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The chaos-to-order transition in critical modes of shearing for polymer and nanocomposite melts
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The chaos-to-order transition in critical modes of shearing for polymer and nanocomposite melts
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Journal Article
The chaos-to-order transition in critical modes of shearing for polymer and nanocomposite melts
2009
Overview
Two unusual experimental phenomena that were found for polymer melts or solutions containing the dispersed phases of Na-montmorillonite or detonation synthesis nanodiamond have been studied. These phenomena consist in the reduction of viscosity upon addition of specified amount of particles and in the formation of regular morphology by these particles in strong flows looking as a system of concentric rings. In other words, under certain conditions, there is transition to stratified shear stream and the viscosity of such a regular heterogeneous system canbe lower than that for the polymer matrix itself. Hence, both phenomena are mutually related; and the main problem here is the analysis of driving forces leading to the regular texture formation taking place in intense flows for unfilled viscoelastic polymers as well. As a preliminary explanation, the conception of the special kind of the elastic instability is discussed. This instability appears either in the regular helix-like structure formation or in the irregular elastic turbulence. The particles of the filler play a role of tracers that revealed the relief of texture.
Publisher
SP MAIK Nauka/Interperiodica,Springer Nature B.V
Subject
