Rodlike capsules consisting of a calcium carbonate core and a thin poly(methyl methacrylate) shell were synthesized. For the polymer shells thicker than 20 nm, Tg is not altered from the bulk value, whereas a shell of 8 nm thick exhibits a lowered Tg from the bulk, but the length scale of dynamic heterogeneity ξ(Tg) exhibits no distinct dependence on d. Correlation between ξ(Tg) and Tg was revealed, which is interpreted in terms of the concept of a cooperatively rearranging region.
- Takashi Sasaki
- Rumi Kuroda
- Satoshi Irie