Thermodynamics of filled poly(methyl methacrylate)

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.

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Thermodynamics of filled poly(methyl methacrylate)

Cited by 3 publications

References 10 publications

The heat capacity of filled, amorphous polymers

The heat capacity of filled, amorphous polymers

Thermodynamics of statistical copolymers of n-octyl methacrylate and N-vinyl carbazole

Quantitative equivalence between polymer nanocomposites and thin polymer films

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