Local Polymer Dynamics in Polymer−C60 Mixtures

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• 作者：Jamie M. Kropka ; Victoria Garcia Sakai ; Peter F. Green
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：8
• 期：4
• 页码：1061 - 1065
• 全文大小：462K
• 年卷期：v.8,no.4(April 2008)
• ISSN：1530-6992

文摘

The complexity of intermolecular interactions in polymer−nanoparticle systems leads to spatial variations in structure and dynamics at both the meso- and nanoscale. Much of this behavior is manifested in properties such as the glass transition and the viscosity. Incoherent neutron scattering measurements of C₆₀−polymer mixtures reveal that local polymer chain backbone motions in the glassy state are suppressed relative to those of the pure polymer. Moreover, the scattering spectrum of the melt suggests that the influence of C₆₀ on polymer dynamics is limited to the vicinity of the particles at nanosecond time scales. A model is presented to reconcile these observations with the bulk dynamical properties exhibited by the mixtures.