Direct observation of polymer surface mobility via nanoparticle vibrations

Hojin Kim, Yu Cang, Eunsoo Kang, Bartlomiej Graczykowski, Maria Secchi, Maurizio Montagna, Rodney D. Priestley, Eric M. Furst () and George Fytas ()
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Hojin Kim: University of Delaware
Yu Cang: Max Planck Institute for Polymer Research
Eunsoo Kang: Max Planck Institute for Polymer Research
Bartlomiej Graczykowski: Max Planck Institute for Polymer Research
Maria Secchi: University of Trento
Maurizio Montagna: University of Trento
Rodney D. Priestley: Princeton University
Eric M. Furst: University of Delaware
George Fytas: Max Planck Institute for Polymer Research

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-04854-w

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