Abstract
Polymer solutions under shear flow are often observed in manufacturing processes. Classically, polymer behavior is represented by Kuhn’s bead-spring model, in which only the elongation of polymer chains is assumed. In recent years, the compression of polymer chains under shear flow has been reported. In this study, we investigated the behavior of polymer chains dissolved in various concentrations under shear flow. We measured the time variation of the fluorescence intensity emitted from a FRET (fluorescence resonance energy transfer) polymer, which enabled us to study the change in the distance between both ends of a polymer chain. The polymer chains appeared to stretch and compress depending on the concentration of the polymer solution. The results showed that the deformation of polymer chains was different from the classical theory. The FRET measurement is a promising diagnostic method for understanding the dynamics of polymer chains.
Highlights
Introduction under ShearSensors 2021, 21, 8033.The flow of a polymer solution has commonly appeared in synthetic and application processes for the manufacturing of various materials and fibers
When a polymer chain is in a steady-state flow, the hydrodynamic and elastic forces are in equilibrium
We investigated the response of polymer chains dissolved in various concentrations under shear induced by a Couette flow
Summary
The flow of a polymer solution has commonly appeared in synthetic and application processes for the manufacturing of various materials and fibers. This kind of flow is commonly found in fluid control and other microfabricated sensing technologies [1,2]. Concerning the dynamics of polymer molecules under shear, they are known to be modeled by Kuhn’s bead-spring model, which deforms as a function of the shear rate and the angle of the molecule with respect to the shear direction when hydrodynamic force is applied [3]. When a polymer chain is in a steady-state flow, the hydrodynamic and elastic forces are in equilibrium. The hydrodynamic force is assumed to be an elongational force acting on the polymer chain
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