Longitudinal growth of polymer crystals from flowing solutions. XI. The friction with the rotor surface

摘要

AbstractDuring the formation of ultrahigh modulus fibers by the “surface‐growth process,” the takeup stress is the main limiting factor lowering the attainable takeup speeds. This paper presents an investigation into the relative importance of the various factors contributing to takeup force and stress. Equations for force and stress have been derived which appear to agree with measurements. It has been concluded that the major part of the stress stems from the friction with the rotor surface and a smaller contribution arises from the coil deformation due to the flow. The equation for the stress has been employed to compute the maximum takeup