Regarding the dependence of the viscosity properties of polyamidebenzimidazole solutions on its calculated mean molecular weight

Rheological studies of polyamidebenzimidazole (PABI) solutions with various calculated mean molecular weights (MWs) were carried out. A relationship was found between the ratio of the greatest Newtonian viscosity to the apparent viscosity and the calculated mean polymer MW. The effect of this characteristic on the rheological properties of spinning solutions and the strength of aramide fibers was determined. It was established that the strength characteristics of aramide fibers were higher if they were spun from PABI solutions with mean MW > 30,000.