Heterogeneity of spiral wear patterns produced by local heating on amorphous polymers

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dc.contributor.author Rice, Reginald H.
dc.contributor.author Gnecco, Enrico
dc.contributor.author King, William P.
dc.contributor.author Szoszkiewicz, Robert
dc.date.accessioned 2013-08-29T18:33:56Z
dc.date.available 2013-08-29T18:33:56Z
dc.date.issued 2013-08-29
dc.date.issued 2013-08-15
dc.identifier.uri http://hdl.handle.net/2097/16381
dc.description.abstract We report on spiral wear patterns produced at constant angular velocity by hot tip atomic force microscopy (HT-AFM) on surfaces of two common amorphous polymers: polystyrene (PS) and polymethylmethacrylate (PMMA). Topography of these patterns is obtained with regular AFM cantilevers. Topography cross-sections taken from a center of each spiral at a given azimuthal angle Θ relate changes of surface corrugation h[subscript corr] with tangential velocity v of a thermal cantilever. Polymer wear is characterized by a power law h[subscript corr](v) = α(v=v[subscript max])[superscript –β] , which yields a pre-factor α and an exponent β. Below the glass transition temperature T[subscript g], α is polymer specific and β varies weakly between similar conditions and samples. Variations of β are hypothesized to reflect polymer relaxation processes, which are expected to vary only weakly between amorphous polymers. At and above T[subscript g], α approaches initial thermal tip indentation depth within a polymer, β plummets, and a power law relation of h[subscript corr] with v diverges. These results are explained by heterogeneous wear around T[subscript g] due to a local nature of glass transition. At all studied temperatures, additional wear heterogeneities are found as due to position on the polymer and Θ. Variations of α and β with position on the polymer are found to be only marginally larger then uncertainties of the thermal tip-polymer interface temperature. Variations of α and β with Θ are found to be largely influenced by buckling of thermal cantilevers traveling in a spiral pattern. en_US
dc.language.iso en_US en_US
dc.relation.uri https://doi.org/10.1016/j.matchemphys.2013.05.046 en_US
dc.rights This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
dc.rights.uri http://rightsstatements.org/vocab/InC/1.0/
dc.subject Spiral wear patterns en_US
dc.subject Nanostructures en_US
dc.subject Polymers en_US
dc.subject Atomic force microscopy (AFM) en_US
dc.subject Wear en_US
dc.title Heterogeneity of spiral wear patterns produced by local heating on amorphous polymers en_US
dc.type Article (author version) en_US
dc.date.published 2013 en_US
dc.citation.doi 10.1016/j.matchemphys.2013.05.046 en_US
dc.citation.epage 481 en_US
dc.citation.issue 1 en_US
dc.citation.jtitle Materials Chemistry and Physics en_US
dc.citation.spage 477 en_US
dc.citation.volume 141 en_US
dc.contributor.authoreid szosz en_US


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