Effect of a stabiliser on changes in the rheological properties of cellulose carbamate spinning solutions during their storage

The effect of urea used as stabiliser in various amounts on the stability o f rheological parameters of cellulose carbamate solutions during their stor age has been examined. It has been found that the addition of the stabilise r brings about no changes in the rheological character of cellulose carbama te spinning solutions. They remain non-Newtonian fluids thinned by shearing without a flow limit, but the solutions containing the stabiliser become m ore related to a Newtonian fluid. The additions of urea slows down the rate of gelation processes. A spinning solution containing 10% of urea practica lly retains its rheological properties for 48 h and one containing 20% of u rea even for 70 h from the moment of its preparation.