Non‐Newtonian flow of dilute polymer solutions: II Solutions of cellulose nitrate in acetone

The method outlined in part I *) is applied to solutions of cellulose nitrate in acetone. It is found that the non‐Newtonian character of the flow is strongly dependent on the polymer concentrations, but does not persist at the limit of infinite dilution. In other words, the non‐Newtonian character of the flow is not an intrinsic property of the polymer molecule but results from molecular interactions. The concentrations were varied between 0.05 and 0.2 g/100 ml. In one series we went up to 0.8 g/100 ml. The highest gradient attained was about 5.104 sec−1.