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A simple viscometric test for number average and weight average molecular weight of 12.6% N pyro nitrocellulose
Author(s) -
Bullock D. J.,
Cosgrove J. D.,
Head B. C.,
Lewis T. J.,
Marshall E. J.,
Wason D.,
Watson B. M.
Publication year - 1980
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.19800050502
Subject(s) - viscosity , nitrocellulose , osmotic pressure , chemistry , intrinsic viscosity , acetone , solvent , analytical chemistry (journal) , thermodynamics , chromatography , mathematics , physics , organic chemistry , biochemistry , membrane , polymer
In the poor solvent acetone/ethanol the viscosity of a 3% solution of 12.6% N pyro nitrocellulose is found to be related to the geometric mean of the number average and weight average molecular weights. The fractional increase in the viscosity of such a solution on the addition of lead ß‐resorcylate is a function only of number average molecular weight. Once calibration has been made against osmotic pressure measurements and intrinsic viscosity, both number and weight average may be measured rapidly with an accuracy which is no less than that of the osmotic pressure and intrinsic viscosity measurements themselves.