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Viscometric determination of molecular weight of cellulose pulps in zinc ethylenediamine solution
Author(s) -
Saxena V. P.,
Bhatnagar H. L.,
Biswas A. B.
Publication year - 1963
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1963.070070116
Subject(s) - ethylenediamine , cellulose , zinc , pulp (tooth) , solvent , chemistry , molar mass distribution , polymer chemistry , nuclear chemistry , inorganic chemistry , organic chemistry , polymer , medicine , pathology
A 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 (0.25 M zinc 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 constants K = 5.85 × 10 −5 and a = 0.936 of the Mark‐Houwink equation [η] = K M n a , required for evaluating the molecular weight of cellulose pulps in ZED solution, have been determined by using the molecular weight values obtained from CED solutions.