Viscometric determination of molecular weight of cellulose pulps in zinc ethylenediamine solution

摘要

AbstractA convenient method of preparing zinc ethylenediamine complex (ZED) solution for use as solvent for cellulose pulp is described, and the advantages in using this solvent (0.25Mzinc in 41 ethylenediamine in water) over cupriethylenediamine (CED) or cuprammonium solutions for viscometric determination of molecular weight of cellulose are indicated. Intrinsic viscosities of eight rayon‐grade pulp solutions have been determined at four temperatures: 15, 20, 25, and 30°C. The constantsK= 5.85 × 10−5anda= 0.936 of the Mark‐Houwink equation η =KM na, required for evaluating the molecular weight of cellulose pulps in ZED solution, have been determined by using the molecular weight values obtained from CED