Article abstract
Nature Materials 4, 693 - 698 (2005)
doi:10.1038/nmat1447
Subject Categories: Polymers | Nanoscale materials | Surface and thin films
Quantitative equivalence between polymer nanocomposites and thin polymer films
Amitabh Bansal1,2,3, Hoichang Yang2,4, Chunzhao Li2,5, Kilwon Cho4, Brian C. Benicewicz2,5, Sanat K. Kumar2,6 and Linda S. Schadler1,2
Abstract
The thermomechanical responses of polymers, which provide limitations to their practical use, are favourably altered by the addition of trace amounts of a nanofiller. However, the resulting changes in polymer properties are poorly understood, primarily due to the non-uniform spatial distribution of nanoparticles. Here we show that the thermomechanical properties of 'polymer nanocomposites' are quantitatively equivalent to the well-documented case of planar polymer films. We quantify this equivalence by drawing a direct analogy between film thickness and an appropriate experimental interparticle spacing. We show that the changes in glass-transition temperature with decreasing interparticle spacing for two filler surface treatments are quantitatively equivalent to the corresponding thin-film data with a non-wetting and a wetting polymer–particle interface. Our results offer new insights into the role of confinement on the glass transition, and we conclude that the mere presence of regions of modified mobility in the vicinity of the particle surfaces, that is, a simple two-layer model, is insufficient to explain our results. Rather, we conjecture that the glass-transition process requires that the interphase regions surrounding different particles interact.
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
- Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
- GE Global Research Center, Niskayuna, New York 12309, USA
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Korea
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
Correspondence to: Sanat K. Kumar2,6 e-mail: kumar@rpi.edu
Correspondence to: Linda S. Schadler1,2 e-mail: schadl@rpi.edu
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