Positive feedback driven by concentration fluctuations in asymmetrically photo-cross-linked polymer mixtures

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Abstract
Spatially coherent structures in the micrometer scales were observed in a binary polymer mixture photo-cross-linked in the miscible region. By following the reaction kinetics, it was found that these structures originated from a positive feedback loop driven by the concentration fluctuations associated with the reaction. The fact that this autocatalytic behavior depends strongly on the reaction kinetics suggests a solution to reconcile the two opposite viewpoints on the role of thermodynamics in formulating the time-dependent Ginzburg-Landau equation for chemically reacting polymer mixtures.

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