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

研究成果: ジャーナルへの寄稿学術誌査読

31 被引用数 (Scopus)

抄録

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 1.25Tg, 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 1.25Tg, 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.

本文言語英語
論文番号032602
ジャーナルPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
88
3
DOI
出版ステータス出版済み - 9月 10 2013

!!!All Science Journal Classification (ASJC) codes

  • 統計物理学および非線形物理学
  • 統計学および確率
  • 凝縮系物理学

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