Dynamical crossover between hyperdiffusion and subdiffusion of polymer-grafted nanoparticles in a polymer matrix

Taiki Hoshino, Daiki Murakami, Yoshihito Tanaka, Masaki Takata, Hiroshi Jinnai, Atsushi Takahara

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The dynamical behavior of polystyrene-grafted silica nanoparticles dispersed in an atactic polystyrene matrix was studied using x-ray photon correlation spectroscopy. The time-autocorrelation functions were subjected to fitting analyses based on continuous-time random walk models. The nanoparticles exhibited non-Brownian behavior, and as the temperature increased, the crossover from hyperdiffusion to subdiffusion occurred at 1.25T g , where T g is the glass transition temperature of the matrix polystyrene. Hyperdiffusive behavior is caused by the dynamical heterogeneity of the polymer matrix associated with the glass transition. When the temperature was higher than 1.25T g , the interaction of the grafted polymers with the polymer matrix became relatively significant, and caused a dramatic change in the dynamical behavior of the nanoparticles.

Original languageEnglish
Article number032602
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume88
Issue number3
DOIs
Publication statusPublished - Sep 10 2013

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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