高分子の流動抵抗計測と流体中の高分子形態のモデル化

抄録

Interaction between polymers and flows is related to a lot of characteristic flow behaviors such as drag reduction, elastic instability and lubrication etc. It is therefore necessary to quantify this interaction in order to better understand the characteristic flows. We begin this review by overviewing some previous works focusing on a tethered polymer conformation in flows. Several types of conformation such as unperturbed state，trumpet regime and stem-and-flower regime are derived by considering force balance between stokes drag due to polymer and elastic force of polymers. However, in the case of synthetic polymers, effects of flows on the polymer and its conformation in flows are not experimentally measured. Therefore, we have tried to measure drag force of synthetic polymers in flows to derive the interaction. We proposed a method to measure the drag force of methoxy polyethyleneglycol thiol（mPEG-SH） as a synthetic polymer in flowing fluids by using a scanning probe microscope （SPM）． The drag force of mPEG-SH was affected by the molecular weights of mPEG-SH and solute in the flows. To determine the drag force, we proposed a stem and ellipsoidal-flower model. The model was used to calculate the drag force by predicting the polymer conformation, which was reasonably close to the drag force measured by experiments.