Abstract
Poly(methyl methacrylate) (PMMA)-C 60 nanocomposites, with compositions in the range 0 ≤ φ C60 wt ≤ 0.05, are shown to exhibit systematic increases in dynamic shear moduli, in glass transition temperature (T g), and in the longest relaxation time of the polymer (τ R) with increasing fullerene concentration. We show that while the φ C60 wt dependence of the plateau modulus can be reconciled with a conventional "filler" effect, the systematic increases in T g and in τ R are associated with specific interactions between the C 60 and the polymer segments. In the melt, these segment-C 60 interactions are proposed to reduce polymer segmental mobility in the vicinity of the particle surface and ultimately suppress polymer dynamics, as measured mechanically, in a manner consistent with an increase in the polymer segmental friction coefficient.
Original language | English (US) |
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Pages (from-to) | 5424-5432 |
Number of pages | 9 |
Journal | Macromolecules |
Volume | 40 |
Issue number | 15 |
DOIs | |
State | Published - Jul 24 2007 |
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry