Fabrication of chemical resistant microchannels and measurement of tensile flow in semi-dilute polystyrene solutions
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In this study, using a Differential Pressure Extensional Rheometer (DPER), the extensional rate was maintained for a long time to measure the steady-state extensional rate in a wide range. Previously, in our laboratory, we measured the steady-state extensional viscosity of aqueous solutions of dilute and semi-dilute polyethylene oxide (PEO). However, it is necessary to study the extensional viscosity and finite extensible nonlinear elastic (FENE) constant of polystyrene dissolved in a non-polar solvent. In this study, a microfluidic device using a thermosetting resin with chemical resistance to organic solvents such as toluene was designed and fabricated. The PDMS channel, which is widely used in the existing microfluidics field, has limited use due to weak chemical resistance to organic solvents. The steady-state extensional viscosity of the polystyrene(PS)/toluene solution was measured using the prepared microfluidic channel.