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| Paper IPM / P / 14366 |
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| Abstract: | |||||||
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Investigations of the elastic behavior of bulk elastomers have traditionally proceeded on the basis of
classical rubber elasticity, which regards chains as thermally fluctuating but disregards the thermal
fluctuations of the cross-links. Herein, we consider an incompressible and flat elastomer film of an
axisymmetric shape confined between two large hard co-planar substrates, with the axis of the film
perpendicular to the substrates. We address the impact that thermal fluctuations of the cross-links have
on the free energy of elastic deformation of the system, subject to the requirement that the fluctuating
elastomer cannot detach from the substrates. We examine the behavior of the deformation free energy
for one case where a rigid pinning boundary condition is applied to a class of elastic fluctuations at the
confining surfaces, and another case where the same elastic fluctuations are subjected to soft �??�??gluing�??�??
potentials. We find that there can be significant departures (both quantitative and qualitative) from the
prediction of classical rubber elasticity theory when elastic fluctuations are included. Finally, we compare
the character of the attractive part of the elastic fluctuation-induced, or pseudo-Casimir, stress with the
standard thermal Casimir stress in confined but non-elastomeric systems, finding the same power law
decay behavior when a rigid pinning boundary condition is applied; for the case of the gluing potential,
we find that the leading order correction to the attractive part of the fluctuation stress decays inversely
with the inter-substrate separation.
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