymers end-attached to a surface occurs because such polymer chains can support a large normal load while maintaining a very fluid interface due to very weak mutual interpenetration.
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HEUBERGER, Marcus, 2001. Modification of polymer surfaces with respect to their lubrication properties [Dissertation]. Konstanz: University of KonstanzBibTex
@phdthesis{Heuberger2001Modif-8858, year={2001}, title={Modification of polymer surfaces with respect to their lubrication properties}, author={Heuberger, Marcus}, address={Konstanz}, school={Universität Konstanz} }
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