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Direct observation of polymer surface mobility via nanoparticle vibrations

Author(s): Kim, H; Cang, Y; Kang, E; Graczykowski, B; Secchi, M; et al

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Abstract: Measuring polymer surface dynamics remains a formidable challenge of critical importance to applications ranging from pressure-sensitive adhesives to nanopatterning, where interfacial mobility is key to performance. Here, we introduce a methodology of Brillouin light spectroscopy to reveal polymer surface mobility via nanoparticle vibrations. By measuring the temperature-dependent vibrational modes of polystyrene nanoparticles, we identify the glass-transition temperature and calculate the elastic modulus of individual nanoparticles as a function of particle size and chemistry. Evidence of surface mobility is inferred from the first observation of a softening temperature, where the temperature dependence of the fundamental vibrational frequency of the nanoparticles reverses slope below the glass-transition temperature. Beyond the fundamental vibrational modes given by the shape and elasticity of the nanoparticles, another mode, termed the interaction-induced mode, was found to be related to the active particle–particle adhesion and dependent on the thermal behavior of nanoparticles.
Publication Date: 2018
Citation: Kim, H, Cang, Y, Kang, E, Graczykowski, B, Secchi, M, Montagna, M, Priestley, RD, Furst, EM, Fytas, G. (2018). Direct observation of polymer surface mobility via nanoparticle vibrations. Nature Communications, 9, doi:10.1038/s41467-018-04854-w
DOI: doi:10.1038/s41467-018-04854-w
Pages: 1 - 11
Type of Material: Journal Article
Journal/Proceeding Title: Nature Communications
Version: Final published version. This is an open access article.

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